Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations, 2023
Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations, 2023
No. CEA-PS-16/1/2021-CEI Division
Read full ActReport No.:
Date of Inspection:
Date of last inspection:
Name of the Inspecting Officer:
1. Name of the Mine:
2. Name of the Owner:
3. Name of the Agent:
4. Name of the Mine Manager:
5. Name of the Colliery Engineer:
6. Name of the Safety Officer:
7. Name of the designated Electrical Safety Officer:
8. Name of the Electrical Supervisor:
9. Name of the workman Inspector (Electrical):
10. Name of the Engineer (concerned Section):
11. Name of the working seam:
12. Working district Inspected:
13. Name of the persons accompanied during inspection:
14. Voltage and system of supply:
15. Particulars of the installations/ apparatus installed and their location as per mine plan:
16. Illumination level:
17. Percentage of methane/other explosive gas:
18. Dry bulb temperatu
(1) These regulations may be called the Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations, 2023.
(2) These regulations shall come into force on the date of publication in the Official Gazette.
(3) Scope and extent of application. — These regulations shall be applicable to electrical installation including electrical plant and electric line, and the person engaged in the generation or transmission or distribution or trading or supply or use of electricity.
(1) The generating company or licensee shall maintain records of the maps, plans and sections relating to supply or transmission of electricity in physical or digital form and provide the same to the Electrical Inspector for inspection as and when required.
(2) The Electrical Inspector shall supply a copy of the report of inspection referred to in sub-regulation (1), to the generating company or licensee, as the case may be.
Whenever a licence is granted by the Appropriate Commission, two sets of maps specifying the particular for which the licence is granted shall be signed and dated corresponding to the date of notification of the licence by an officer designated by the Appropriate Commission:
Provided that one set of maps shall be retained by the designated officer and the other set shall be furnished to the licensee.
(1) One or more electrical supervisors shall be appointed in writing by the owner, agent or manager of a mine or by the agent or the owner, of one or more wells in an oil-field to supervise the installation and such number of supervisors shall be on duty as per guidelines issued by Directorate General of Mines Safety from time to time under intimation in writing to the Authority or as directed by the Electrical Inspector of mines.
(2) The electrical supervisor so appointed shall be the person holding a valid Electrical Supervisor's Certificate of Competency, covering mining installations issued by the Appropriate Government.
(3) Adequate number of electricians as per guidelines issued by Directorate General of Mines Safety from time to time under intimation in writing to the Authority and or as directed by the Electrical Inspector of mines shall be appointed in writing by owner, agent or manager of a mine or by the owner or Agent of oil-field for carrying out
(1) The persons engaged for operation and maintenance of electrical installations in mines are required to undergo the type of training meant for the particular mining installations of Coal or Oil or Metal, training syllabus as issued by Directorate General of Mines Safety from time to time under intimation in writing to the Authority.
(2) The owner or manager or agent of the mine shall arrange for training of their personnel engaged in the operation and maintenance of electrical installations of mines in his own institute or any other institute recognized by the Central Government or State Government.
(3) The refresher training shall be imparted at a periodicity of intervals not more than two years. A register or in electronic form by the Owner or Manager or Agent of a mine or by the owner or agent, of one or more wells in an oil-fields of the mine shall be maintained wherein the names of the persons trained, due date of refresher training and the like shall
The regulations under this chapter shall be applicable to renewable generating stations which shall be in addition to the regulations provided from chapter I to VII.
(1) Every person who is granted a licence shall, within thirty days of the grant thereof, have physical or digital copies of the licence and maps showing the area of supply as specified in the licence to exhibit the same for public inspection at all reasonable times at its head office, local offices, if any, and at the office of every local authority within the area of supply.
(2) Every such licensee shall, within the aforesaid period of thirty days, supply free of charge one copy of the licence along with the relevant maps to every local authority within the area of supply and shall also make necessary arrangements for the sale of physical or digital copies of the licence and maps to all persons applying for the same, at a price to be notified by the Appropriate Government from time to time.
All biomass plants and waste to energy plants including Municipal solid waste or refuse derived fuel shall comply with the safety standards as mentioned in Regulations notified by the Authority under clause (e) of sub-section (2) of section 177 of the Act.
(1) The following general safety requirement for solar installations shall be ensured, namely: —
(i) clear pathways of minimum seventy five centimetre in width with hand rails for roof access and emergency exit shall be provided for roof top system;
(ii) there shall be clear pathways, walkways between the rows or columns of solar panels which is necessary for cleaning and maintenance;
(iii) cables shall be laid in trenches for ground based photovoltaic installation;
(iv) ground mounted solar installations shall be protected by fencing or other means not less than 1.8 metre in height so as to prevent unauthorised entry;
(v) disconnection switches or circuit breakers provided in combiner boxes to disconnect the photovoltaic system from all other conductors of the system shall be located at a readily accessible location;
(vi) three phases
(1) All wind energy generation systems including wind turbines, wind power plants onshore and offshore connected with the grid shall be as per relevant standards.
(2) Transformers for wind turbine applications shall be as per the relevant standards.
(3) Portable fire extinguishers shall also be kept at various locations in plants to take immediate action in case of fire.
(4) Any wind turbine workers exposed to a potential fall shall be supported by a certified fall arrest system such as a full body safety harness.
The regulations under this chapter shall be applicable to electric vehicle charging stations which shall be in addition to the regulations provided from chapter I to VII.
(1) Electric vehicle charging stations shall be provided with separate protection against the overload of input supply and output supply as per relevant standards.
(2) Socket-outlet of supply of electric vehicle charging points shall be installed at least 800 millimetre above the finished ground level.
(3) A cord extension set or second supply lead shall not be used in addition to the supply lead for the connection of the electric vehicle to the charging point and shall not be used as a cord extension set.
(4) No adaptor shall be used to connect a vehicle connector to a vehicle inlet.
(5) The distance between the charging point and the connection on the electric vehicle shall not be more than five metre during charging.
(6) The portable socket outlets shall not be permitted for electric vehicle charging.
(7) The lightning protection system shall be provided for the electric vehicle charging stations as per relevant standards.
(8
(1) Each electric vehicle charging points shall be supplied individually by a dedicated sub-circuit protected by an overcurrent protective device complying with the relevant standards and the overcurrent protective device shall be part of a switchboard.
(2) Co-ordination of all protective devices in the charging stations shall be ensured.
(3) All electric vehicle charging stations shall be provided with an earth continuity monitoring system that disconnects the supply in the event of the earthing connection to the vehicle becomes ineffective.
(4) The charging lead shall be fitted with an earth-connected metal shielding and the cable insulation shall be wear resistant and maintain flexibility over the operating temperature range.
(5) A protective earth conductor shall be provided to establish an equipotential connection between the earth terminal of the supply and the conductive parts of the vehicle which shall be as per the relevant standards.
(1) The enclosure of electric vehicle supply equipment shall be made of fire retardant material with self-extinguishing property and free from halogen.
(2) The fire detection, alarm and control system shall be provided as per relevant standards.
The owner of the charging station shall ensure that the tests as specified in the manufacturer’s instructions for the residual current devices and the charging station have been carried out.
(1) The owner of the charging station shall keep records of design, construction and labelling to be compatible with a supply of standard voltage at a nominal frequency of 50 Hz of the charging station.
(2) The owner of the charging station shall keep records of the relevant test certificates as indicated in these regulations and as per the relevant standards.
(3) The owner of the charging station shall keep records of the results of every inspection, testing and periodic assessment and details of any issues observed during the assessment and any actions required to be taken in relation to those issues.
(4) The owner of the charging station shall retain a copy of all records, as specified in sub-regulation (1), (2) and (3) of above, either in hard form or in electronic form, for at least seven years and shall provide a copy of the records to the officials during the inspection.
The regulations under this chapter shall be applicable to high voltage direct current which shall be in addition to the regulations provided from chapter I to VII.
(1) The licensee shall, after commencing supply of electricity, forthwith cause a plan, to be made in physical or digital form, of the area of supply, and shall cause to be marked thereon the alignment and in the case of underground works, the approximate depth below the surface of all the existing electric supply lines, street distribution boxes and other works, and shall once in every year cause that plan to be duly corrected so as to show the electric supply lines, street distribution boxes and other works for the time being in position and shall also made sections showing the approximate level of all his existing underground works other than service lines.
(2) Every plan shall be drawn to such horizontal and vertical scale as the Appropriate Commission may require:
Provided that no scale shall be required unless maps of the locality on that scale are for the time being available to the public.
(3) Every plan and section so made or c
(1) A wire mesh shall be provided beneath the walk way; wherever constructed above the hanging valves in the valve hall.
(2) Cables used for sensitive measurements shall be laid in separate and completely screened or covered channels or galvanised steel pipes.
(3) A separate emergency source of illumination with automatic initiation shall be provided in every room or compartment of high voltage direct current station.
(4) No oil immersed apparatus shall be kept within the valve hall.
(5) All doors of compartments containing modules equipped with laser diodes and junction boxes of the fibre optic cables shall be locked and marked with laser warning symbols.
(1) Alternating Current and Direct Current filter banks area shall be efficiently protected by fencing or other means, not less than 1.8 metre in height, so as to prevent access to the conductors and apparatus therein by any unauthorised person and the fencing of such area shall be effectively earthed.
(2) The gate of fencing and earth switch of the filter bank shall be interlocked such that the gate can be opened only after the disconnection and discharging of the filter bank completely.
(3) The air core smoothing reactor shall be fenced all around and the fence shall not fall in the Magnetic Clearance Contour of the smoothing reactor.
(4) Common neutral bus in Alternating Current filters shall be earthed at one point only.
(1) Converter transformer shall be provided with separate perimeter earthing conductor.
(2) The line side neutral of the converter transformer bank shall be earthed at one point only.
(3) Every part of support structure circumference of the air cored reactor shall be earthed in a manner such that it is not forming closed loops.
(4) Radio Frequency Interference screen of valve hall shall be electrically connected and effectively earthed.
(5) Metallic sheet, prefabricated structure members and trusses housing high voltage direct current apparatus shall be electrically connected and effectively earthed.
(6) Insulating pads or sleeves shall be provided between the steel reinforcement components, in foundation beneath the smoothing reactor, wherever they are crossing each other.
The regulations under this chapter shall be applicable to gas insulated substation which shall be in addition to the regulations provided from chapter I to VII.
(1) A separate emergency source of illumination with automatic initiation shall be provided in every room or compartment of gas insulated substation.
(2) Cable cover protection unit shall be provided between flanges of gas insulated substation and cable termination unit.
(3) Gas insulated substation installation of 220 kV and above voltage shall be provided with partial discharge monitoring system.
(4) SF6 gas leakage rate from any single compartment of gas insulated substation to atmosphere and between compartments shall not exceed as stipulated in the relevant standards.
(1) Enclosure of gas insulated substation bay shall be earthed for high frequency transient voltage as per original equipment manufacturer recommendations, apart from the regular earthing.
(2) Earthing of gas insulated substation installation shall be as per relevant standards.
(3) Travelling wave energy generated inside the gas insulated substation due to switching operations shall be diverted to the earth by providing effective earthing from bushing shroud to the earth.
(1) The Central Government or the State Government, as the case may be, by an order in writing, allow deviations in respect of matters referred in these regulations except regulation 32.
(2) The Electrical Inspector or the Electrical Inspector of mines may, by an order in writing, and reasons to be recorded allow deviation in respect of matters referred in regulations 14 to 19, regulation 30, sub-regulations (2), (3) and (5) of regulation 37, sub-regulation (3) of regulation 38, clauses (i) to (iv) of regulation 39, clause (xii) of regulation 43, regulation 45, sub-regulation (2) of regulation 46, regulations 48, regulations 54 to 56, regulations 59 to 63, regulation 67, regulation 74, regulation 77, regulations 81 to 94, regulation 104, sub- regulations (6), (8) and (10) of regulation 109, regulation 116 and regulations 119 to 135 on case to case basis.
Explanation. — Every order allowing the deviations by the Electrical Inspector or the Ele
(1) All electric supply lines and apparatus shall be of sufficient rating for power, insulation and estimated fault current and of sufficient mechanical strength, for the duty cycle which they may be required to perform under the environmental conditions of installation, and shall be constructed, installed, protected, worked and maintained in such a manner as to ensure safety of human beings, animals and property.
(2) Save as otherwise provided in these regulations, the relevant standards including National Electrical Code and National Building Code shall be followed to carry out the purpose of these regulations and where relevant Indian standards are not available, International standards shall be followed and in the event of any inconsistency, the provisions of these regulations shall prevail.
(3) The material and apparatus used shall conform to the relevant standards.
(4) All electrical equipment shall be installed above the Highest Flood Level and w
(1) The supplier shall ensure that all electric supply lines, wires, fittings and apparatus belonging to him or under his control, up to the point of commencement of supply, which are on a consumer’s premises, are in a safe-condition and in all respects fit for supplying electricity and the supplier shall take precautions to avoid danger arising on such premises from such supply lines, wires, fittings and apparatus.
(2) The service lines placed by the supplier on the premises of a consumer which are underground or which are accessible shall be so insulated and protected by the supplier as to be secured under all ordinary conditions against electrical, mechanical, chemical or other injury to the insulation.
(3) The consumer shall, as far as circumstances permit, take precautions for the safe custody of the equipment on his premises belonging to the supplier.
(4) The consumer shall also ensure that the installation of the licensee under his control is kep
(1) The supplier shall provide a suitable switchgear in each conductor of every service line other than an earthed or earthed neutral conductor or the earthed external conductor of a concentric cable within a consumer’s premises, in an accessible position and such switchgear shall be contained within an adequately enclosed fireproof receptacle:
Provided that where more than one consumer is supplied through a common service line, each such consumer shall be provided with an independent switchgear at the point of rigid junction to the common service.
(2) Every electric supply line other than the earthed or earthed neutral conductor of any system or the earthed external conductor of a concentric cable shall be protected by a suitable switchgear by its owner.
Where the conductors include an earthed conductor of a two-wire system or an earthed neutral conductor of a multi-wire system or a conductor which is to be connected thereto, the following conditions shall be complied with, -
(i) an indication of a permanent nature shall be provided by the owner of the earthed or earthed neutral conductor, or the conductor which is to be connected thereto, to enable such conductor to be distinguished from any live conductor and such indication shall be provided as per relevant standards, namely: —
(a) where the earthed or earthed neutral conductor is the property of the supplier, at or near the point of commencement of supply;
(b) where a conductor forming part of a consumer’s system is to be connected to the supplier’s earthed or earthed neutral conductor, at the point where such connection is to be made; and
(c) in all other cases, at a point co
(1) The supplier shall provide and maintain on the consumer’s premises for the consumer’s use, a suitable earthed terminal in an accessible position at or near the point of commencement of supply as per relevant standards:
Provided that in the case of installation of voltage exceeding 250 V the consumer shall, in addition to the aforementioned earthing arrangement, provide his own earthing system with an independent electrode and the same shall be interlinked with the earthed terminal mentioned in sub-regulation (1) through a suitable link.
(2) The consumer shall take all reasonable precautions to prevent mechanical damage to the earthed terminal and its lead belonging to the supplier.
Where bare conductors are used in a building, the owner of such conductors shall, -
(a) ensure that they are inaccessible to general public;
(b) provide in readily accessible position switches for rendering them dead whenever necessary; and
(c) take such other safety measures as are specified in the relevant standards.
(1) In these regulations, unless the context otherwise requires,
(a) “Act” means the Electricity Act, 2003 (36 of 2003);
(b) “accessible” means within physical reach without the use of any appliance or special effort;
(c) “aerial bunched cable” means polyethylene or cross linked polyethylene insulated cable having three or four cores with aluminium conductors twisted over a central bare or insulated aluminium alloy or steel messenger wire;
(d) “apparatus” means electrical apparatus and includes all machines, fittings, accessories and appliances in which conductors are used;
(e) “bare” means not covered with insulating materials;
(f) “bonding conductor” means the inter connecting conductors for the purpose of equipotential bonding with the main earth;
(g) “cable” means a length of insulated single conductor, solid
The owner of every installation of voltage exceeding 250 V shall affix permanently in a conspicuous position a danger notice in Hindi or English and the local language of the district, with a sign of skull and bones of a design as per relevant standards on, -
(a) every motor, generator, transformer and other electrical plant and equipment together with apparatus used for controlling or regulating the same;
(b) all supports of overhead lines of voltage exceeding 650 V which can be easily climbed upon without the aid of ladder or special appliances; and
(c) luminous tube sign requiring supply, X-ray and similar high frequency installations of voltage exceeding 650 V but not exceeding 33 kV:
Provided that where it is not possible to affix such notices on any generator, motor, transformer or other apparatus, they shall be affixed as near as possible thereto, or the word ‘danger’ and t
(1) Before any conductor or apparatus is handled, adequate precautions shall be taken, by earthing or other suitable means, to discharge electrically such conductor or apparatus, and any adjacent conductor or apparatus if there is danger therefrom, and to prevent any conductor or apparatus from being accidentally or inadvertently electrically charged when persons are working thereon shall be followed as per the relevant standards.
(2) Every person who is working on an electric supply line or apparatus or both shall be provided with, —
(a) personal protective equipment, tools and devices such as rubber gloves and safety footwear suitable for working voltage, safety belts for working at height, nonconductive ladder, earthing devices of appropriate class, helmet, line tester, hand lines, voltage detector and hand tools as per the relevant standards; and
(b) any other device for protecting him from mechanical and electrical
Every person owning a vehicle, travelling crane, or the like to which electricity is supplied from an external source shall ensure that it is efficiently controlled by a suitable switch enabling all voltage to be cut off in one operation and, where such vehicle, travelling crane or the like runs on metal rails, the owner shall ensure that the rails are electrically continuous and earthed at multiple points to ensure equipotential.
(1) Flexible cables shall not be used for portable or transportable motors, generators, transformers, rectifiers, electric drills, electric sprayers, welding sets or any other portable or transportable apparatus unless they are insulated for required voltage as per the relevant standards and adequately protected from mechanical damage.
(2) Where the protection is by means of metallic covering, the covering shall be in metallic connection with the frame of any such apparatus and earthed.
(3) The cables shall be three core type and four core type for portable and transportable apparatus working on single phase and three phase supply, respectively and the core meant to be used for earth connection shall be easily identifiable.
(1) Where the supplier or the owner has brought into use an electric supply line, other than an overhead line, which is not completely enclosed in a continuous metallic covering connected with earth and is insulated or protected in situ by composition or material of a bituminous character, —
(i) any pipe, conduit, or the like into which such electric supply line may have been drawn or placed shall, unless other arrangements are approved by the Electrical Inspector in any particular case, be effectively sealed at its point of entry into any street box so as to prevent any flow of gas to or from the street box; and
(ii) such electric supply line shall be periodically inspected and tested where accessible, and the result of each such inspection and test shall be duly recorded by the supplier or the owner.
(2) The supplier or the owner shall not bring into use any further electric supply line as aforesaid which is insulated
(1) Street boxes shall not contain gas pipes, and precautions shall be taken to prevent, any influx of water or gas.
(2) Where electric supply lines forming part of different systems pass through the same street box, they shall be readily distinguishable from one another and all electric supply lines at or in street boxes shall be adequately supported and protected so as to prevent risk of damage to or danger from adjacent electric supply lines.
(3) All street boxes shall be regularly inspected for the purpose of detecting the presence of gas and if any influx or accumulation is discovered, the owner shall give immediate notice to the agency or company owning gas pipeline in the neighborhood of the street box and in cases where a street box is large enough to admit the entrance of a person therein have been placed in position, provision shall be made, -
(i) to ensure that any gas which may by accident have obtained access to the box sha
The owner of every generating station, substation, junction box or pillar box in which there are any circuits or apparatus, whether intended for operation at different voltages or at the same voltage, shall ensure by means of indication of a permanent nature that the respective circuits are readily distinguishable from each other.
The owner of every installation including substation, double pole structure, four pole structure or any other structure having more than one feed, shall ensure by means of indication of a permanent nature, that the installation is readily distinguishable from other installations.
(1) The owners of all circuits and apparatus shall so arrange them that there shall be no danger of any part thereof becoming accidentally charged to any voltage beyond the limits of voltage for which they are intended.
(2) Where alternating current and direct current circuits are installed on the same box or support, they shall be so arranged and protected that they shall not come into contact with each other.
(1) Fire buckets filled with clean dry sand and ready for immediate use for extinguishing fires, in addition to fire extinguishers suitable for dealing with fires, shall be conspicuously marked and kept in all generating stations, enclosed substations and enclosed switching-stations in convenient location.
(2) Appropriate type of fire extinguisher conforming to the relevant standards, shall be installed, maintained, periodically inspected and tested as per the relevant standards for extinguishing and controlling fire and record of such tests shall be maintained.
(3) Sufficient number of first-aid boxes or cupboards conspicuously marked and equipped with such contents as the State Government may specify or as per the relevant standards, shall be provided and maintained at
(1) The supplier or consumer, or owner of electrical installation, owner or agent or manager of a mine, or agent of any company operating in an oil-field or owner of a drilled well in an oil-field or a contractor who has entered into a contract with a supplier or a consumer, or owner of electrical installation, owner or agent or manager of a mine, or agent of any company operating in an oil-field or owner of a drilled well in an oil-field to carry out duties incidental to the generation, transformation, transmission, conversion, distribution or use of electricity shall designate person for the purpose to operate and carry out the work on electrical lines and apparatus.
(2) The supplier or consumer, or owner or agent or manager of a mine, or agent of any company operating in an oil-field or the owner of a drilled well in an oil-field or a contractor referred to in sub-regulation (1) shall maintain a record, in paper or electronic form, wherein the names of the desig
(1) Upon receipt of an application for a new or additional supply of electricity and before commencement of supply or recommencement of supply after the supply has been disconnected for a period of six months, the supplier shall either test the installation himself or accept the test results submitted by the consumer when same has been duly signed by the licenced electrical contractor:
Provided that in case of voltage level equal to or below the notified voltage, Chartered Electrical Safety Engineer can also test the installation on request of owner.
(2) The testing and verifications shall be carried out as per relevant standards.
(3) The testing equipment shall be calibrated by a Government authorised or National Accreditation Board for Testing and Calibration Laboratories accredited laboratory at periodical interval as per the periodicity specified by them.
(4) The supplier shall maintain a record of test results obtained at eac
The capacity above which generating units including generating units producing electricity from renewable sources of energy shall be required to be inspected by the Electrical Inspector before commissioning, shall be as per the notification issued by the Appropriate Government in this regard.
(1) The record maintained under sub-regulation (2) of regulation 3 shall be produced before the Electrical Inspector as and when required.
(2) If on inspection, the Electrical Inspector finds that the designated person does not comply with sub-regulation (3) of regulation 3, he shall recommend the removal of the name of such person from the record.
(1) All suppliers of electricity including generating companies, transmission companies and distribution companies shall designate an Electrical Safety Officer for ensuring observance of safety measures specified under these regulations in their organisation for construction, operation and maintenance of electrical system of all generating stations, transmission lines, substations, distribution systems and supply lines.
(2) The Electrical Safety Officer shall possess a degree in Electrical Engineering with at least five years experience in operation and maintenance of electrical installations or a Diploma in Electrical Engineering with at least ten years experience in operation and maintenance of electrical installations:
Provided that the Electrical Safety Officer designated for mines shall possess educational qualification as mentioned in sub-regulation (2) with at least five years of experience in operation and maintenance of electrical in
(1) The entire switchyard or substation equipment and buildings including all non-current carrying metal parts associated with an installation shall be effectively earthed to an earthing system or mat which shall, —
(i) limit the touch and step potential to tolerable values as per relevant standards;
(ii) limit the earth potential rise to tolerable values as per relevant standards, so as to prevent danger due to transfer of potential through ground, earth wires, cable sheath, fences, pipe lines or other such equipment; and
(iii) maintain the resistance of the earth connection to such a value as to make operation of the protective device effective.
(2) In the case of star connected system with earthed neutrals or delta connected system with earthed artificial neutral point,-
(i) the neutral point of every generator and transformer shall be earthed by connecting it to the eart
Where electricity of voltage exceeding 650 V is transformed, converted, regulated or otherwise controlled in substations or switching stations including outdoor substations and outdoor switching stations or in street boxes constructed underground, the following provisions shall be ensured, namely: —
(i) substations and switching stations shall preferably be erected above ground, but where necessarily constructed underground due provisions for ventilation and drainage shall be made and any space housing switchgear shall not be used for storage of any materials especially inflammable and combustible materials or refuse; and
(ii) (a) outdoor substations except pole type substations and outdoor switching stations shall, unless the apparatus is completely enclosed in a metal covering connected with earth, the said apparatus also being connected with the system by armoured cables, be protected by fencing not less than 1.8 metre in
Where platform type construction is used for a pole type substation and sufficient space for a person to stand on the platform is provided, a proper hand rail shall be built around the platform and if the hand rail is of metal, it shall be connected with the earth:
Provided that in the case of pole type substation on wooden supports and wooden platform, the metal hand rail shall not be connected with the earth.
Suitable arrangement shall be made for immediate and automatic or manual discharge of every static condenser on disconnection of supply.
(1) Any person who proposes to use or who is using electricity for the purpose of operating a luminous tube sign installation, or who proposes to transform or is transforming electricity to a voltage exceeding 650 V but not exceeding 33 kV for any such purpose shall comply with the following conditions, namely: —
(i) all live parts of the installation, including all apparatus and live conductors in the secondary circuit, but excluding the tubes except in the neighbourhood of their terminals, shall be inaccessible to undesignated persons and such parts shall be effectively screened;
(ii) irrespective of the method of obtaining the voltage of the circuit which feeds the luminous discharge tube sign, no part of any conductor of such circuit shall be in metallic connection, except in respect of its connection with earth, with any conductor of the supply system or with the primary winding of the transformer,
(1) Where a system having a point connected with earth is used for supply of electricity to an electrode boiler of voltage exceeding 650 V which is also connected with earth, the owner or user of electrode boiler shall comply with the following conditions, namely: —
(i) the metal work of the electrode boiler shall be efficiently connected to the metal sheathing and metallic armouring, if any, of the electric supply line of voltage exceeding 650 V but not exceeding 33 kV whereby electricity is supplied to the electrode boiler;
(ii) the supply of electricity at voltage exceeding 650 V to the electrode boiler shall be controlled by a suitable circuit-breaker so set as to operate in the event of the phase currents becoming unbalanced to the extent of ten per cent of the rated current consumption of the electrode boiler under normal conditions of operation:
Provided that if in any case a higher setting is es
(1) Any person, who proposes to use or who is using electricity for the purpose of operating an X-ray or similar high-frequency installation, other than portable units or shock-proof self contained and stationary units shall comply the following conditions, namely: —
(i) mechanical barriers shall be provided to prevent too close an approach to any parts of the X-ray apparatus of voltage exceeding 650 V but not exceeding 33 kV, except the X-ray tube and its leads, unless such parts of voltage exceeding 650 V but not exceeding 33 kV have been rendered shock proof by being shielded by earthed metal or adequate insulating material;
(ii) where generators operating at 300 kV peak or more are used, such generators shall be installed in rooms separate from those containing the other equipment and any step-up transformer employed shall be so installed and protected as to prevent danger;
(iii) a suitable switch s
(1) All conductors of overhead lines other than those provided in regulation 70 shall have a breaking strength of not less than 350 kgf.
(2) Where the voltage does not exceed 250 V and the span is less than fifteen metre and is drawn through the owner’s or consumer’s premises, a conductor having an actual breaking strength of not less than 150 kgf may be used.
(1) No conductor or earthwire of an overhead line shall have more than one joint in a span: Provided that there shall be no joints in the conductor or earthwire in a span of crossing over the highways, expressways and railway lines.
(2) The joint between conductors or earthwires of overhead lines shall be mechanically and electrically secured under the conditions of operation and the ultimate strength and the electrical conductivity of the joint shall be as per relevant standards.
(1) The load and permissible stresses on the structural members, conductors and earth wire of self supporting steel lattice towers or steel monopole towers for overhead transmission lines shall be as per relevant standards.
(2) Overhead lines not covered in sub-regulation (1) shall have the minimum factors of safety as per the table given below:-
:
| Description | Minimum Factor of Safety |
|---|---|
| Metal Supports | 1.5 |
| Mechanically Processed Concrete Supports | 2.0 |
| Hand-Moulded Concrete Supports | 2.5 |
| Wood Supports | 3.0 |
(3) The minimum factor of safety shall be based on such load as may cause failure of the support to perform its function, assuming that the foundation and other components of the structure are intact.
(4) The load shall be equivalent to the yield point stress or the modulus of rupture
(1) The Appropriate Government shall authorise Chartered Electrical Safety Engineer from amongst persons having the qualification and experience as per the guidelines issued by the Authority to assist the owner or supplier or consumer of electrical installations for the purpose of self- certification under regulation 32 and regulation 45 of these regulations.
(2) The Appropriate Government shall upload the name of the Chartered Electrical Safety Engineer, as soon as any person is authorised as Chartered Electrical Safety Engineer, on the web portal of the Government or the Department dealing with matters of inspection of electrical installations for the information of the owner or supplier or consumer.
(1) The minimum clearance above ground and across road surface of National Highway or Expressway or State Highway or other road or highest traction conductor of railway corridor or navigational or non-navigational river of the lowest conductor of an alternating current overhead line, including service lines, of nominal voltage shall have the values specified in Schedule VIII A.
(2) The minimum clearances regarding high voltage direct current line shall be as per Schedule VIII B.
(3) In case of Electric lines of 33 kV and below passing through the protected areas (National Parks, Wildlife Sanctuaries, Conservation Reserves, Community Reserves), Eco-sensitive zones around the protected areas and Wildlife Corridors, only underground cable shall be used.
(4) No tower footing or structure of an overhead line of voltage 33 kV or above or high voltage direct current, shall be closer than twenty five metre from the edge of the right of way of a Petroleum or Nat
(1) No conductor of an overhead line crossing a tramway or trolley bus route using trolley wires shall have less than the following clearances above any trolley wire, namely: —
(i) lines of voltage not exceeding 650 V - 1.2 metre:
Provided that where an insulated conductor suspended from a bearer wire crosses over a trolley wire the minimum clearance for such insulated conductor shall be 0.6 metre.
(ii) lines of voltage exceeding 650 V up to and including 11000 V - 1.8 metre;
(iii) lines of voltage exceeding 11000 V but not exceeding 33000 V - 2.5 metre;
(iv) lines of voltage exceeding 33 kV - 3.0 metre.
(2) In any case of a crossing specified in sub-regulation (1), whoever lays his overhead line later, shall provide the clearance between his own overhead line and the overhead line which will be crossed in accordance with the provisions of the sub-regu
(1) An overhead line shall not cross over an existing building as far as possible and no building shall be constructed under an existing overhead line.
(2) Where an overhead line of voltage not exceeding 650 V passes above or adjacent to or terminates on any building, the following minimum clearances from any accessible point, on the basis of maximum sag, shall be observed, namely: —
(i) for any flat roof, open balcony, varandah roof and lean-to-roof, -
(a) when the line passes above the building, a vertical clearance of 2.5 metre from the highest point; and
(b) when the line passes adjacent to the building, a horizontal clearance of 1.2 metre from the nearest point;
(ii) for pitched roof,
(a) when the line passes above the building, a vertical elearance of 2.5 metre immediately under the line; and
(b) when the line passes adjace
(1) An overhead line shall not cross over an existing building as far as possible and no building shall be constructed under an existing overhead line.
(2) Where an overhead line of voltage exceeding 650 V passes above or adjacent to any building or part of a building it shall have on the basis of maximum sag a vertical clearance above the highest part of the building immediately under such line, of not less than, —
(i) for lines of voltages exceeding 650 V and up to and including 33 kV - 3.7 metre;
(ii) for lines of voltages exceeding 33 kV - 3.7 metre plus 0.30 metre for every additional 33 kV or part thereof.
(3) The horizontal clearance between the nearest conductor and any part of such building shall, on the basis of maximum deflection due to wind pressure, be not less than, —
(i) for lines of voltages exceeding 650 V and up to and including 11 kV - 1.2 metre;
(i
Where conductors of different voltages are laid on the same supports, the owner shall make adequate provision to guard against danger to linemen and others, from the lower voltage system being charged above its nominal voltage, by leakage from or contact with the higher voltage and the methods of construction and the applicable minimum clearances between the conductors of the two systems shall be as provided in regulation 71.
(1) If at any time subsequent to the erection of an overhead line, whether covered with insulating material or not or underground cable, any person proposes to erect a new building or structure or flood bank or to raise any road level or to carry out any other type of work whether permanent or temporary or to make in or upon any building, or structure or flood bank or road, any permanent or temporary addition or alteration, such person and the contractor whom he employs to carry out the erection, addition or alteration, shall give intimation in writing of his intention to do so, to the supplier or owner and to the Electrical Inspector and shall furnish therewith a scale drawing showing the proposed building, structure, flood bank, road or any addition or alteration and scaffolding thereof required during the construction.
(2) On receipt of such intimation, the supplier or owner shall examine,-
(a) whether the overhead line or underground cabl
(1) No rods, pipes or similar materials shall be taken below, or in the vicinity of any bare overhead conductors or lines:
Provided that if these materials contravene the regulations 62 and 63, such materials shall be transported under the direct supervision of a person designated or appointed or engaged or permitted under these regulations.
(2) No rods, pipes or other similar materials shall be brought within the flash over distance of bare live conductors or overhead lines.
(3) No material or earth work or agricultural produce shall be dumped or stored, no trees grown below or in the vicinity of bare overhead conductors or lines in contravention to the regulations 62 and 63.
(4) No flammable material shall be stored under the electric line.
(5) No fire shall be allowed below overhead lines and above the demarcated underground cables.
(1) For the purpose of computing the vertical clearance of an overhead line, the maximum sag of any conductor shall be calculated on the basis of the maximum sag in still air and the maximum temperature as specified under regulation 59 and computing any horizontal clearance of an overhead line the maximum deflection of any conductor shall be calculated on the basis of the wind pressure specified under regulation 59.
(2) No blasting for any purpose shall be done within three hundred metre from the boundary of a substation or from the electric supply lines of voltage exceeding 650 V or tower structure thereof without the written permission of the owner of such substation or electric supply lines or tower structures; and in case of mining lease hold area, without the written permission of the Electrical Inspector of mines.
(3) No cutting of soil within ten metre from the tower structure of 110 kV and above voltage level shall be permitted without the written per
Overhead lines shall not be laid in the vicinity of airport or aerodromes unless the Airport Authorities or concerned defence authorities have approved in writing the route of the proposed overhead lines as per relevant standards.
All conductors shall be attached to supports at intervals not exceeding the safe limits based on the ultimate tensile strength of the conductor and the factor of safety specified under regulation 59:
Provided that in the case of overhead lines carrying conductors of voltage not exceeding 650 V when laid over, along or across any street, the interval shall not, without the consent in writing of the Electrical Inspector, exceed sixty five metre.
(1) The Engineers and Supervisors engaged or appointed to operate or undertake maintenance of any part or whole of a generating station shall hold degree or diploma in Engineering relevant to the electrical installations from a recognised institute or university.
(2) The Engineers and Supervisors engaged or appointed for operation and maintenance of generating station shall have successfully undergone the type of training as specified by the Authority in its guidelines issued under sub-regulation (4) from time to time, within two years from the date of engagement or appointment.
(3) The Technicians to assist Engineers or Supervisors shall possess a certificate in appropriate trade, preferably with a two years course from an Industrial Training Institute recognised by the Central Government or the State Government and shall have successfully undergone the type of training as specified in sub-regulation (4), within two years from the date of engagement or appoi
(1) Every overhead telecommunication line laid on supports of an electric line shall consist of conductors each having a breaking strength of not less than 270 kgf.
(2) Every telecommunication line laid on supports of an electric line shall be protected against lightning as per relevant standards.
(3) Where a telecommunication line is laid on supports of an electric line of voltage exceeding 650 V, a suitable arrangement shall be made to safeguard any person against injury resulting from contact, leakage or induction between such electric and telecommunication lines.
Where an overhead line crosses or is in proximity to any telecommunication line, the owner of the overhead line or the telecommunication line, whosoever lays his line later, shall arrange to provide for protective devices or guarding arrangement as per code of practice or guidelines issued by Power and Telecommunication Coordination Committee and shall observe the following provisions, namely: —
(i) when it is intended to lay a telecommunication line or an overhead line which will cross or be in proximity to an overhead line or a telecommunication line, as the case may be, the person proposing to lay such line shall give one month notice of his intention so to do along with the relevant details of protection and drawings to the owner of the existing line;
(ii) guarding arrangement shall be provided where a line of voltage not exceeding 33 kV crosses a road or street or telecommunication line;
(iii) wher
(1) Where guarding arrangement is required under these regulations, the following shall be observed, namely: —
(i) every guard wire shall be connected with the earth at each point at which its electrical continuity is broken;
(ii) every guard wire shall have an actual breaking strength of not less than 635 kgf and if made of iron or steel, shall be galvanised; and
(iii) every guard wire or cross-connected system of guard wires shall have sufficient current carrying capacity to ensure them rendering dead, without risk of fusing of the guard wire, till the contact of any live wire has been removed.
(2) In the case of a line crossing over a trolley wire, the guarding arrangement shall be subjected to the following conditions, namely: -
(i) where there is only one trolley-wire, two guard-wires shall be provided as illustrated in DIAGRAM-A;
(ii) where there
No service line or tapping shall be taken off an overhead line except at a point of support:
Provided that the number of tappings per conductor shall not be more than six in case of connections at voltage not exceeding 650 V.
(1) Earthing of support of overhead lines up to 33 kV shall be provided as under, namely: —
(a) all metal supports and all reinforced and pre-stressed cement concrete supports of overhead lines and metallic fittings attached thereto, shall be permanently and effectively earthed by providing a continuous earth wire and securely fastened to each pole and connected with the earth at each support and the metallic fittings attached thereto shall also be permanently and effectively earthed;
(b) metal cross arms and insulator pins for Plain Cement Concrete and Pre-Stressed Cement Concrete poles shall be bonded together and normally earthed at every pole;
(c) for locations involving railways, electric line crossings and special structures, pipe or rod type earthing shall be provided;
(d) all steel poles on which switches, transformers, fuses are mounted shall be earthed:
Explanation. — For the purposes of this regulation, rails, reinforced cement concrete poles and pre-stressed cement concrete poles without steps, tubular poles, wooden supports without steps, I-sections and channels shall be deemed as supports which cannot be easily climbed upon.
(1) Every overhead line which is not being suspended from a dead bearer wire, not being covered with insulating material and not being a trolley-wire, is laid over any part of a street or other public place or in any factory or mine or on any consumer’s premises shall be protected with earth guarding for rendering the line electrically harmless in case its conductor breaks.
(2) An Electrical Inspector may, by notice in writing, require the owner of any such overhead line, wherever it may be laid, to protect it in the manner specified in sub-regulation (1) of this regulation.
(3) To prevent bird dropping on the suspension insulator strings, suitable bird guards as per relevant standards, shall be provided on cross arms of suspension tower or suspension pole structures, over the suspension insulator strings.
(1) The owner of every overhead line, substation or generating station which is exposed to lightning shall adopt means as per relevant standards for diverting electrical surges to the earth due to lightning which may result into injuries.
(2) The earthing lead for any lightning arrester shall be as short as possible and shall not pass through any iron or steel pipe, but shall be taken as directly as possible from the lightning arrester without touching any metal part to a separate vertical earth electrode or junction of the earth mat already provided for the substation of voltage exceeding 650 V subject to the avoidance of bends wherever practicable:
Provided that a vertical earth electrode shall be connected to the junction of the earth mat.
Where an overhead line ceases to be used as an electric supply line, namely: —
(i) the owner shall maintain it in a safe mechanical condition in accordance with regulation 59 or remove it; and
(ii) the Electrical Inspector shall, by a notice in writing served on the owner, require him to maintain it in a safe mechanical condition or to remove it within thirty days of the receipt of the notice.
(1) No underground power cable of voltage level up to 33 kV shall be laid without a minimum underground depth from ground surface to top of the cable as per relevant standards:
Provided that the underground power cable meant for use exceeding 33 kV shall be laid with a minimum underground depth of 1.2 metre.
(2) No underground telecommunication cable shall be laid without a minimum separation distance of 0.3 metre
(1) The Engineers or Supervisors engaged or appointed to operate or undertake maintenance of transmission and distribution systems shall hold degree or diploma in appropriate trade of Engineering from a recognised institute or university.
(2) The Engineers and Supervisors engaged or appointed to operate or undertake maintenance of transmission and distribution systems shall have successfully undergone the type of training specified in guidelines as per sub- regulation (4), within two years from the date of engagement or appointment.
(3) The Technicians to assist Engineers or Supervisors shall possess a certificate in appropriate trade, preferably with a two years course from an Industrial Training Institute recognised by the Central Government or State Government and should have successfully undergone the type of training as specified in guidelines as per sub- regulation (4), within two years from the date of engagement or appointment:
Where the return is partly or entirely uninsulated, the owner shall keep a continuous record of the difference of potential, during the working of his system, between every junction of an insulated return with an uninsulated return and the point on the route most distant from that junction, and the difference of potential shall not, under normal running conditions, exceed a mean value of seven volts between the highest momentary peak and the average for the hour of maximum load.
Where both the line and the return are placed within a conduit, the following conditions shall be fulfilled in the construction and maintenance of the system, namely:
(i) where the rails are used to form any part of the return, they shall be electrically connected at distances not exceeding thirty metre apart, with the conduit by means of copper strips having a cross-sectional area of at least 0.40 sq. cm or by other means of equal conductivity and where the return is wholly insulated and contained within the conduit, the latter shall be connected with earth at the generating station or substation through an instrument suitable for the indication of any contact or partial contact of either the line or the return with the conduit; and
(ii) the leakage current shall be ascertained daily, before or after the hours of running, when the line is fully charged and if at any time it is found to exceed 0.6 ampere per km of single tram
Where both the line and the return are not placed within a conduit, the leakage current shall be ascertained daily before or after the hours of running, when the line is fully charged and if at any time it is found to exceed 0.3 ampere per km of single tramway track, the transmission and use of electricity shall be suspended unless the leakage is stopped within twenty four hours.
(1) The personnel engaged for operation and maintenance at the control room shall hold degree or diploma in Electrical Engineering or in related trade of Engineering from a recognised institute or university.
(2) The Authority shall issue guidelines for the training and certification of personnel engaged for operation and maintenance at control room within six months of the notification of these regulations:
Provided that the roles and responsibilities of the certification agency, duration and content of the basic and advance certification and training course shall be as specified in the guidelines.
(3) The certification agency shall be a training institute recognised by the Authority:
Provided that the Load Despatch Centre shall arrange for training and certification of load despatcher from the certification agency recognised by the Authority as per guidelines issued under sub-regulation (2) of this regulation wi
Part-I Precautions to be observed: -
1. Name and address of the consumer
2. Details of installation
3. Short circuit fault level of the installation
4. Date of commissioning of installation (in case of additional supply or reconnection)
5. Results of tests conducted:
SI. Equipment Test Conducted Test Results Remarks No.
General Observations:
Name and address of the supplier
Date and time of failure of supply
Areas affected due to failure
Causes of failure
Probable time for restoration of supply
Additional information, if any
Place: Time:
(Name, Signature, Designation and Seal of Authority)
[See sub-regulation (1) of regulation 98] This form must be correctly filled up by the owner, agent, manager or engineer and sent to the Electrical Inspector of mines not later than the first day of February every year.
Part A Year ending: ____ Name of Mine: State: Situation of Mine: District: Postal address of Mine: Name and address of owner: Name of agent: [ATT II—ave 4] FIRT BT USI» AATATRS Name of manager: Name of engineer: Name of Electrical Supervisor:
Part B (1) — System of supply (whether direct current or alternating current): Voltage of supply: Periodicity (if alternating current): Source of supply: (2) Voltage at which electricity is used for: - Lighting: Power: (3) Particulars of motor etc.: - POWER (a) On Surface Type of Motor (HP/KW)/ | Type of control gear Location Purpose for which used apparatus and voltage (b) In Mine Type of Motor (HP/KW)/ | Type of | Location Purpose for | Ventilation Percentage of apparatus and voltage control which used inflammabl
Highest System Voltage (kV) Safety Working Clearance (Metre)
(1) The above values are valid for altitude not exceeding 1000 m. A correction factor of 1.25 per cent per 100 m is to be applied for increasing the clearance for altitude more than 1000 m and up to 3000 m;
(2) The above safety working clearances are based on an insulation height of 2.44 m which is the height of lowest point on the insulator, where it meets the earthed metal, from the ground;
(3) “Safety Working Clearance” is the minimum clearance to be maintained in air between the live part of the equipment on one hand and earth or another piece of equipment or conductor on which it is necessary to carry out the work, on the other;
(4) The “Highest System Voltage” is defined as the highest rms phase to phase voltage which occurs under normal operating conditions at
Sl. No. DC Voltage (kV) Pole to Earth Clearance (Metre) Ground Clearance (Metre)
(1) The above ground clearances are not applicable to equipment that are housed within fence or a building and where access is prevented under energised condition through a suitable safety interlocking scheme;
(2) The above pole to earth clearances are for conductor-structure electrode configuration using gap factor k equal to 1.35.
(3) It is recognised that within a substation many different types of electrode configurations shall be there with different values of k, therefore, the above clearance shall be modified based upon the values of gap factor for a particular electrode configuration subjected to the minimum ground clearance.
(4) Clearance shall be provided for electrical appa
1. Name of Substation
2. Utility
3. Faulty Equipment (ICT/auto-transformer/GT/reactor etc.)
4. Rating (MVA/MVAR, Voltage ratio, 1-phase/3phase)
5. Make (Original equipment manufacturer)
6. Serial No.
7. Date and time of occurrence of fault
8. Fault discovered during operation or periodic testing/ maintenance
9. Year of manufacturing
10. Date of commissioning
11. Sequence of events/Description of fault (SoE with time stamp, protection operated during fault)
12. Details of tests done after failure (What tests were conducted after the discovery of failure. If no tests were conducted, reasons for the same may be stated.)
13. Observations (Visual observations e.g. bulging of tank, fire, any leakage of oil, damage to various components of transformer/ reactor and nearby equipment/ material etc.)
14. Probable cause of failure
15. If original equipment manufacturer representative had inspected
[See sub-regulation (1) of regulation (60)] Nominal Clearance above ground Clearance | Clearance between conductor | Clearance above HFL for River voltage of between and rail level across Railway crossing system conductor Corridor and road surface (m) Across | Along | Elsewhere across Normal High rise OHE | Navigational Non- Street | Street Highway | OHE (where | for running of . navigatiional (m) river ; no double double stack river (m) (m) (m) . stack containers on (m) containers railwa (m) S y tracks. are to be run on railway tracks.)
[See sub- regulation (2) of regulation (60)] Sl. DC Ground Clearance Minimum Clearance above HFL for River crossing No. | Voltage | Clearance between clearance —— — 7 Navigational Non-navigatiional River (m) conductor and between road surface conductor and River (m) across Rail Level (m) Highwa ghway (m) (m)
[See sub-regulation (1) of regulation 60, sub-regulation (5) of regulation 62 and sub-regulation (5) of regulation 63] Maximum Deflection Bes “xe Maximum Deflection pecce nnn ane We Conductor portions s ' g i x VCL ' £ 1 0 i ° | 1 i ! I Minimum ilding styuctur Clearance Line ee GCL: Ground Clearance as per regulation 60 VCL: Vertical Clearance as per regulation 62 and 63 HCL: Horizontal Clearance as per regulation 62 and 63
[See sub-regulation (1) of regulation 98] This form must be correctly filled up by the owner, agent, manager or engineer and sent to the Electrical Inspector of mines not later than the first day of February every year.
Part A Name of Oil-field: Situation of Oil-field: Postal address of Oil-field: Name and address of owner: State: District: Year ending: 182 THE GAZETTE OF INDIA : EXTRAORDINARY [PART III—SEc.4] Name of agent: Name of manager: Name of engineer: Name of Electrical Supervisor:
Part B (1) — System of supply (whether direct current or alternating current): Voltage of supply: Periodicity (if alternating current): Source of supply: (2) Voltage at which electricity is used for: - Lighting: Power: (3) Particulars of motor etc.: - (a) On wells No. or other identifying mark of | Drilling or Type and H.P of No. of lamps Other electrical well pumping motor and type appliances 1 2 3 4 5 (b) Not on wells Type and rating of motor Purpose for which used Identifying mark
[See sub-regulation (9) of regulation 112, sub-regulation (9) of regulation (117)] Daily log sheet for: dd) Name of Electrical Supervisor (2) Report as to:- (a) Condition of the insulation of the system. (b) Specified defects of insulation (particulars of each failure of apparatus should be given). (c) Accidents or dangerous occurrence (including any cases of electric shock and any cases of open sparking in apparatus in use in places where regulation 112 applies. (d) Disconnection and reconnection of supply as required by sub-regulation (9) of regulation 112. (e) Examination of earth fault detectors or recorders as provided by sub-regulation (3) of regulation 102. (f) Examinations of apparatus as provided by regulation 117. [art TI—ave 4] AT PT UTA : TATATOOT 183 (i) Routine examinations as required by of sub-regulation (9) of regulation 117. (ii) Special examination* as required by of sub-regulation (9) of regulation 117. (3) Remarks: - Signed Examined by Electrical Supervisor: Eng
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