( 1 ) THE present petition has been filed by the promotee officers of Delhi Electric Supply Undertaking (for short DESU) impugning the provisional seniority list dated April 24, 1992, which has subsequently been confirmed and finalised by the Seniority list dated April 27, 1993, and continuation of the same on May 14, 1993. The challenge has been based on the interpretation of the Regulations made by the Municipal Corporation of Delhi under Section 98 of the Delhi Municipal Corporation Act, 1957, (hereinafter referred to as "1968 Regulations" ). The said Regulations are known as " Delhi Electric Supply Undertaking (D. M. C.) (Seniority) Regulations, 1968, which fixes the basis of the relative seniority of direct recuits and promotees, as well as, the principle of rotation of vacancies vide clause 7 of the Regulations.

( 2 ) THE petitioners also amended the writ petition by moving an application C. M. No. 4966 of 1993) for urging certain additional grounds in support of their challenge to the final seniority list of Assistant Engineers. The challenge to the seniority rules was also made on the ground that the said rules became in-applicable to the present case, as th