78 The only issue raised in this appeal is whether the defend ant No. 1, that is, the Punjab State Electricity Board is competent to discriminate between diploma holders and non diploma holders Line Men forming the common cadre of Line Men having a common seniority list in promoting these Line Men on the basis of quota fixed by the order of the State Electricity Board even though the requisite qualification for promotion for Line Man to the post of Line Superintend ent is either the holding of diploma or certificate for electrical engineering from a recognised institute or the non diploma holders having passed one and half year 's course in the trade of Electrician/Line Man/Wire Man from recog nised Industrial Training Institute and are matriculates and have worked for four years as Line Man continuously and immediately before promotion, as has been provided by the office order No. 97/ENG/BET/G 33 dated 22.10.1968 the rele vant excerpt of which is quoted herein below: "Far Direct Recruitment: a) Possess 3 years, certificate or diploma course in Electrical Engineering from any recognised Institute, or a certificate of having passed the N. 'C.C. Test conducted by the State Board of Technical Education/All India Council for Technical Education.