ESE Dates

Group A posts are superior to Group B posts in ESE, and a Group B officer reports to a Group A officer. CPES (Central Power Engineering Services) group posts: one who joins the post of Assistant Director I or Assistant Executive Engineer (AEE) in the CEA (Central Electricity Authority). They report to Deputy Directors. CPES (Central Power Engineering Services) Group B posts: one who joins the post of Assistant Director II or Assistant Engineer (AE) in CEA. They are inferior in terms of rank to Assistant Director I. If you got your Group B job through ESE, it takes about 4 years to get to Group A. If one has gotten a group B post through SSC RRB or JE exams or any other exam like junior works manager, etc. , then it will take 10 to 15 years to become a group A officer. Salary (as per the 7th pay commission):
Group A posts: Basic pay: INR 56100 (INR 15600 + INR 5400, 6th pay)
Group B posts: Basic pay: INR 47600 ( INR 9300+ INR4800,0 6th pay)
So, if one joins Group B posts through ESE, they will be junior in terms of rank to Group A officers. They will also get a lesser salary as there is a difference in basic pay.