I have a 3 phase 600 volt prim. feed and a 120/208 sec.
Isolateing tranformer .We are using this system for safety
against shock . What is the proper grounding ?? Does the
common on sec. get earth ground ???

Test on three subjects Physics, Chemistry & Biology are to
be conducted simultaneously the number of candidates for the
tests are 68, 36 and 72 respectively. Candidates are to be
seated in different rooms such that each room will have
candidates of the same subject and the load on each
invigilator be the same i.e. the number of candidates in
each room should be the same what is the minimum number of
rooms you need for the purpose

How can i calculate the Breaking capacity of molded case
circuit breaker, is the breaking capacity of CB for Diesel
generator shall be less than grid supply's breaker ?