Quote Originally Posted by Derlyn View Post

Anyway, without sabotaging this thread, how does one get by 6.6.1.1 with so many supplies on the busbar. Is there a multipole isolator that shuts off all the supplies or does each one go through its own isolator ?
Basically each has it's own CB and then onto the main Busbar - With 2 transformers in parallel you generally have a bus coupler that will isolator the main busbar in the middle .

Label , Label and label again and also keys especially if you have "unlike" transformers ( 2 keys and 3 switches so only 2 can be on at the same time) . Have got to centers where phasing was never done correctly on installation and closed the bus couple to be able to open a transformer CB for servicing without dropping supply and the "bang" is real.
I have learnt not to trust others and check the phasing and direction now before closing.