The only utility generally used is water for the fuel coolers.I think we had Detroit Diesel/inspection and the EE signed off on ours as our fuel is constantly circulating from a 10000 gallon in ground tank to our day tanks and back.Hospitals usually have one tank for both the generators and the boilers.
It just has to pass the yearly 24 hour load banking simulation.This is a 2003 instillation and ran with no water for 12hrs with out problems in the blackout.
Also the T-switch is always located in the main electrical room.The gensets are in a fire proof vault that has no other purpose.
Best to get the Electrical engineer and Inspector to sign off on every aspect before you start regardless of the code book.Definatly have a PE stamp for third party liability
cheers
