The fire pump means it's complicated by a lot of circumstances that you have not gone into. The following link is not an endorsement of products, but this article does a decent job of laying out these complexities. But the first one, alluded to but not explicit, is to start with which code cycle you are required to adhere to in your state. It makes a big difference. This article refers to the 2014 Code, many places, California for example, are still on the 2011 Code.' You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals' - Booker T.
WashingtonRE: NEC code requirement (Electrical) 24 Aug 17 12:57. Per the NEC 695.4(B)(22)(a) & (b), a Fire Pump motor circuit only needs short circuit protection. Not ground fault protection, not even normal overload protection:'(a) Individual Sources.
Automatic Transfer Switch Controllers The FT Series Fire Pump Controllers are designed to provide automatic transfer from normal to alternate power when the normal source of power drops below 85%, or is lost in any or all phases of the normal power supply.
The overcurrent protective device(s) shall be rated to carry indefinitely the sum of thelocked-rotor current of the fire pump motor(s) and the pressuremaintenance pump motor(s) and the full-load currentof the associated fire pump accessory equipment when connectedto this power supply.(b) On-Site Standby Generators. Overcurrent protectivedevices between an on-site standby generator and a firepump controller shall be selected and sized to allow forinstantaneous pickup of the full pump room load, but shallnot be larger than the value selected to comply with 430.62to provide short-circuit protection only.'
RE: NEC code requirement (Electrical) 7 Sep 17 04:56.