Existing Junction Box with service wires 3/350mcm 3 phase 480 volt, out of that feeds Fire pump controller , then seperate run to another service disconnect. They want to add transfer switch & generator. Can one transfer switch be used for both Fire pump controller & control power panel? generator sizing ? (remember Fire Pump) 125 hp 3 phase. 480 10kva Transformer for misc. 480/120/240v 1phase
Yoop: IMHO, the first person would be an EE/PE or qualified Architect, who should be well versed with gensets, transfer switches and fire pumps. The second person would be the local AHJ, both electrical and fire.
As Le said, 695.6 (F); and the gen/trans become legally required, not optional systems. (I think those are the right terms)
EE/PE or Qualified Architect. Ya right. Look at most the prints out today. Hard to find anyone well versed on Fire pumps ect/ Lotta genertic answers & look in code book. This is a Township pump. 30 hp 480 volt takes care of business unless they have a fire somewhere in township that lowers water pressure , then Fire pump kicks on to maintain pressure. One service to remote building & there adding backup Generator. Not a Normal Job. Yoopersup
"then Fire pump kicks on to maintain pressure." By definition, that sounds like a pressure maintenance (Jockey) pump, and not a fire pump.
IMHO, as you say this is a Twp. pump, they should be giving you the specs for what they want/require. The 'spec' & drawings by a PE/EE/Arch are required to get plan review approvals (based on NEC) and permits issued.
This also relieves you of any liability for the 'design', unless you have DB coverages and do the design.
30 hp Pump maintains normal Pressure, 125 Hp pump kicks on only when theres a high draw like fire. Right now 125 Hp on Fire Pump controller But it does not have transfer switch. #0 hp not Jockey pump & 125 hp sure not Jockey pump.
When I think of fire pumps I think about a system designed to carry the pump in locked rotor until it either frees up and starts working again or until the motor burns up. I assume transfer equipment should be sized that way too.
I agree & for buildings that require Fire pumps thats always the case. I;m wondering if this by definition is really a Fire Pump as its at a Township pumping station & servers the main water system. Like I said a 30hp takes care of Business unless something like a fire drawing large amouts of water. All the controls in the building are required to operate the System. Little different from average I run into. Yoopersup