Fire Pump Supply

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jwilson

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Our project involves a fire pump in a new building on a government base. As 15kv is supplied to the building by the government owned and maintained distribution system, a transformer will be needed for utilization voltage for the building and fire pump.

It's my interpretation that "695.5 Transformers" governs and that the building transformer can't also supply the fire pump.

An opposing opinion is that "695.3(A)(1) Electric Utility Service Connection" allows the fire pump to be fed from the building transformer as long as the connection is made ahead of the main disconnecting means.

In my opinion, 695.3(A)(1) applies only to "utility" owned and maintained services.
 
Are you being held to the NEC by your client? Remember that you have far more latitude on a govt site than a conventional client.

Ie, the NEC can be an effective guideline, but is not enforceable on a site owned by the US Govt.

With this in mind, it would seem that your design decision will be made based on cost, safety and need rather than the NEC.
 
Fire Pump Supply

Actually the Gov't Engineer's opinion is that one transformer can serve both the fire pump and other building loads.
 
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