generators and fire pumps

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sleepy

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question and alittle help please, nec art 695 generator: "shall be of sufficient capacity to allow normal starting and running of the motor driving the fire pump. let say we have a 50hp firepump (65amps) lock rotor is 363amps. that is the size of our generator. a tap ahead of the on site generator disconnect means is not required. just verifing. thank you
 
Re: generators and fire pumps

What about the jockey pump? Seems there is something about that also and any other associated equipment. I agree tap ahed of gen set not needed but looks like you may be looking at a 500-600 amp breaker.
 
Re: generators and fire pumps

There is a lot more to sizing the generator and breakers. First off, the maximum starting voltage dip for a fire pump is 15% this will drastically increase the size of the generator over that needed to run a "regular" motor of the same horse power. Also sizing of the generator's main line circuit breaker is not trivial. See this thread for more info:

http://www.mikeholt.com/codeforum/ultimatebb.php?ubb=get_topic;f=11;t=005676#000003
 
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