SIZING FIRE PUMP OCPD

[binwork91]

How to size the OCPD for Fire pump?
NEC code make me feel confuse.


For example. 208V 50HP fire pump. how do you size the utility side fuse and generator side breaker?
For utility side, should I use RLA or 6 times of FLA? Is there a maximum size of fuse i can use?
For generator side, is the breaker size between 125% to 250% of FLA?

Please explain the way how to size them. Thank you.

 

[infinity]

Is this in New York City? If so the NYC local amendments are different than the NEC requirements.

 

[binwork91]

Is this in New York City? If so the NYC local amendments are different than the NEC requirements.

For the Job in New York City, I am fine.
In fact, this Job is in New Jersey. When I study the drawing other people make. I try to find out how other engineer size the OCPD for Fire pump.
I think New Jersey is using NEC. So I read the NEC, and try to find out the answer. But it make me confuse.
Therefore, I come here and ask for help.

 

[infinity]

For the Job in New York City, I am fine.
In fact, this Job is in New Jersey. When I study the drawing other people make. I try to find out how other engineer size the OCPD for Fire pump.
I think New Jersey is using NEC. So I read the NEC, and try to find out the answer. But it make me confuse.
Therefore, I come here and ask for help.

Yes NJ is under the 2017 NEC so your answers will be in Article 695.

 

[binwork91]

Yes NJ is under the 2017 NEC so your answers will be in Article 695.

I read the Article 695.4 B (2). I have a hard time to get the answer.
695.4 B (2) (a) is talking about individual sources. But in my case, it has generator. Does it comply with this section?
695.4 B (2) (b) is talking about generator, it comply with 430.62.

In a word, I want to know how to size OCPD on mathematics.