Fire Pump disconnect

[codequestion]

Attached is riser diagram. I have ATS/controller and fire pump all in same room different then electrical room. My questions are following:

1. Do I need disconnect between ATS/controller and fire pump per NEC 2014?

2. Does the ATS/controller disconnect be non fused or fused per NEC 2014?

 

[texie]

Attached is riser diagram. I have ATS/controller and fire pump all in same room different then electrical room. My questions are following:

1. Do I need disconnect between ATS/controller and fire pump per NEC 2014?

2. Does the ATS/controller disconnect be non fused or fused per NEC 2014?

1) No, and not allowed.
2) The Fire pump controller/ATS is a factory built unit and is the disconnect and is SUSE rated. You run service conductors directly to it. Note that the service conductors have to be "outside" the building as the engineer noted.
This will be a service, so you will need to connect to GEC system. Also the service neutral needs to be brought to the FP controller even though you are not using it.

 

[codequestion]

1) No, and not allowed.
2) The Fire pump controller/ATS is a factory built unit and is the disconnect and is SUSE rated. You run service conductors directly to it. Note that the service conductors have to be "outside" the building as the engineer noted.
This will be a service, so you will need to connect to GEC system. Also the service neutral needs to be brought to the FP controller even though you are not using it.

Ok but ats controller has non fused disconnect. Can it be fused since it is service equipment?

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[augie47]

Interesting. have not seen many that serve a fire pump disconnect and ATS but the ones I have seen that a SUSE had overcurrent devices on both normal & emergency feed.
I'll have to look at the Code closer but you question has merit

 

[texie]

Ok but ats controller has non fused disconnect. Can it be fused since it is service equipment?

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The controller is listed and has all required OCP and disconnect for use as service equipment. Just make sure you order it with utility as primary and generator as secondary source (they can be utility/utility).
Combination FP/ATS controllers like this are very common and fully rated for this type of application. That drawing note looks like an Eaton number. These are all rated to be installed as I describe.

 

[codequestion]

The controller is listed and has all required OCP and disconnect for use as service equipment. Just make sure you order it with utility as primary and generator as secondary source (they can be utility/utility).
Combination FP/ATS controllers like this are very common and fully rated for this type of application. That drawing note looks like an Eaton number. These are all rated to be installed as I describe.

So should i change to fuse disconnect OCP fire pump ats controller?

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[gadfly56]

So should i change to fuse disconnect OCP fire pump ats controller?

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You do not add anything to the one-line as shown. It doesn't need anything else.

 

[steve66]

695.4 permits OCP on the service to the fire pump, but it doesn't require it. However, a note in the handbook basically says (and I'm paraphrasing) "a direct connection without OCP is preferred. However, other code articles may require OCP"

I believe 230 required OCP for services, and I don't see an exception for fire pumps. So IMO, the fire pump ATS does need OCP on the service side.

Also, on your 1600 amp ATS, it needs to be marked from the manufacturer that is service entrance rated. So it basically has to be listed and labeled as a service entrance ATS.

A service entrance ATS will have a disconnect and OCP for the utility side.

 

[gadfly56]

695.4 permits OCP on the service to the fire pump, but it doesn't require it. However, a note in the handbook basically says (and I'm paraphrasing) "a direct connection without OCP is preferred. However, other code articles may require OCP"

I believe 230 required OCP for services, and I don't see an exception for fire pumps. So IMO, the fire pump ATS does need OCP on the service side.

Also, on your 1600 amp ATS, it needs to be marked from the manufacturer that is service entrance rated. So it basically has to be listed and labeled as a service entrance ATS.

A service entrance ATS will have a disconnect and OCP for the utility side.

The combination ATS/controller has the disconnect and proper OCP built in. No additional devices required.

 

[steve66]

The combination ATS/controller has the disconnect and proper OCP built in. No additional devices required.

Agree, but the note on the combination ATS/controller says non-fused disconnect.

It should say disconnect with proper OCP. At least it should if OCP is in fact required.

 

[codequestion]

Agree, but the note on the combination ATS/controller says non-fused disconnect.

It should say disconnect with proper OCP. At least it should if OCP is in fact required.

Thats my question note says non fused disconncet instead should it say fused disconnect?

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