Interpretation of NYC BC 2702 Emergency/Standby Power Systems

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I am not familiar with the NYC code but based on the way I read it, it seems they do not want the transfer switches in the same room as the emergency generator itself. 2702.1.7 states

2702.1.7 Automatic transfer devices and power system feeders.
Automatic transfer devices, emergency generators and emergency or standby power system feeders shall comply with Sections 2702.1.7.1 through 2707.1.7.2.1

2702.1.7.1 Prohibited location.
All automatic transfer devices and emergency power system feeders that serve required emergency power system equipment shall not be located in the same room as the emergency power system equipment or the main or primary electrical service equipment.

It does not state emergency power system loads. Furthermore would seem an odd requirement to not allow the transfer switch in the same room as the load it serves. Not sure what benefit there would be to that.

Do they offer a definition of emergency power system equipment anywhere? My educated guess is this is the generator itself.

Hope my interpretation helps!
 
LibertyEngineering said:
I am not familiar with the NYC code but based on the way I read it, it seems they do not want the transfer switches in the same room as the emergency generator itself. 2702.1.7 states

2702.1.7 Automatic transfer devices and power system feeders.
Automatic transfer devices, emergency generators and emergency or standby power system feeders shall comply with Sections 2702.1.7.1 through 2707.1.7.2.1

2702.1.7.1 Prohibited location.
All automatic transfer devices and emergency power system feeders that serve required emergency power system equipment shall not be located in the same room as the emergency power system equipment or the main or primary electrical service equipment.

It does not state emergency power system loads. Furthermore would seem an odd requirement to not allow the transfer switch in the same room as the load it serves. Not sure what benefit there would be to that.

Do they offer a definition of emergency power system equipment anywhere? My educated guess is this is the generator itself.

Hope my interpretation helps!
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Yes it helps. However I am not even sure why that code exist. Why would they not want an emergency generator and a automatic transfer switch be in the same room? Also I was looking at the definition to see what is defined as an emergency power system equipment but not sure where it is.
 
Honestly do not know the answer to that as it is in direct disagreement with NFPA 110 which does allow Transfer switches and associated panelboards in the same room as the generator but nothing else. The definition, I would assume, is located in the beginning sections of the NYC codes. That definition is key. Defining what they mean by Emergency Power System Equipment. Again the only thing I could imagine they mean by this is the gen set.
The only thing I can think would be they do not want an issue with a transfer switch to affect the operation of the generator. Like if there were a fire caused by one of the transfer switches.
 
LibertyEngineering said:
Honestly do not know the answer to that as it is in direct disagreement with NFPA 110 which does allow Transfer switches and associated panelboards in the same room as the generator but nothing else. The definition, I would assume, is located in the beginning sections of the NYC codes. That definition is key. Defining what they mean by Emergency Power System Equipment. Again the only thing I could imagine they mean by this is the gen set.
The only thing I can think would be they do not want an issue with a transfer switch to affect the operation of the generator. Like if there were a fire caused by one of the transfer switches.
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I see. Would an emergency power off switch to generator be considered emergency power system equipment?


Also, you know what else is weird? Read 2702.4, looks like NYC doesn't care about separating 700 and 702 loads too lol
 
I would think it is part of the Emergency Power System

2702.4 is simply stating what loads must be served by the optional standby system nothing about separation of loads. What is weird to me is why call it optional if it has loads that must be connected? Must be connected if you opt to provide it, very strange.
 
LibertyEngineering said:
I would think it is part of the Emergency Power System

2702.4 is simply stating what loads must be served by the optional standby system nothing about separation of loads. What is weird to me is why call it optional if it has loads that must be connected? Must be connected if you opt to provide it, very strange.
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but shouldn't the egress lighting and fire alarm be separate from optional loads? Why would it allow us to connect these to optional standby?
 
Just an FYI, but the Chicago Electrical code has the following under Article 701, Legally Required Standby Systems:

701.5 Transfer Equipment
701.5(E) Location
Transfer equipment shall not be located in the same room as the generator or service equipment.

Curiously, in article 700 for Emergency Systems, section 700.23 Transfer Equipment does not mention location. But it is otherwise nearly identical to 701.5.
 
Tainted said:
but shouldn't the egress lighting and fire alarm be separate from optional loads? Why would it allow us to connect these to optional standby?
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2702.04 makes no sense to me. In a sense I read it as the optional standby system must supply power to the legally required standby loads if the legally required system fails That's like saying the optional standby system is a different gen set. really I just do not get the intension of that section.
 
synchro said:
Just an FYI, but the Chicago Electrical code has the following under Article 701, Legally Required Standby Systems:

701.5 Transfer Equipment
701.5(E) Location
Transfer equipment shall not be located in the same room as the generator or service equipment.

Curiously, in article 700 for Emergency Systems, section 700.23 Transfer Equipment does not mention location. But it is otherwise nearly identical to 701.5
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And as I mentioned previously complete opposite of what NFPA 110 allows with respect to the location of the transfer switches.
 
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