ATS Location Requirements for Level 2 Installation

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Turk1957

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Installing an Automatic Transfer Switch for a Commercial Office Building application... Reading NFPA 110, I would deem this a Level 2 installation, as the installation would not result in loss of human life or serious injury. With that being said, I cannot find specific installation requirements for the ATS.... NFPA 110, 7.2.1 specifically states that the EPS shall be installed in a separate room for Level 1 applications and 7.2.1.1 elaborates by saying that the EPS rooms shell be separated from the rest of the building by construction with a 2-hour fire resistance rating. Nowhere does it give any specific requirements for a Level 2 application.... Does a Level 2 ATS need to be in a fire-rated room? Any insight would be GREATLY appreciated....
 
Turk1957 said:
Installing an Automatic Transfer Switch for a Commercial Office Building application... Reading NFPA 110, I would deem this a Level 2 installation, as the installation would not result in loss of human life or serious injury. With that being said, I cannot find specific installation requirements for the ATS.... NFPA 110, 7.2.1 specifically states that the EPS shall be installed in a separate room for Level 1 applications and 7.2.1.1 elaborates by saying that the EPS rooms shell be separated from the rest of the building by construction with a 2-hour fire resistance rating. Nowhere does it give any specific requirements for a Level 2 application.... Does a Level 2 ATS need to be in a fire-rated room? Any insight would be GREATLY appreciated....
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Is this a legally required standby system? NEC article 701.
Is this an emergency system? NEC Article 700.
Is this an optional standby system? NEC Article 702.
Has the AHJ declared it legally required?
There is a big difference between legally required and optional standby requirements.
 
Turk1957 said:
Installing an Automatic Transfer Switch for a Commercial Office Building application... Reading NFPA 110, I would deem this a Level 2 installation, as the installation would not result in loss of human life or serious injury. With that being said, I cannot find specific installation requirements for the ATS.... NFPA 110, 7.2.1 specifically states that the EPS shall be installed in a separate room for Level 1 applications and 7.2.1.1 elaborates by saying that the EPS rooms shell be separated from the rest of the building by construction with a 2-hour fire resistance rating. Nowhere does it give any specific requirements for a Level 2 application.... Does a Level 2 ATS need to be in a fire-rated room? Any insight would be GREATLY appreciated....
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I think before we answer this, I would ask first if this really a Level 2 system. Will this be supplying Article 700 loads such as exit and egress lighting? If so, it will need to be a Level 1 system.
 
texie said:
I think before we answer this, I would ask first if this really a Level 2 system. Will this be supplying Article 700 loads such as exit and egress lighting? If so, it will need to be a Level 1 system.
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Actually, the generator is sized to feed the "entire" building, not simply the "life safety" requirements... So, in the event of a power outage, ALL the lights and ALL the other systems are restored within the building footprint....
 
Turk1957 said:
Actually, the generator is sized to feed the "entire" building, not simply the "life safety" requirements... So, in the event of a power outage, ALL the lights and ALL the other systems are restored within the building footprint....
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How is emergency egress lighting powered?
 
Turk1957 said:
Actually, the generator is sized to feed the "entire" building, not simply the "life safety" requirements... So, in the event of a power outage, ALL the lights and ALL the other systems are restored within the building footprint....
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A single genset with a single ATS supplying the entire building would be an Article 702 system and NFPA 110 would not even apply. That said, as asked by dkidd what arrangement do you have for exit and egress lighting? An Article 702 system cannot be the source of supply for these loads.
 
texie said:
A single genset with a single ATS supplying the entire building would be an Article 702 system and NFPA 110 would not even apply. That said, as asked by dkidd what arrangement do you have for exit and egress lighting? An Article 702 system cannot be the source of supply for these loads.
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Just for my own education, why can't an Article 702 system be a source supply for emergency loads? If the generator is sized properly for all the loads in the building, and the transfer switch operates upon loss of power and ALL the lights come back on, what's the issue?
 
Turk1957 said:
Just for my own education, why can't an Article 702 system be a source supply for emergency loads? If the generator is sized properly for all the loads in the building, and the transfer switch operates upon loss of power and ALL the lights come back on, what's the issue?
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A single genset can be the supply for 700, 701 and 702 loads. The devil is in the details. For example, a single genset complying with NFPA 110 as a Type 10, Level 1 could supply all types of loads but the Article 700 load would have to be served by it's own (listed for emergency use) ATS and comply with all the other requirements of a complete Article 700 system.
 
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