2000A ATS

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ereng1

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Location
NJ
Occupation
Electrician
Client wants to install a 2000A 480v service rated Automatic Transfer Switch inside a warehouse for standby generator.
Does a transfer switch of this size require an electrical room or can it be installed out in the open inside the warehouse against a wall (protected by bollards etc)?
 
It does not need a separate room, but may need controlled access, i.e. a cage keeping people away from it, depending on arc flash risk, open ventilation etc.
 
Does not even have to be inside. It can be 3r, and freestanding on a pad anywhere between the transformer and existing gear. Some restrictions apply, due to where the poco metering is, which may require metering to be moved, unless customer wants to give free power to the utility, and pay the poco for the privilege! LOL! (Have seen that mistake made before)
 
Thank you guys. Our preference is to have Nema 3R unit outside but the town is very particular about equipment in front of the building. So, our B-plan is to have it on the inside but then this other question came up. Metering is by the pad mounted transformer on the street. It will not be a factor.
Thanks again.
 
I know you said service rated, so is it actually going to be the service disconnect? Or will it be past the existing service disconnect? If it is the service disconnect, local fire codes may require it to be in a room.
 
There are several questions before you can decide if it requires a separate room.
Is this an Article 700 ATS?
Does your local jurisdiction adopt NFPA 110 via the building code.
If the answers are yes, it might. https://www.csemag.com/articles/nfpa-110-2016-design-considerations/

Chapter 7.2: Location

The EPS shall be installed in a separate room for Level 1 installation. Furthermore, the EPS room shall be separated from the rest of the building by 2-hour fire-resistance walls. Although NFPA 110 allows the EPSS equipment to be installed in the EPS room, it does not permit any other equipment-except those that serve this space-to be in the EPS room. NFPA 110, Chapter 7.2.3, requires Level 1 EPSS equipment is not be installed in the same room with the normal service equipment where the service equipment is rated higher than 150 V to ground and equal to or greater than 1,000 amps. NFPA 110 does not restrict Level 2 EPSS equipment from being located in the same rooms with Level 1 equipment (see Figure 3).
 
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