HVAC unit GFCI service receptacles

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mjrybar

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I am reviewing an equipment specification for a large commercial food storage warehouse (Washington State) that has included the following clause
"Provide 120V, 20 amp, weatherproof, duplex GFCI receptacles, factory installed and wired with single point power connection, transformer, power to receptacle ahead of the equipment disconnect." The equipment involved are make-up air units (gas fired and electric coil) and large ventilation fans for emergency smoke evacuation. The equipment manufacturer has indicated this is in violation of NEC and that a separate 115V power source is required for the service receptacles. Can a single point power connection be made to these units?
 
Re: HVAC unit GFCI service receptacles

The NEC does not require a second power source. The only code requirement is that this receptacle be within 25' of the equipment and that it not be connected to the load side of the equipment disconnecting means. See 210.63.
Don
 
Re: HVAC unit GFCI service receptacles

Please help me out here. If I do not need a separate power source for my 120V GFCI at the A/C unit, does that meen that I can tap the line side of the disconnect of lets say a 60A 3phase unit and install my GFCI ? I think this would be a violation? No fuse protection for the GFCI, etc..
 
Re: HVAC unit GFCI service receptacles

You can apply OCPD at the point of the tap. In this case it looks like both overcurrent protection and a transformer would be required.
Don
 
Re: HVAC unit GFCI service receptacles

What is the supply voltage? Sounds like you are going to need a transformer and OCPD. Might be cheaper and/or easier to pull a separate circuit for GFCI.
 
Re: HVAC unit GFCI service receptacles

I was thinking since this is not a control transformer but rather a transformer to a 120v outlet you would need a neutral present that is tied into the grounding electrode system
 
Re: HVAC unit GFCI service receptacles

Thanks for all the replies. I understand what I need to do this properly, and I always run a separate line for the GFCI. I was just wondering as the wording states in the code if someone had a different idea. I see you need to pull a neutral and than install some type of fuse protection etc.. in the example I used.
 
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