Sizing service conductors for multiple roof top units

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finhead

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Does anyone know how to size service conductors for six roof top units. The nameplate gives minimum circuit ampacity and maximum overcurrent protective device. Article 220 says to go to 440.6, but that section only talks about branch circuit conductors.
Any ideas?
Brian Dolan
 
Re: Sizing service conductors for multiple roof top units

Are you talking about roof mounted A/C units?
 
Bob and Tom

The question pertains to Roof Mounted A/C units with hermetically sealed compressors. I am trying to determine how much load to add to the service conductors - or to feeder conductors.
 
100% of the nameplate rating of the equipment will be required for the service calculation. This will be the rated load current (RLC).
 
Bob

Why are you tormenting me? I wrote in the original question that Article 220 sends you to Article 440. So the question is, what part of Article 440 pertains to feeders that serve more than one roof top unit.
 
I am trying to determine how much load to add to the service conductors - or to feeder conductors.
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The answer to your question is not found in 440. 220 is about services and feeders. Art 220.4A speaks to your question.


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