overcurrent protection for FTU's

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sam34

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I hvae 3 Fan Terminal Units (FTU),each;4kw (heat),1/3hp fan, 277/480/3phase.They all provided with non-fused disc. switch. Can I combine all 3 of FTU's on one 20A/3P? In the past, I have been known that i have to have a fused disc.sw. in order to do it. does section 424-3(a) allow to combine loads with max. 30A overcurrent protection. Thank you.
 
Re: overcurrent protection for FTU's

This is what I would consider:
With regards to protecting the FTUs I don't think that you can determine the rating of the OCPD, the manufacturer of the FTU would have to specify what size OCPD must be used to protect their product. Otherwise, the cable is sized to carry the load and the OCPD sized to protect the cable.
 
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