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Autodesk
Autodesk

hi @scbunker and @oduday 

 

Revisiting this.. I see that your receptacle demand is taken per-phase (e.g., so a panel w/ exactly 10kVA per phase will be 30kVA/(208(sqrt3)) = 83.3A (thus, no derating).  Is it correct to interpret that since each phase is not derated, that the feeder/service (e.g., the OCPD) would similarly NOT be derated?

 

How would you compute the demand on a series of clothes driers per (220.54).  Assume each is 208v/1p (L-L), 2kVA, each on a dedicated circuit.

 

Thus, Phase AB has 2 driers, BC has 2 driers, and CA has 2 driers... result is that each phase sees 4 driers.. but the 3-phase OCPD for the feeder would see 6.  Would you apply a 75% factor to the OCPD (and/or the feeder), or would you leave it at 100%... and would you expect all engineers (at least those governed by the NEC) to follow suit?

 

example.png

 

ecd.png