Facility voltage - 240 three phase, grounded B (Corner grounded Delta)
Proposed Installation - Ten (10) single phase dehydrators. 240 volt, 46 amps. (just over 11kw each)
The dehydrator will be in 'continuous' operation.
If we were to install a feeder supply 10 dehydrators, being sure to balance them between phases (of course having one phase circuit unbalanced due to the tenth dehydrator), how would we calculate the feeder size?
My thoughts would be a 230 amp feeder (with 250 OCPD) because the following scenario should provide the highest current draw; if the only four dehydrators operating are the ones wired on the same phase circuit (for sake of example A&C) we would calculate as follows;
4 (dehydrators) * 46 (FLC) * 1.25 (continuous) = 230 Amps
As other dehydrators come on line current would be reduced on A&C circuit. If all ten were running the max current across A&C would be around 140 amps. Effectively - 33KVA three phase load + one 11KW single phase load.
Is this the correct way to look at this installation? :thumbsup: or :thumbsdown:
Proposed Installation - Ten (10) single phase dehydrators. 240 volt, 46 amps. (just over 11kw each)
The dehydrator will be in 'continuous' operation.
If we were to install a feeder supply 10 dehydrators, being sure to balance them between phases (of course having one phase circuit unbalanced due to the tenth dehydrator), how would we calculate the feeder size?
My thoughts would be a 230 amp feeder (with 250 OCPD) because the following scenario should provide the highest current draw; if the only four dehydrators operating are the ones wired on the same phase circuit (for sake of example A&C) we would calculate as follows;
4 (dehydrators) * 46 (FLC) * 1.25 (continuous) = 230 Amps
As other dehydrators come on line current would be reduced on A&C circuit. If all ten were running the max current across A&C would be around 140 amps. Effectively - 33KVA three phase load + one 11KW single phase load.
Is this the correct way to look at this installation? :thumbsup: or :thumbsdown: