calculating a 208v 1ph load for panel schedule phase loading

[Coastalguy1]

I thought I had this but sometimes you question things-

Example-
208v 1phase equipment- (counter top electric oven) 35.4A total

To calculate and show on a panel schedule which is correct?

#1- 35.4A/2= 17.7A per phase

#2- 35.4A x 1.732/2= 30.65A per phase

Thanks in advance for providing some clarity.

 

[Smart $]

As panel schedules go, it'd be #1... but to properly use such a panel schedule you have to understand its pros and cons. When you divide the amps (or VA) by 2, it is because an anticipated two other L-L loads are expected to balance it out. As an example, if this oven were the only load on the panel, the sum at the bottom would be extremely erroneous.

 

[charlie b]

Neither is correct. You don't (or shouldn't anyway) put amps on a panel schedule as the value for any specific load. You should show the loads in units of VA. In your case, the total load is 208 volts times 35.4 amps, or 7363 VA. I would put half of that (3682 VA) as the load on each phase. Only when you have put all the loads on the schedule and added the total load (in units of VA) on all phases do you convert to amps.

 

[kingpb]

Neither is correct. You don't (or shouldn't anyway) put amps on a panel schedule as the value for any specific load. You should show the loads in units of VA. In your case, the total load is 208 volts times 35.4 amps, or 7363 VA. I would put half of that (3682 VA) as the load on each phase. Only when you have put all the loads on the schedule and added the total load (in units of VA) on all phases do you convert to amps.

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Cheers~