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Discussion Starter · #1 ·
Just saw another job they did with a feeder calculation for kitchen equipment. Very similar to the one I posted about before, here is the calculation

17a 208v = 3536
16a 208v= 3328
(espresso)5200watt
2 900va coffee grinders= 1800va
water heater 2000watts
2 duplex receptacles= 360va
total 15864 va
15864 X .65= 10311.6

10311.6 + 360=10670.6

10670.6/208= 51.4 amps

They used a 50amp breaker/circuit for this run.

Would you sweat the 1.4 amp since technically the circuit is too small for the run?
 

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Just saw another job they did with a feeder calculation for kitchen equipment. Very similar to the one I posted about before, here is the calculation

17a 208v = 3536
16a 208v= 3328
(espresso)5200watt
2 900va coffee grinders= 1800va
water heater 2000watts
2 duplex receptacles= 360va
total 15864 va
15864 X .65= 10311.6

10311.6 + 360=10670.6

10670.6/208= 51.4 amps

They used a 50amp breaker/circuit for this run.

Would you sweat the 1.4 amp since technically the circuit is too small for the run?
If someone uses those receptacles for something other than a phone charger, it ain't gonna be pretty.
 

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you need to add up the va's and get the max unbalanced load, since it looks like you've got single phase and three phase equip attached to the feeder (unless I'm reading this wrong and you are feeding this with just 2 phases)
 

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Discussion Starter · #4 ·
you need to add up the va's and get the max unbalanced load, since it looks like you've got single phase and three phase equip attached to the feeder (unless I'm reading this wrong and you are feeding this with just 2 phases)
Its only 2 phases. Basically this is a #8 size wire, 2 hots, 1 neutral and 1 ground.

Its a long run (about 100ft), but these guys didn't even account for voltage drop. I know its not 'required' but it is strongly recommended in the NEC.
 

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Just saw another job they did with a feeder calculation for kitchen equipment. Very similar to the one I posted about before, here is the calculation

17a 208v = 3536
16a 208v= 3328
(espresso)5200watt
2 900va coffee grinders= 1800va
water heater 2000watts
2 duplex receptacles= 360va
total 15864 va
15864 X .65= 10311.6

10311.6 + 360=10670.6

10670.6/208= 51.4 amps

They used a 50amp breaker/circuit for this run.

Would you sweat the 1.4 amp since technically the circuit is too small for the run?
This is cutting it close, but due to load diversity I wouldn't sweat it. The coffee pots are not ALWAYS brewing, the grinders are not ALWAYS grinding, the water heater is not ALWAYS heating... However the line has been crossed between "your main will never trip" and "Your main could trip."
 
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