Hey everyone I am having a hard time understanding this calculation. If a single phase load is being fed by a 208V 3phase panel do we calculate the VA by just multiplying the circuit breaker rating to 208V or it should be [breaker rating/1.732] (208V) ?
Single phase load in 3-phase panel
- Thread starter liaxx2023
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- Location
- New Jersey
- Occupation
- Journeyman Electrician
You would not use the 1.732 factor in the calculation when the load is single phase.
So the case is there's a 48A single phase continuous load that will be supplied by 3-phase panel 208V as per the problem. When I make a load schedule the demand load of each loads is computed as [60/1.732][208V]? or just [60][208V]?
- Location
- Tennessee NEC:2017
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- Semi-Retired Electrician
Don't use the 1.732 as you just quoted infinity as saying.
When do we usually use this formula, [breaker rating/1.732] (208V) ?
Krusscher
Senior Member
- Location
- Washington State
- Occupation
- Electrician
for 3 phase loads not single phase
Krusscher
Senior Member
- Location
- Washington State
- Occupation
- Electrician
also why are you using breaker rating vs what ever it is feedings rating?
This sounds like it’s for a 48A EVSE and he’s applying the 1.25 continuous load factor. Thus 60A.
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