Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Based on my calcs I would be ok bringing 200A to this panel? This is a temp power situation.
VA Calc
- Thread starter Alwayslearningelec
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
The 60 and 70 amp breakers are feeding sub-panels? Even with a calculated load of 201 amps 200 would work although technically not code complaint unless you can alter the loads slightly. Did someone check is 201 amps correct?
Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Yes they are. Not sure if it was checked.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Since those are all single phase temp sub-panels the loads will vary anyway so you'll very likely never get anywhere near the calculated load.
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
If the VAs shown are accurate, then B phase is most heavily loaded at 25450 VA, or 212A @ 120V.
However, Circuit 4 is shown as overloaded with 9030 VA on a 120V 70A circuit, which can only provide 8400 VA. So perhaps that is a typo.
Cheers, Wayne
However, Circuit 4 is shown as overloaded with 9030 VA on a 120V 70A circuit, which can only provide 8400 VA. So perhaps that is a typo.
Cheers, Wayne
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
Also, looking at the legend, I guess these are supplying 120/208 3-wire "single" phase panels. If all the loads are 120V, this VA method is fine. If there are 208V loads, then dividing those among the two conductors by take 208V * Load Amps to get VA, dividing that by two, and assigning half to each conductor is non-conservative. A conservative method would mulitply the 208V current by 120V and assign that value to each conductor.
Lastly, the breaker size for the 1J power supply is missing.
Cheers, Wayne
Lastly, the breaker size for the 1J power supply is missing.
Cheers, Wayne