Mister Kool
Member
in theory(At 100%), are you getting a total of 300A(100A per phase) to utilize when protected by a 3pole 100A main CB?
3phase 4wire 100A panel
- Thread starter Mister Kool
- Start date
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- Location
- New Jersey
- Occupation
- Journeyman Electrician
Assuming that you panel is 208Y/120 if all of your loads were 120 volts I would agree with that statement.
Mister Kool
Member
Given a 208Y/120 panel does it matter if the loads are all 120V?
please explain
Thanx
StephenSDH
Senior Member
- Location
- Allentown, PA
If your loads are all three phase (not using the neutral) then all your current would be fairly balanced on the three legs and you could have 100A on each hot.
If your loads are all single phase (hotA to neutral, hotB to neutral, hotC to neutral) then if your single phase loads are balanced you could end up with 100A on each hot phase, but 0A on the neutral because the sum of the currents cancel out.
If you have a mixture of single and three phase loads that are balanced then you can have 100A on each hot and 0 on the neutral.
The breaker is designed to trip if any one leg exceeds the trip curve of the breaker. If you have a mixture of loads which are not balanced you may have say 100A on HotA, 50A on HotB, 50A on HotC, and 50A on Neutral. In this case you are maxed out unless you rebalance your loads. As long as your loads are balanced you could have to theoretical 100%. (Some breakers are 80% rated so you could have the theoretical 80%)
Last edited:
Yes it matters.
You can only supply up to 100A of 208V 3? loads or 173A of 208V 1? loads.
The key is how many VA the panel can supply. In all cases it would be 36,000VA.
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