Question, I have a customer who has a single phase 400-meter channel spilt into 2 -200amp panels. At pole transformer he is poling 305amps on each leg. In each panel on leg A is 175amps and leg B 175amps. how is this not tripping out his 200amp main breaker? is load is 240V.
200amp panel
- Thread starter Fire238
- Start date
- Status
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I don't see the issue. 175 amps on each leg will not trip a 200 amp breaker. Maybe I am misunderstanding your question
Carultch
Senior Member
- Location
- Massachusetts
A 200A breaker by design, is meant to only trip if there is more than 200A on at least one of its poles. Could be >200A on both poles, or could be >200A on just one pole. The current is not additive, but rather each pole independently determines if it should trip.
175A on each line of a split-phase system, is not 350A at 240V. It's the equivalent total power of 350A at 120V, but it isn't 350A anywhere. It's still 175A at 240V.
Thanks, I was thinking the 200amp braker was a total it could see. At my transformer I have 350 at each leg, which was sized for 400amps at 120v
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