What is considered a high neutral current?
What is considered a high neutral current?
(OP)
Just curious. I was reading a load report that stated there was a high neutral current on a 200A Main Breaker in a 120/208V panel. The current on the breaker was 33.6 Amps. Is that considered too high?
Thanks,
-Mike
Thanks,
-Mike






RE: What is considered a high neutral current?
What is the load in each phase?
RE: What is considered a high neutral current?
RE: What is considered a high neutral current?
selfentitled:
You need to clarify the questions above.
RE: What is considered a high neutral current?
I can see 33A on a neutral being an issue, but how much is too much?
RE: What is considered a high neutral current?
RE: What is considered a high neutral current?
Alan
----
"It's always fun to do the impossible." - Walt Disney
RE: What is considered a high neutral current?
A difference can indicate a problem usually in another circuit.
This means that you may be getting some current flowing up in your neutral from someone else's, which is trying to get back to the transformer.
Ausphil
RE: What is considered a high neutral current?
RE: What is considered a high neutral current?
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: What is considered a high neutral current?
Phase A: 145A
Phase B: 143A
Phase C: 158A
Neutral Current = √((Ia²+Ib²+Ic²)-(Ia*Ib)-(Ib*Ic)-(Ia*Ic))
= √((145²+143²+158²)-(145*143)-(143*158)-(145*158))
= 14A
This is all great input, thanks!
RE: What is considered a high neutral current?
RE: What is considered a high neutral current?
In power stations a small neutral current in generator transformers is common to the extent of 5-100 A.
In low voltage distribution lines considerable neutral current can come with unbalanced loading. This may some times exceed phase current, when the load generates a lot of third harmonic currents in addition to unbalance loads..