Twoskinsoneman
Senior Member
- Location
- West Virginia, USA NEC: 2020
- Occupation
- Facility Senior Electrician
Got a situation where a 1600a CB feeds Feeds through a Corcom/Cornell Dubilier (http://www.cor.com) facility EMI filter to another 1600a CB before it goes to an ATS.
I noticed that with the second CB (one right before ATS) open, the first CB still reads 130a on its LCD panel. When I consulted with the engineer he told me that the filters don't actually consume any power but are creating a resonance that may be tricking the first breaker upstream on the filters into thinking there is 130a load on it. The only load possible would be if the filter were drawing... I haven't been able to put a meter on.
What do you think?
I noticed that with the second CB (one right before ATS) open, the first CB still reads 130a on its LCD panel. When I consulted with the engineer he told me that the filters don't actually consume any power but are creating a resonance that may be tricking the first breaker upstream on the filters into thinking there is 130a load on it. The only load possible would be if the filter were drawing... I haven't been able to put a meter on.
What do you think?