jgramlich
Member
- Location
- Peoria, IL, USA
I've just added a new 220v-3ph receptacle in our shop. While I was installing I noticed some strange stray voltage. When I have the breaker for the 3ph circuit in the *off* position, I get a reading of 25v between any leg of the 220v-3ph circuit and my conduit (EMT).
We've been having some strange issues with our 120v-20A circuits in the shop tripping occasionally when the shop guys are using their angle grinders. It doesn't happen a lot and it happens with at least 5 different tools, so I suspect the circuits and not the tools they are using.
The 220v-3ph and the 120v circuits are all fed out of the same panel. I suspect there was some wire skinned when it got installed and I'm getting a "leak" somewhere because of that. I also suspect that this is what is causing our 120v breakers to trip...but I thought I'd ask around before ripping all the 120v wiring out and replacing it. I've already replaced a couple of the 120v-20A breakers to no avail. It isn't the breakers that are bad.
Thoughts?
We've been having some strange issues with our 120v-20A circuits in the shop tripping occasionally when the shop guys are using their angle grinders. It doesn't happen a lot and it happens with at least 5 different tools, so I suspect the circuits and not the tools they are using.
The 220v-3ph and the 120v circuits are all fed out of the same panel. I suspect there was some wire skinned when it got installed and I'm getting a "leak" somewhere because of that. I also suspect that this is what is causing our 120v breakers to trip...but I thought I'd ask around before ripping all the 120v wiring out and replacing it. I've already replaced a couple of the 120v-20A breakers to no avail. It isn't the breakers that are bad.
Thoughts?