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anelson

Wire Color Requirements

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If you have the neutral of a relay coil wired to a normally closed contact and then to the system neutral, what color should the wire between the relay coil and contact be? I was always under the impression to use white since in my head it was  grounded AC, but as it was being discussed today some thought it should be red since if the contact is open then it is not grounded AC anymore. Anyone advice on this is appreciated.

Thanks,

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I'm not sure what's legally required, but in our machines, the white wire starts at the coil, even if the NC contact of the O/L relay is in series. We have some machines where the coil "neutrals" are all jumpered together and then pass through all of the overload relay contacts in series before being connected to system neutral. This means that if any overload relay trips, all of the contactors will drop out. All of the wiring is white, so it's very messy to trace the wiring.

Personally, I might lean towards using a different color if there's a contact in between. I don't think I've ever seen it done that way, though.

 

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White because the

potential has been consumed.

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Posted (edited)

11 hours ago, NevergoldMel said:

White because the

potential has been consumed.

...except when the O/L is tripped. Then we have a white wire with line voltage on it.

I've always wondered why we put the O/L contact on the neutral side of the coil. Why not put it on the high side of the coil?

ETA:

I guess to do what I described above, where a lot of contactors are dropped when any one is tripped... I've always seen it in the neutral side of the coil, even when it's a standalone starter, though.

Edited by Joe E.

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