120VAC and 125Vdc Wires in Wireway
120VAC and 125Vdc Wires in Wireway
(OP)
I have a little circuit which do some VFD pre-charging. The coils are operated at 120VAC and one of the out contacts is used to close a circuit breaker rated for 125Vdc (Potter Brumfield KUEP-3A15-120).
Due to limited space for putting a separate wireway, the wires are inevitably installed in the same wireway. Both are digital signals. If the wire insulation is 600VAC, I am thinking that it will be fine as long as I properly mark which is AC and DC.
Any comments?
Due to limited space for putting a separate wireway, the wires are inevitably installed in the same wireway. Both are digital signals. If the wire insulation is 600VAC, I am thinking that it will be fine as long as I properly mark which is AC and DC.
Any comments?






RE: 120VAC and 125Vdc Wires in Wireway
RE: 120VAC and 125Vdc Wires in Wireway
There is an unexpected requirement at site to wire in a 52b to dropout a 120VAC interposing relay coil after a successful breaker operation. Unfortunately, we ran out of spare cores on the 120VAC 4 core control cable from the switchgear to the VFD. The Digital Input control cable from the switchgear going to the VFD input card (for breaker status coming from a 52a dry contacts) has 2 cores spare. We are intending to use it for dropping the 120VAC interposing relay coil (via 52b) as mentioned above.
Since the cores are insulated to 600VAC, I believe I can combine the digital status input with the 120VAC control. I assume the digital status input is around 6Vdc powered by the VFD input card.
There is an RC snubber installed at the 120VAC interposing relay coil for arc suppression.
If we properly identify the wire tag of these cores to indicate 120VAC and say VFD input will the installation be technically acceptable?
RE: 120VAC and 125Vdc Wires in Wireway
RE: 120VAC and 125Vdc Wires in Wireway
RE: 120VAC and 125Vdc Wires in Wireway
"Theory is when you know all and nothing works. Practice is when all works and nobody knows why. In this case we have put together theory and practice: nothing works... and nobody knows why! (Albert Einstein)