Cables-3C and 3-1C
Cables-3C and 3-1C
(OP)
I have an application that I need to feed a 5MVA-27.6 Kv transformer through a switch. I can use a 3 X 1C cable or a 3C cable . I believe code has installation restrictions for non-armoured cables to be either inside a conduit or inside an enclosed cable trays.
Beside bending issue that we might have with triplex cables , what are other major concerns to consider when picking between triplex and 3 X 1C cables?
Beside bending issue that we might have with triplex cables , what are other major concerns to consider when picking between triplex and 3 X 1C cables?






RE: Cables-3C and 3-1C
Installed cost.
Special treatment for three conductors to address sheath currents and eddy currents in enclosure iron.
Bill
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"Why not the best?"
Jimmy Carter
RE: Cables-3C and 3-1C
RE: Cables-3C and 3-1C
If you run three single-conductor armored cables and ground the three armor terminations at each end it will create circulating currents.
Three conductor armored cables should not create circulating currents.
RE: Cables-3C and 3-1C
So if we replace the existing 3-1C cables with a 3C cables (as per attached) then we need to ground the " Tape Shield (E)" at both locations right? considering the short distance, I assume the cirulting wire is not an issue.
"Ground Conductor (G)" acts as a bonding conductor.