Securing 4160 cables inside of MCC.
Securing 4160 cables inside of MCC.
(OP)
Hey Experts,
I have been asked by a customer if this is kosher?
Where one may usually find more elaborate clamping and bracing of 4160v cable terminations, just past this a "METAL HOSE CLAMP" is used to group the cables on the internal routing to lugs. I see no obvious problem, everything is wrapped etc, but what about cable sheath damage possibilities. I don't exceed 1000v, meaning 480v as per company rules.
EVER SEEN HOSE CLAMPS USED?
I have been asked by a customer if this is kosher?
Where one may usually find more elaborate clamping and bracing of 4160v cable terminations, just past this a "METAL HOSE CLAMP" is used to group the cables on the internal routing to lugs. I see no obvious problem, everything is wrapped etc, but what about cable sheath damage possibilities. I don't exceed 1000v, meaning 480v as per company rules.
EVER SEEN HOSE CLAMPS USED?






RE: Securing 4160 cables inside of MCC.
But either way, metal hose clamp... bad. Everything looks OK now, but have you ever watched cables during a fault, or even a large current surge like a large motor starting? There is a LOT of force exerted, a metal hose clamp could easily cut through the insulation and create a new fault. metal cable clamps have rounded edges so as to avoid that.
I believe also that it would be a Code violation. If nothing else, Article 100 under the definition of Identified:
So if you can show that it is INTENDED to be used as a cable clamp, OK. If not, not OK.
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RE: Securing 4160 cables inside of MCC.
RE: Securing 4160 cables inside of MCC.
Why not use a nylon strap?
RE: Securing 4160 cables inside of MCC.
Don't ask me to EVER repeat that lunacy either. I had to pinky swear with my technician to never ever tell this story (sorry Hans if you're reading this and recognize it). We knew what we were doing was foolishly dangerous, but we were stuck in the middle of a miserable place and not allowed to leave until we solved the problem, we did NOT want to stay another day. We were very far away from the equipment when observing it, but still, I'm not unaware of how lucky we were to have come away with no scars.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Securing 4160 cables inside of MCC.