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Strain relief on drop cords. #9925
05/21/02 12:09 PM
05/21/02 12:09 PM
J
Joe Carpenter  Offline OP
Member
Joined: Dec 2001
Posts: 50
USA
In an industrial setting. 30amp 480volt Flexible Drop cords to supply power to machinery. These Cords must have Strain relief at the top.
My question, must the twist lock plugs which are located 6' off the floor also have special strain relief built in?
400.10 in the 2002 NEC does not go into a lot of detail.
What's your take?
Thanks

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Re: Strain relief on drop cords. #9926
05/21/02 09:33 PM
05/21/02 09:33 PM
R
rmiell  Offline
Member
Joined: Nov 2000
Posts: 242
La Junta, Co. USA
Joe, are you asking if the female end of the hanging cord needs strain relief? What strain would be imposed on the cord cap? Just the 6' cord from the unit?

I would think the strain relief on top will protect the cord from damage while hanging. The twist-lock plug and cap will not have much strain, at least not enough to damage anything.

What's your thoughts on this?

Rick Miell

Re: Strain relief on drop cords. #9927
05/22/02 05:24 AM
05/22/02 05:24 AM
J
Joe Carpenter  Offline OP
Member
Joined: Dec 2001
Posts: 50
USA
Yes, that was my question. I did'nt think it would be an issue although I recalled seeing strain reliefs on the female plug in several factories. It may have been a policy within the factory or perhaps the local AHJ specified them.

Re: Strain relief on drop cords. #9928
05/22/02 05:36 AM
05/22/02 05:36 AM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
I have seen strain relief where an outlet box was hung at the bottom of the cord drop. But I imagine the cord caps clamp would be adequate in your case.


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