ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#9925 - 05/21/02 10:09 AM Strain relief on drop cords.
Joe Carpenter Offline
Member
Registered: 12/19/01
Posts: 50
Loc: 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
Top
Work Gear for Electricians and the Trades
#9926 - 05/21/02 07:33 PM Re: Strain relief on drop cords.
rmiell Offline
Member
Registered: 11/09/00
Posts: 242
Loc: 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
Top
#9927 - 05/22/02 03:24 AM Re: Strain relief on drop cords.
Joe Carpenter Offline
Member
Registered: 12/19/01
Posts: 50
Loc: 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.
Top
#9928 - 05/22/02 03:36 AM Re: Strain relief on drop cords.
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: 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.
Top

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 50 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 79
HotLine1 51
Ruben Rocha 29
gfretwell 25
Trumpy 20
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals