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#106834 01/19/05 10:16 PM
Joined: Oct 2000
Posts: 3,661
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(submitted via Joe Tedesco)
Quote
I have a question pertaining to the use of flexible cords in a manufacturing environment. My area of expertise is safety and health for general industry and during inspections and audits at our facilities throughout the US, I find the use of flexible cords as an area of great concern.

During a recent visit to one of our manufacturing sites I spotted what I feel are clear cut violations of OSHA regulations and the NEC, however the electrical contractor that installed the wiring insists that his work meets code. This flexible wiring is primarily used to power outlet boxes and permanently installed equipment.

Michael J. Tanke
Strain Relief:

[Linked Image]

[Linked Image]

Outlet Box Wiring:

[Linked Image]

[Linked Image]

Wiring Method:

[Linked Image]


[This message has been edited by Webmaster (edited 01-19-2005).]

2017 / 2014 NEC & Related Books and Study Guides
#106835 01/19/05 10:19 PM
Joined: Oct 2000
Posts: 3,661
Likes: 1
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Suspended Outlet Boxes:

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

Flexible wiring at ceiling:

[Linked Image]

#106836 01/19/05 10:21 PM
Joined: Oct 2000
Posts: 3,661
Likes: 1
Admin Offline OP
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Flexible cord to electrical panels:

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

Flexible cord use:

[Linked Image]

#106837 01/20/05 12:51 AM
Joined: Dec 2000
Posts: 4,287
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Was a permit pulled for his work?

#106838 01/20/05 03:13 AM
Joined: Jul 2003
Posts: 394
B
Member
Who's code? Not the NEC for sure.

#106839 01/20/05 07:09 PM
Joined: Jul 2002
Posts: 8,407
Likes: 2
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Hanging what looks like poly-phase cords from a roof, without adequate support sets up a bit of a dangerous precedent.
What annoys me more, when this standard of work is installed by an EC, some workers on site, get the idea that this is how things are done.
This guy's work just screams "I don't give a ****!".
Or "I'm not smart enough to use real wire and conduit". [Linked Image]

{Message edited for spelling errors}

[This message has been edited by Trumpy (edited 01-20-2005).]

#106840 01/20/05 07:33 PM
Joined: Aug 2004
Posts: 51
B
Member
I used to work in a manufacturing plant, and now work in a food processing plant. Flexible cord is often used (wrongly) as a substitute for a fixed wiring method. If the equipment is frequently moved, that's one thing...

In these pics we see fittigs that are intended for armored or metal-clad cable used with flex cord. Unfortunately, I was taught to do this. I now use prpoer fittings for cords.

The 4sq. handy box hanging in mid-air is listed to be mounted permanently.

Some strain reliefs and cord grips, but, some of the wiring methods and uses of cords look real low-budget.

#106841 01/20/05 10:15 PM
Joined: Jan 2002
Posts: 324
A
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S.O., S.O., Its off to work we go!

#106842 01/20/05 10:51 PM
Joined: Apr 2001
Posts: 518
J
Member
I hate to say this, but the intall might actually be legit, if messy looking.
Drop cords....those plugs coming down from the ceiling...are a common way to power machinery. It works very well, and often places the cord in a place where it's out of the way (how often have you tripped over a pipe or raceway set on the floor?).
The two-screw connectors are actually listed for connecting flexible cords...look at the note on the box they come in.
The prohibition of flexible cord above a dropped ceiling dates from 2002...so that would be OK if older than that.
Many of the cords look as if they came with the machines- in which case using them is proper.

Several of the parts used are not cheap, and show some attention to detail.

One area of possible concern....flexible cords can not be uses as a substitute for permanent wiring (400.8(1)). The long run across a ceiling may be such an area of violation. (Drop cords typically drop straight down, not run horizontally).

I can't find it right now (someone help me here!), but I know that the NEC also requires pendant boxes to have the cord enter through a threaded hub...so the use of the 4-square boxes is a violation.

#106843 01/21/05 08:19 AM
Joined: Dec 2000
Posts: 4,287
Member
'99 - 370.23(h) '02 - 314.23(H)

(1) Flexible Cord. A box shall be supported from a multiconductor cord or cable in an approved manner that protects the conductors against strain, such as a strain-relief connector threaded into a box with a hub.

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