ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 26 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
underfloor receptacles #86712
11/23/03 10:16 PM
11/23/03 10:16 PM
E
Elzappr  Offline OP
Member
Joined: Dec 2001
Posts: 270
Oregon
Here's the deal. Raised floors throughout a five storey building have hundreds of double duplex receptacles under them. There's a cob web of extra long plug strip cords running to the receptacles, through holes in the floor tiles. Now, this isn't a computer room situation, just regular office space. I know that the code prohibits cords running through tiles this way, and I suspect it is because you can't see the condition that the cord cap is in, as it is out of sight when plugged in under the floor tiles. All sorts of loose connection mischief can occur this way, and I'm wondering if anyone has any experience in the sort of problems caused by this sort of code violation.

2017 / 2014 NEC & Related Books and Study Guides
Re: underfloor receptacles #86713
11/24/03 08:56 AM
11/24/03 08:56 AM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I think that the original reason that flexible cords couldn't be concealed was that eventually, the cords insulation ages & becomes brittle and could actually fall off.

One of the troubles that may be encountered in this situation is that the cords could be damaged right where they pass through the raised floor panel. After all, if we were doing exposed Romex, we'd have to provide physical protection at this point.


Few things are harder to put up with than the annoyance of a good example.
Re: underfloor receptacles #86714
11/24/03 12:27 PM
11/24/03 12:27 PM
T
ThinkGood  Offline
Member
Joined: Aug 2002
Posts: 1,081
Milwaukee, WI
Just a side thought, is that area underneath considered a plenum? Would that change the equation?

Re: underfloor receptacles #86715
11/24/03 08:29 PM
11/24/03 08:29 PM
E
Elzappr  Offline OP
Member
Joined: Dec 2001
Posts: 270
Oregon
Not a plenum, just a continuation of room air space. No duct work or air flow under the floor tiles, just dead air space.

And yes, there is a probability of damaged cords. I've seen some of the floor openings with 3" plastic 'grommets', some without. And I've encountered several heavy boxes of paper jammed up on the cords. Looking under the tiles, I could see many cord ends semi-plugged in to the receptacles. They have about 5 duplex receptacles per 20 Amp circuit, and every available receptacle is used..so we have 10 plug strip cords running off of each 20 Amp circuit. These feed computer work stations, printers, and sometimes people think they need to put in a little space heater on the same circuit!


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 3,890
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
sparky 20
Admin 20
Potseal 13
Popular Topics(Views)
243,539 Are you busy
180,341 Re: Forum
170,830 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.035s Queries: 14 (0.021s) Memory: 0.9584 MB (Peak: 1.0891 MB) Zlib enabled. Server Time: 2018-01-18 19:54:02 UTC