The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
International Wire Colour Codes
by Texas_Ranger
Today at 08:24 AM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
renosteinke 6
HotLine1 6
ghost307 5
Potseal 4
Who's Online
0 registered (), 216 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#93014 - 04/25/05 04:43 AM Tray Cable/ IT room floors
Dnkldorf Offline

Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
2 Questions.

1. 645.5(d), type mc cable can be used in raised floors in IT rooms.

Is this right? I thought it all had to be liquidtight.

Or am I missing the section somewhere that if water lines are under the floor, it all has to be liquidtight.

2. Where do I find where Thhn is cable tray rated? I was at a lumber mill the other day and noticed what I thought was 500mcm in cable tray. Single conductors, not tray cable.

Any help appreciated.


2014 / 2011 NEC & Related Books and Study Guides
#93015 - 04/25/05 05:07 AM Re: Tray Cable/ IT room floors
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
I'm reading in 310.11(B) that conductors such as THHN if suitable for Tray Cable need to be marked TC every 40 inches on the surface of the insulation. There are other marking options for multi conductor cables and all this is spelled out in 310.11.
George Little


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