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
1 registered members (LongRunner), 10 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
cable tray #101620
03/27/02 03:14 AM
03/27/02 03:14 AM
S
SamC  Offline OP
Member
Joined: Mar 2002
Posts: 15
Canada
Teck cable,in verticle runs of cable tray, do cables need to be P-Clamped? We hired a fresh j/m out of school last summer and he mentioned this was now code. I never thought anything of this (because I was not on that job), til last month. When I ty-wrapped teck down a verticle run and was remined of this so called rule by the shop leadhand. He said the new guy must know the rules, He just came from school. I found nothing in the CEC. Am I missing something?

Tools for Electricians:
Re: cable tray #101621
03/27/02 05:37 PM
03/27/02 05:37 PM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
No answers here....just more questions.

What is a P-clamp?

I have always ty-wraped cables in cable tray and have not seen it done any other way.

GJ

Re: cable tray #101622
03/27/02 11:42 PM
03/27/02 11:42 PM
S
SamC  Offline OP
Member
Joined: Mar 2002
Posts: 15
Canada
P-clamps are steel clamps used to secure cables and pipe to strut or tray. There are 2 types we use at our plant, one is U shaped with a saddle on the inside of the U, you would slip the clamp over the cable hook the open end on the tray rung or strut and tighten the saddle down with the screw that is attached to the clamp. The other style is a 3 piece unit. If you have access to the Unistrut Catalogue you should find them there.

Re: cable tray #101623
03/28/02 04:44 PM
03/28/02 04:44 PM
T
Tony Moscioni  Offline
Moderator
Joined: May 2001
Posts: 144
CANADA
Rule 12-120(2)

Conductors in vertical raceways shall be supported independently of the terminal connections and at intervals not exceeding those specified in Table 21 and such supports shall maintain the continuity of the raceway system without injury to the conductors or their covering.

Intent for Rule 12-120(2).

We intend that the weight of conductors, when mounted in the vertical position, not be supported at electrical equipment terminations. When the weight is considerable, the top support alone should not be relied on; intermediate supports should also be used. Conductors installed in vertical raceways are to be supported in accordance with Table 21.

Field Considerations for Rule 12-120(2).

There are types of single- or multi-conductor cables that because of their construction have, when run vertically, similar problems as conductors installed in vertical raceways. The cable manufacturer should be consulted to determine the maximum vertical run between conductor supports, or cables specifically designed to be run vertically should be used.


Tie wraps are intended and approved for securing cables and conductors in place for spacing, but not for supporting them.

This means tie wraps may not bear any weight.

Tie wraps are not permitted to support cables in vertical sections of cable tray.
Tie wraps may be used in horizontal sections of cable tray to maintain cable spacing.

Tie wraps shall be suitable for the environment (indoor, outdoor, sunlight, etc)

Tony Moscioni
Electrical Inspector
Electrical Safety Authority

Re: cable tray #101624
03/28/02 07:32 PM
03/28/02 07:32 PM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Sam, thanks for the info....I'll check it out.

GJ

[This message has been edited by golf junkie (edited 03-28-2002).]

Re: cable tray #101625
03/31/02 11:50 AM
03/31/02 11:50 AM
S
SamC  Offline OP
Member
Joined: Mar 2002
Posts: 15
Canada
Thanks Tony I'll pass this on to the guys in the shop. I do have couple of questions though, 1>what about a verticle run that is used only to change the tray elevation say 15', or 2>a 10' drop into top of cabinate? In these 2 examples the termination at equipment will not be supporting any wieght.

Sam


Featured:

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

 

Member Spotlight
Tom
Tom
Shinnston, WV USA
Posts: 1,044
Joined: January 2001
Show All Member Profiles 
Top Posters(30 Days)
sparky 20
Admin 20
Potseal 13
Popular Topics(Views)
243,537 Are you busy
180,340 Re: Forum
170,827 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 14 (0.003s) Memory: 0.9749 MB (Peak: 1.1215 MB) Zlib enabled. Server Time: 2018-01-18 11:53:26 UTC