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!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
230 or 345 kV transmission lines?
by Vlado
Yesterday at 09:33 AM
breaker meltdown
by crselectric
Yesterday at 12:42 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 17
gfretwell 9
sparky 9
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 245 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#212657 - 01/30/14 09:00 AM CAT 6 minimum radius
cgw Offline
Member

Registered: 07/29/04
Posts: 133
Loc: Rochester NY
For a conduit installed for data cable (e.g. conduit from wall box up to above ceiling) - What should the minimum radius of the elbow be?

Top
Study Guides for VDV / Structured Cabling Installers
#212658 - 01/30/14 10:08 AM Re: CAT 6 minimum radius [Re: cgw]
WESTUPLACE Offline
Member

Registered: 03/29/04
Posts: 252
Loc: Kingwood, TX USA
4 times the diameter of the cable is the min, for regular bends 50mm is the min.

Top
#212660 - 01/30/14 03:15 PM Re: CAT 6 minimum radius [Re: cgw]
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: Sacramento, CA
Radius in such situations is almost never an issue.

The crippler is the size of the conduit.

Typical minimum for trivial need: 3/4"

Robust data-com spec out 1 1/4" drops -- for which j-boxes are in mass production (yet special order from your distributor -- such big KOs have to be spec'd) (4-11s)

It's not uncommon for the drops to have no elbow at all. Instead, the drop is a sleeve capped by a plastic bushing -- typically a white nylon style -- Arlington pitches theirs all the time in EC Magazine.

It's common for the spec's to call out for bushed entries, BTW. Bare pipe won't do.

%%%%

Eriksen sells a bender that kicks out mild sweeps in EMT.

It's popular in the data-com world, too.

http://www.ericksenbender.net/

This is usually a company tool. Its sweeps are so gentle that it's possible to go to down a size for data-com sweeps. (ie, 1" replaces 1 1/4") If you do this often enough, then the bender pays for itself.

[ Note: downsizing data-com drops is only possible if you've got the data-com contract. In all other cases, you're in the blind -- and will have to follow the contract spec's. These are usually worked up on the most conservative (oversized) basis so that the writer doesn't get bit by final results.]

%%%

In all cases, never attempt to get away with 1/2" EMT.

%%%



Edited by Tesla (01/30/14 03:17 PM)
_________________________
Tesla

Top



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