ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Tingle off the water spigot
by dsk. 10/15/18 02:36 PM
Board tester power supply?
by JoeTestingEngr. 10/13/18 12:14 AM
Voltage sag
by Trumpy. 10/12/18 06:59 PM
220/230/240V 60Hz Systems
by Trumpy. 10/12/18 06:50 PM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/10/18 08:47 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 50 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
CAT 6 minimum radius #212657
01/30/14 01:00 PM
01/30/14 01:00 PM
C
cgw  Offline OP
Member
Joined: Jul 2004
Posts: 133
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?

Study Guides for VDV / Structured Cabling Installers

Voice, Data, Video, (VDV) Fiber Optics, Communications, Low Voltage,
Fire Alarm, Electronic Security Systems Installations & Related

NTC Low Voltage Training & NICET Exam Study Guides
Low Voltage Training & NICET Exam Study Guides

Re: CAT 6 minimum radius [Re: cgw] #212658
01/30/14 02:08 PM
01/30/14 02:08 PM
W
WESTUPLACE  Offline
Member
Joined: Mar 2004
Posts: 251
Kingwood, TX USA
4 times the diameter of the cable is the min, for regular bends 50mm is the min.

Re: CAT 6 minimum radius [Re: cgw] #212660
01/30/14 07:15 PM
01/30/14 07:15 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
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.

%%%


Last edited by Tesla; 01/30/14 07:17 PM.

Tesla

Featured:

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

 

Member Spotlight
Admin
Admin
NY, USA
Posts: 3,516
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,258 Are you busy
187,911 Re: Forum
177,445 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.025s Queries: 15 (0.005s) Memory: 0.9555 MB (Peak: 1.0810 MB) Zlib enabled. Server Time: 2018-10-15 19:22:02 UTC