ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
Dimmable LED 2x4 lay in fixtures
by Potseal. 04/23/17 07:18 PM
Old decora style outlets
by Lostazhell. 04/22/17 07:59 PM
Permit Snafus...AHJs and Contractors Jump in
by gfretwell. 04/22/17 01:11 PM
How do you find a good employee?
by HotLine1. 04/22/17 10:44 AM
Electrode boilers question
by SteveFehr. 04/21/17 08:32 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,494 Are you busy
169,159 Re: Forum
162,509 Need opinion
Who's Online Now
2 registered members (Potseal, NORCAL), 73 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#129656 - 06/28/05 11:30 PM Shorted pilot wire in a 15KV trailing cable.  
shovelelectrician  Offline
Junior Member
Joined: Jun 2005
Posts: 1
Anyone familiar with trailing cable? I have a 15KV shielded cable with 3-1/0 phase conductors, 2- bare ground wires, and a #8 pilot wire. I meggered the pilot to ground 0ohms@500V Shorted. I then checked it with a circuit seeker but it showed an open circuit. So it's a insulation problem with the pilot wire. My question is: Can I use a thumper on such a small wire?(I think I know the answer to that) If not what can I do to pin point the fault? Aside from cutting the cable in halves and using the process of elimination. Any suggestions would be great. Thanks.


Tools for Electricians:

#129657 - 08/04/05 06:46 PM Re: Shorted pilot wire in a 15KV trailing cable.  
pdh  Offline
Member
Joined: Jan 2005
Posts: 354
A testing device called a "time domain reflectometer" could be used to find the distance to a short. It is normally used on coaxial cable to find where cable damage is that changes the characteristic impedance. A short is a (drastic) change in impedance. This isn't the kind of thing electricians would generally have. But if you know any electrical engineers, especially those that work in RF, they may have one you could borrow.

Example products:
http://tinyurl.com/7jle5



Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.009s Queries: 14 (0.002s) Memory: 0.7420 MB (Peak: 0.8605 MB) Zlib enabled. Server Time: 2017-04-23 23:42:39 UTC