ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Beyond Belief
by gfretwell - 09/26/20 06:31 PM
Questioning the electrical norms
by LongRunner - 09/23/20 06:38 AM
Smoke & mirrors?
by HotLine1 - 09/21/20 03:42 PM
Pool Lights?
by Papa - 09/18/20 05:26 PM
Ever been afflicted by Gout?
by mbhydro - 09/15/20 05:50 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 12 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 2 1 2
Re: 480 Open Delta voltage readings [Re: wewire2] #188466 08/10/09 05:22 PM
Joined: Jul 2004
Posts: 9,528
G
gfretwell Offline
Member
The winding between the 87 and 401v legs is shorted to the case is my bet. I bet the ohm readings are just about the same proportions too.


Greg Fretwell
Work Gear for Electricians and the Trades
Re: 480 Open Delta voltage readings [Re: wewire2] #188471 08/10/09 08:28 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
Greg,

The ground monitor would not help in this situation, since it is already known that there is a problem.

However, in the future, immediate attention could be given to the first ground fault. Ignoring the first ground fault can lead to more serious problems when a second ground fault occurs on another phase. These faults can have a fairly high impedance so OCPD's may not trip and fires can occur.

There is a listed product on the market that has the 3 lights and there are more sophisticated products which provide relay outputs. I, too, prefer an audible alarm since the building occupants may not realize the dangers involved. A light being out is easily ignored, but a horn sounding is not (of course, they might fill the horn with shaving cream to quiet it down).

For those interested, here's a pair of sites to visit
http://www.bender.org/irdh.aspx
http://www.atcdiversified.com/Diversified/GFD_series.htm


Few things are harder to put up with than the annoyance of a good example.
Re: 480 Open Delta voltage readings [Re: Tom] #188480 08/11/09 09:22 AM
Joined: Dec 2004
Posts: 329
I
IanR Offline
Member
" (of course, they might fill the horn with shaving cream to quiet it down)."

Round here it would usually be filled with a ball peen hammer wink

Re: 480 Open Delta voltage readings [Re: IanR] #188482 08/11/09 12:54 PM
Joined: Jul 2004
Posts: 9,528
G
gfretwell Offline
Member
Most common here is "Cut the red wire" (pool door alarms).


Greg Fretwell
Re: 480 Open Delta voltage readings [Re: wewire2] #188569 08/18/09 02:27 AM
Joined: Nov 2002
Posts: 244
W
wewire2 Offline OP
Member
Good call gentlemen!!! The motor in question, ran nice and cool and sounded normal. However....a meg test revealed it to be faulty.
Thanks a lot!!

Page 2 of 2 1 2

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
Potseal
Potseal
Saskatchewan
Posts: 264
Joined: February 2013
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 8
BigB 3
NORCAL 3
Popular Topics(Views)
270,046 Are you busy
204,436 Re: Forum
192,645 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3