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

Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#108145 - 05/24/04 05:08 PM Strange Readings ....
Webmaster Offline


Registered: 10/07/00
Posts: 3142
Loc: NY, USA
I went out to troubleshoot some tennis court lighting at a LARGE house & was curious why I was getting 240V between ground & neutral! I'll let the pics explain themselves.. Gotta love the mounting job on the sealtite!


2014 / 2011 NEC & Related Books and Study Guides
#108146 - 05/24/04 05:28 PM Re: Strange Readings ....
CRM Offline

Registered: 02/29/04
Posts: 73
Loc: Alberta Canada
Let me take a guess, that neutral which is spliced in the panel came loose, or was the bonding screw, which bonds the neutral to the panel left in by mistake.

[This message has been edited by CRM (edited 05-24-2004).]

#108147 - 05/24/04 05:40 PM Re: Strange Readings ....
Lostazhell Offline

Registered: 02/21/04
Posts: 1248
Loc: Bakersfield, CA (Originally Or...
CRM.... I opened a jbox down the line from here & noticed my hotstick lit up on the white & green wires... metered them & got 240V... Someone didnt seem to understand what colors to use for hots when this was installed!


#108148 - 05/24/04 05:42 PM Re: Strange Readings ....
BigJohn Offline

Registered: 03/06/04
Posts: 352
Loc: Boston, MA
When I saw these photos my code book just burst into flames.


Do you know who in the world did that work? What were you trouble-shooting?

Is that undersized green conductor being used as the line-side neutral?
Where are any EGCs?
Where's the equipment ground bus?


[This message has been edited by BigJohn (edited 05-24-2004).]

#108149 - 05/24/04 05:47 PM Re: Strange Readings ....
iwire Offline

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
The mis-use of colors is a concern but what really worries me is I see no grounding conductor heading out the LT.

Or do I see a black 12 AWG as the grounding conductor for 30 amp circuits?

[This message has been edited by iwire (edited 05-24-2004).]
Bob Badger
Construction & Maintenance Electrician

#108150 - 05/24/04 07:11 PM Re: Strange Readings ....
OreElect Offline

Registered: 03/05/04
Posts: 96
Loc: Salem,Oregon.USA
Good one Bigjohn,code book burst into flames!lol
Yea,that job looks like home owner Bob and shade tree neighbor job, I`ll bet his wife was impressed though.My hubby can do anything,Dont you just love it.

#108151 - 05/24/04 07:12 PM Re: Strange Readings ....
OreElect Offline

Registered: 03/05/04
Posts: 96
Loc: Salem,Oregon.USA
Oh and I forgot to mention the free advice from the Home depot dude.

#108152 - 05/24/04 10:24 PM Re: Strange Readings ....
stamcon Offline

Registered: 03/24/01
Posts: 322
Loc: So San Francisco CA
The line EGC is the smaller green conductor landed on the neutral bar . The line grounded conductor(unidentified)is the one spliced with the blue wire nut . The load grounded conductors are also black . Green and white ungrounded load conductors . At least the panel is a Square D (Homeline?).

#108153 - 05/25/04 03:40 AM Re: Strange Readings ....
pauluk Offline

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England

Just how much lighting is out there, that needs two 30A 240V circuits plus another 120V circuit? (Is that 20A on the single-pole breaker? Can't quite make it out on my monitor.)

#108154 - 05/25/04 04:56 AM Re: Strange Readings ....
electure Offline


Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Where were the conductors landed on the load side?
It seems like anyone with the smarts to use the oversize conductors should have had the smarts to know about the grounding/grounded conductor stuff.
Homeline is the "Premier" brand available at our Home Depots, BTW.

Most of the 3/4" LTFMC we use is listed as an equipment grounding conductor up to 60 Amps, 1/2" to 20 Amps.

Page 1 of 3 1 2 3 >

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