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#108145 - 05/24/04 08:08 PM Strange Readings ....  
Admin  Online Content

Administrator
Member
Joined: Oct 2000
Posts: 3,447
NY, USA
Quote
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!

-Randy
[Linked Image]

[Linked Image]


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#108146 - 05/24/04 08:28 PM Re: Strange Readings ....  
CRM  Offline
Member
Joined: Feb 2004
Posts: 74
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 08:40 PM Re: Strange Readings ....  
Lostazhell  Offline
Member
Joined: Feb 2004
Posts: 1,431
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!

-Randy


#108148 - 05/24/04 08:42 PM Re: Strange Readings ....  
BigJohn  Offline
Member
Joined: Mar 2004
Posts: 391
Boston, MA
When I saw these photos my code book just burst into flames.

Randy,

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?

-John

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


#108149 - 05/24/04 08:47 PM Re: Strange Readings ....  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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
Massachusetts

#108150 - 05/24/04 10:11 PM Re: Strange Readings ....  
OreElect  Offline
Member
Joined: Mar 2004
Posts: 98
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 10:12 PM Re: Strange Readings ....  
OreElect  Offline
Member
Joined: Mar 2004
Posts: 98
Salem,Oregon.USA
Oh and I forgot to mention the free advice from the Home depot dude.


#108152 - 05/25/04 01:24 AM Re: Strange Readings ....  
stamcon  Offline
Member
Joined: Mar 2001
Posts: 329
So San Francisco CA
The line EGC is the smaller green conductor landed on the neutral bar [Linked Image]. The line grounded conductor(unidentified)is the one spliced with the blue wire nut [Linked Image]. The load grounded conductors are also black [Linked Image]. Green and white ungrounded load conductors [Linked Image]. At least the panel is a Square D [Linked Image](Homeline?).


#108153 - 05/25/04 06:40 AM Re: Strange Readings ....  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
[Linked Image]

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 07:56 AM Re: Strange Readings ....  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,260
Fullerton, CA USA
Randy,
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.

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


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