test your circuit before connecting to breaker

Discussion in 'Electrical Forum discussion & Blog' started by Ford2001, Nov 3, 2009.

  1. Ford2001

    Ford2001 New Member

    Messages:
    44
    Location:
    Manchester, Vermont
    Recently an old time electrician call me, and since we were good friends,
    he want to show me something he does, before connection, the Power
    Circuits also call home runs, to the electrical panel circuit breaker./

    Here were only talking about single pole breakers.

    One breaker feed a stranded duplex receptacle.

    The 2nd. breaker feed to the line side of a GFCI duplex receptacples.

    This is was one of those D.I.Y. wiring jobs, were the D.I.Y. didn't want
    to tie in all the circuits into the electrial panel. So he call old Pete,
    and Pete, said okay.

    Here what Pete does before connecting a circuit to the electrical panel/\.
    He wire nuts the end of NM-B cable to a cord set without a female end.

    He then ties white/white, black/black & ground/ground and plugs it into
    a normal breaker receptacle. This was a test. If the circuit pass this
    this test, he would then plug the circuit into the receptacle protected
    by a GFCI. So far on this job, 90% of the circuits were passing.

    But when I arrive at his job, he said watch this. He plug into normal
    receptacle, and it pass this part of his test. NOW, when plug, into the
    GFCI protected receptacle, the GFCI click off.

    Then Pete look at me and said, D.I.Y.'s only care that the circuit will bring
    power to the light outlets and the power receptacles, they don't care
    of they wire the electrical properly.

    Pete found the problem. Correct the wiring, and the GFCI test receptacle
    held this time.

    Pete would tell me what he did, he said I should go home and study, and
    tried to come up with a answer.
  2. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    This sounds like a homework problem. I don't think anyone here will answer it for you. Why don't you take a stab at it and then we'll help w/ the answer?
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,311
    Location:
    Cave Creek, Arizona
    test

    I cannot see where that test does anything that a continuity/ohmmeter would not, and without having to wire it to an extension cord.
  4. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Messages:
    2,780
    Location:
    USA
    I'm guessing a test for reverse polarity.

    I just take care with what I am doing.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,311
    Location:
    Cave Creek, Arizona
    reverse

    Unless you are using a tester that checks between the hot, neutral, and ground, you will not find reversed polarity by plugging a circuit into a hot line.
  6. frenchie

    frenchie Jack of all trades

    GFI's test one thing, and one thing only.

    But I agree with Jason:

  7. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    Someone on another site was posting questions - also homework questions
  8. drick

    drick In the Trades

    Messages:
    392
    Hmm, this is a somewhat difficult homework question IMO. Although the answer is in the question itself someone without practical experience might not realize it.


    >>Then Pete look at me and said, D.I.Y.'s only care that the circuit will bring
    power to the light outlets and the power receptacles, they don't care
    of they wire the electrical properly.

    -rick
  9. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    Yup.

    Guy never even came back ... probably because we didn't give him the answer.
  10. Ford2001

    Ford2001 New Member

    Messages:
    44
    Location:
    Manchester, Vermont
    Why did the Test GFCI receptacle trip

    I write this now, because I felt I didn't write my original Thread very well.
    I left out something. I believe it was, that Pete was wiring new circuits
    into the house existing panel box.

    The second thing left out, was there were two circuits inside one outlet
    box. One circuit was pre-exisiting and feed power to a receptacle used
    by a basement sump pump. The 2nd. circuit, new, was being splice at
    this outlet box. This is a new circuit, and the one that trip the GFCI.

    I asked Pete was the sump pump circuit was on at the time of his test, he
    said it was off.

    What I know about GFCI's is that they measure current on both legs of
    a 120 volt circuit. But with no load on either of the two circuits, and
    just the new circuit splice inside the sump pump, outlet box, why did the
    GFCI test receptacle trip. :confused:

    Thanks to everyone who took a look at this Thread. I am very sorry that
    I left out some details, now looking back might have been helpful in solving
    this riddle.
Similar Threads: test circuit
Forum Title Date
Electrical Forum discussion & Blog Proper way to test circuit safety Oct 14, 2012
Electrical Forum discussion & Blog Circuits are testing way over voltage Jun 22, 2010
Electrical Forum discussion & Blog Resi Circuit Breaker test plan, comments please Nov 20, 2008
Electrical Forum discussion & Blog Testing a Soun Touch floor heat mat. Mar 11, 2012
Electrical Forum discussion & Blog 240 2pole30amp breaker testing Aug 29, 2011

Share This Page