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What Is The Answer?

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  • #16
    Re: What Is The Answer?

    Well, I just assumed it was a common 240 residential service...

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    • #17
      Re: What Is The Answer?

      I don't think he's coming back, it looks like he stumped all of us, and left. lol...
      Great Link for a Construction Owner/Tradesmen, and just say Garager sent you....

      http://www.contractorspub.com

      A good climbing rope will last you 3 to 5 years, a bad climbing rope will last you a life time !!!

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      • #18
        Re: What Is The Answer?

        testing testing

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        • #19
          Re: What Is The Answer?

          Originally posted by QROKING View Post
          testing testing

          What is it that you're testing?

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          • #20
            Re: What Is The Answer?

            -
            *
            Robert Wilber
            Licensed Philadelphia Electrician
            Philadelphia License # 3516 - 16765
            *
            Obviously posted by a civilian ..
            Obviously intended to be a 120/240 service as found in homes.
            Since loads are identical, the open neutral would not impact the appearance of the lamps, as the same current would flow through both with an equal voltage drop across each of the now series-connected lamps.
            A much more interesting question would be "what would be the resulting effect if there were FOUR, or TEN, 100 watt lamps on leg [obviously not phase] A and ONE 100 watt lamp on leg B?"
            [Clue: this is why TVs burn up when you lose your neutral!]
            http://wilberelectrical.blogspot.com/
            Licensed Philadelphia electrician
            Philadelphia emergency lighting certification

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            • #21
              Re: What Is The Answer?

              On a Single Phase 120/240 service, the 2 "legs" are commonly referred to as phase "A" and phase "B" as well as Leg "A" and Leg"B". Generally I hear the term "phase" more often, though it may be a misnomer. Lou

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              • #22
                Re: What Is The Answer?

                Robert's circuit is an interesting and wild one. That's why it's super important to have good electrical connections. When a neutral becomes disconnected some very wild and nasty things can sure happen. I have to get working on drawing up a few circuits and scan them. I'll post a few pictures and see how many of you have your thinking caps on. One of them will get everyone laughing once you figure it out.

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                • #23
                  Re: What Is The Answer?

                  no electrician has looked at this yet im guessing. if you remove neutral lights go off no matter what
                  how is it that so many answers are in the instructions

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                  • #24
                    Re: What Is The Answer?

                    Originally posted by proplumb View Post
                    no electrician has looked at this yet im guessing. if you remove neutral lights go off no matter what
                    Hope by your screen name that you are a plumber and not an electrician.

                    Have a closer look, think of the two lights as as one across a 240V source
                    Last edited by wbrooks; 03-28-2007, 08:06 AM.

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                    • #25
                      Re: What Is The Answer?

                      PROPLUMB....keep to your plumbing. The right answer was given already with explaination. Cut the wire and nothing happens the lights stay the way they were.

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                      • #26
                        Re: What Is The Answer?

                        Originally posted by QROKING View Post
                        PROPLUMB....keep to your plumbing. The right answer was given already with explaination. Cut the wire and nothing happens the lights stay the way they were.
                        ditto!

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                        • #27
                          Re: What Is The Answer?

                          Originally posted by fkaufman View Post
                          Since the voltage between Phase A and Neutral and Phase B and Neutral are the same, the voltage between phase A and Phacse B is double of what it would be between each of the Phases and Neutral.

                          As the bulbs are identical (both 100W), when Neutral gets disconnected they become connected serially between the two phases.

                          Therefore the bulbs will be burning with the exact same intensity as when Neutral was connected, so none of the above is the correct answer.

                          Looks like mot got it right as in no difference.It looks pretty plain to me that it is a 120/240 volt single phase system.But if one bulb burns out it will turn the other off also.

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                          • #28
                            Re: What Is The Answer?

                            Nothing happens.

                            shup

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                            • #29
                              Re: What Is The Answer?

                              It's a no brainer, wbrooks is correct, answer is E.

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                              • #30
                                Re: What Is The Answer?

                                I'm new to this forum so I thought I would also add to this...I've not gone through all the responses - just a few.

                                I'm not an electrician but I wonder why the Phase A and Phase B are named as such. Without knowing the phase relationship between A and B you cannot answer this question - so from that point of view E would be the answer since it says none of the above.

                                Assuming phase A and Phase B are 120V, 180 degree out of phase then I agree that cutting neutral will not affect the result - both bulbs will continue to burn since the return current will always choose the path of the lower potential which is the leg 180 out of phase.

                                I saw someone had posted that if one bulb burns out the other will not light. I cannot see that myself - if that happens the return current will travel via the neutral line and the other bulb should stay lit.

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