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  1. #40
    Join Date
    Mar 2008
    Location
    North Queensland, Australia
    Posts
    1,051
    Quote Originally Posted by SBKold View Post
    Timebuilder I have wondered this for some time now - about the seperate neutral 4 wire range and dryer cords.

    I understand what you mean about not using ground as current path.

    At the dryer electrical connection there is a jumper from ground to neutral so what did this really accomplish?
    From what I've read here I assume you don't use residual currant devices much over there?

    The more I learn about the power reticulation system used in the States, the more it horrifies me.

    We joke about using the earth wire as a neutral return path over here but nobody would actually do it.

    It sounds positively 19th century...
    Mistakes are a part of being human. Appreciate your mistakes for what they are: precious life lessons that can only be learned the hard way. Unless it's a fatal mistake, which, at least, others can learn from. Al Franken, "Oh, the Things I Know", 2002

  2. #41
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,948
    Quote Originally Posted by Slatts View Post
    From what I've read here I assume you don't use residual currant devices much over there?

    The more I learn about the power reticulation system used in the States, the more it horrifies me.

    We joke about using the earth wire as a neutral return path over here but nobody would actually do it.

    It sounds positively 19th century...
    In the US, the neutral is a grounded conductor, and the service neutral is bonded to an earth electrode for surges and lightning.

    Earth can never be used in place of a neutral to the power transformer. Here, that neutral is a transformer secondary center tap, so that the full secondary voltage is 220v, and one end of the secondary referenced to the center tap is 120v, which is our basic residential voltage for lighting and small appliances. We send the two ends of that transformer secondary and the center tap neutral from the pole to the home. A two pole breaker provides 220v, and a single pole breaker referenced to the neutral gives 120 volts.

    Does that help?
    [Avatar photo from a Florida training accident. Everyone walked away.]
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    RSES CMS, HVAC Electrical Specialist

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  3. #42
    Join Date
    Feb 2011
    Location
    OH
    Posts
    149
    3 phase moter will have resistance the same on all 3 legs .If not moter bad ,which i worked on a older trane which was a 208 230 volt 3 phase which hinding in the corner was a step up transfprmer 460 v 1 phase .running condenser fan '

  4. #43
    Join Date
    Jan 2008
    Location
    LEHIGH VALLEY, PA
    Posts
    161
    archaic is a good word , do not see rcd, s, still see lots of fuses of all styles on main supplys , do not even see disconnects ( isolators ) next to equipment , a recent service call at a hospital to replace a thermostat on a freezer room , two seperate systems but a single stat mechanical type double throw, so to isolate requirers access to the roof 3 floors up and a key to access the roof and a ride in the elavator and a lot of walking from one end of roof to the other , and you need to turn off both sets of equipment as you dont know which is the supply to the stat , by the way in evey call i make if you want to start a manual defrost , you also need to find the condensing unit which is inevetiably on a roof 20 ft high is common , as the clock and i mean the old style paragon type is still in daily use here isalways locted at the condensing unit , they have not heard of a control panel defrost control etc and an isolator adjacent to the freezer room , , some of there stuff takes alot of getting used to , and then there are wild legs but that is a different story ,

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