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  • #16
    Re: 4 vs 3 conductor plugs for kitchen ranges

    this seems to be very interesting discussion
    plumbers in East London
    boilers in East London
    plumbing and heating in East London

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    • #17
      Re: 4 vs 3 conductor plugs for kitchen ranges

      People often think where the ground/neutral is bonded together is no big deal. The neutral is bonded at the service and redundantly bonding somewhere else downstream causes objectional currents and can overheat the neutral. In most cases where I find a burnt up wire, it a neutral.

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      • #18
        Re: 4 vs 3 conductor plugs for kitchen ranges

        The the netural wire (White) is a grounded wire but it is not the grounding wire. The grounding wire "Ground" (Green, Bare, Green-Yellow, etc) only has current flowing in a fault condition. The grounded wire (White/Netural) is at the same potential as the grounding wire (Ground/Green) but it will see an imbalance of the current between the two "Current Carriying Conductors" typically the RED and Black wires. In a balanced 220, 230, 240V circuit the netural current is "0". If the Red wire has 10A load on it and the Black wire has 20Aload on it there will be 10A flowing in the netural (Grounded Wire). There will be "NO" current on the grounding conductor!!!!! In the past the grounded wire and the grounding wire were bonded together inside the dryer or range. For most applications this would have been safe. Due to new techonology such as variable frequency drives, DC-DC Switching power supplies, etc which produce harmonic currents it is possible to see a small difference of potential (voltage) on the netural (Grounded wire) at the device. However checking the voltage at the source the potential would be "0" becasue the netural wire is grounded by bonding the neutral bus bar to the grounding conductor. Again because there is no current on the grounding wire execept in a fault conditon there is no harmonic currents present either. It can be argued there there is some minmal harmonic currents present on the grounding conductor. Typcally this is only durng a fault condition. This is why senstive electronic equipment use an orange hospital/commercial grade outlet. The color designates it as an isolated ground outlet. The ground is not provided by the conduit or other means. A properly wired isolated ground wire will have a decicated grounding conductor that connects directly to the main grounding location of the distrupution equipment.

        Important note!!!!!!!! Remove the bonding jumper inside an older ranger or washer that tied the netural to the chassis (metal) when using a seperate grounding conductor and grounded conductor (4 Wire Plug).

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        • #19
          Re: 4 vs 3 conductor plugs for kitchen ranges

          Originally posted by BHD View Post
          our well pit light was wired that way for many years, it worked well,

          I know of a local airport that still uses the earth as the netural for the runway lights. To save costs only one wire was ran for the 120V current carrying conductor (Hot). The netural or grounded wire is obtained from the stake that was in the ground to hold landing light. Not surprising the lights are dim when the ground is dry and very bright when it is wet. However on two 5000 foot strings of lights it did save money. I do belive the orginal wiring was done in the late 50 early 60's. It is just a small rural airport. As one can imagined it is not a FAA IFR approved lighting system but it serves it purpose for VFR flight at night.

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          • #20
            Re: 4 vs 3 conductor plugs for kitchen ranges

            I doubt it was using it as a neutral. Its probably using it as an earth ground which was common in the 50's. Using the earth as a neutral is not practical because of the massive voltage drop, especially at distances like that. But, a deteriorated neutral conductor could be aided by a wet condition between the ground rods.(Brighter lights)

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