residential underground service, 120/240 v0lt single phase. How low can meg ohm be between hot phase and ground before considering replacing?

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  • 4 weeks ago

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  • Anonymous
    1 month ago

    Did you measure? 

    What is the reading?

  • 2 months ago

    At least more than 1M ohms, set ohm tester voltage rate at 1000Vdc.

  • 2 months ago

    Anything higher than 1 Meg is good.

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  • 2 months ago

    Trying to measure leakage between a phase and and ground?  Since this feed is before you local meter, it's not something for you to worry about - if the leakage is too high it is something the power company will want to address.  If you are observing specific 'symptoms' that you think may be related to the feedline, inform the power company. 

  • 2 months ago

    You need to figure out the wire size and material, then look up the wire resistance per ft and calculate accordingly. Say for example it is 3/0 Aluminum, according to Table 8 Conductor properties in the NEC, it is 0.126 ohms/kFT. If your cable length was 125 feet, it should be 0.016 ohms.

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