4 ms·

Likely due to neutral not being tied to a cold water pipe.

• aequitas 4y ago
  In my country (NL) it is advised against that (though it used to be common practice), since a bit of water pipe running from your house might have been replaced with a plastic one and the metal bit still sticking out into your house might not have the proper ground resistance to function as a proper earth wire.
  • bluGill 4y ago
    The US used to allow metal pipes to be counted as a ground connection, but not anyway. The US requires metal pipes be connected to ground, but that is not the same as the neutral to ground connection.
  • CodeWriter23 4y ago
    Look down and see if the metal pipe is going into the ground? At least in cases where the different services enter the premise in close proximity.
    • aequitas 4y ago
      Metal touching the ground does not guarantee a proper earth. The resistance might be to high to function properly under all circumstances a ground is needed.