Recent content by bluie3

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    Calculating main switch size

    I should have also stated that I am a sparky, but ive always worked for the huge companies where all the selection is done, and we just get the materials and are told to install. I will be running the new circuit, with 6mm cable, but as I didnt do the house install, and ive never been there, I...
  2. B

    Calculating main switch size

    My friend, a plumber is at a job with a 63A 3 phase main switch, and the board has a few 20a circuits, a few 10a, and a few 32a. Hes replacing the 20a double pole breaker from the old water heater to a 3 phase 40a breaker, to suit the new heater. What is the formula/calculation to determine the...

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