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  1. Gaggsy

    Circuit Calculations

    I have a 40A circuit breaker on a switch board which supplies a 220V distribution board, the 3 phases of the 40A breaker pull 6.3A, 4.6A and 7.2A. Can I just add these together to find the total current being pulled by the DB?
  2. Gaggsy

    Circuit Protection Calculation

    I have a 220V circuit board protected by a 75A breaker, I wish to install 2 new breakers, how do I work out if I need to up the 75A breaker?
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