MAKE A MEME View Large Image Circuit designing.jpg current by dividing power to voltage If you have 3-phase device also divide it to 3 Third calculate full wiring resistance to find out cable parameters Transfomer has resistance approximately 0 25 0 3Ω Cable length ...
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Keywords: Circuit designing.jpg current by dividing power to voltage If you have 3-phase device also divide it to 3 Third calculate full wiring resistance to find out cable parameters Transfomer has resistance approximately 0 25 0 3Ω Cable length between distribution substation and building is usually 1 kilometer Four calculate short circuit current to find out suitable circuit breaker to avoid overheating or fire Last step divide short circuit current from step 4 to circuit breaker's charactristic to 5 if circuit breaker has B characteristic B is put to protect devices without coils to 10 if circuit breaker has C characteristic C is put to protect devices with coil cause their high current during start try to not put D -type cause any small malfunction of your device will put to switch off main circuit breaker additionaly to protectable group's breaker and leave all building without electricity till you turn on main circuit breaker Remember Circuit breaker's maximum current should be less than cable's short circuit current to avoid fire and some more than your devices current to avoid false deenergizing own Dmitry G 2010-07-22 Cable lining Mains electricity Electrical power distribution schemas Electrical schemas
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