redeye1234
Member
Hi Everyone,
I am a student and am new here and I have a question that is not a plc topic. I would like to know how to go about sizing fuses on the primary side of a transformer. The transformer is 10KVA. the primary voltage is 480V three phase and the secondary is 200V three phase. I fused the secondary based on the load. The primary already has a 30 amp breaker. My task is to put a disconnect switch with j fuses before the breaker. My question is would the fuses be of the same value as the breaker? My answer came out to 30.05 amps. My calculation is as follows - 10000/(480*1.732). I was told to calculate my fuses based on the secondary load. I am not sure about this and would like a second opinion. Thanks.
I am a student and am new here and I have a question that is not a plc topic. I would like to know how to go about sizing fuses on the primary side of a transformer. The transformer is 10KVA. the primary voltage is 480V three phase and the secondary is 200V three phase. I fused the secondary based on the load. The primary already has a 30 amp breaker. My task is to put a disconnect switch with j fuses before the breaker. My question is would the fuses be of the same value as the breaker? My answer came out to 30.05 amps. My calculation is as follows - 10000/(480*1.732). I was told to calculate my fuses based on the secondary load. I am not sure about this and would like a second opinion. Thanks.