load calculation

Old 06-18-04, 10:53 AM
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load calculation

Let me see if I have this right. I am planning on running a 6/3 feed on a 60 amp breaker to a detached 300sq.ft. bldg. sort of an office. I have a subpanel with 6 breakers 4 20amp and 2 15amp. That's 110amps or 55amps@240 volts. So far so good. The distance panel to panel is about 150 ft. not good for 6/3 wire but one of the 20 amp circuits is for a 3amp undercounter refrig, one for a 13 amp microwave, one for a 13 amp sewage pump, and one for a bathroom with 2 lights a fan and a plug. one of the 15's is for 6 60 watt lights and the other for 7 plugs. Am I correct in thinking that my actual load is only about 26 amps @ 240 volts. I do not need to consider extra capacity as there is zero likelyhood of expanding any of these circuits. 6/3 should be entirely adequate then especially considering that the duty cycle of the big draws (sewage pump, microwave) is very low. What do you think? Jeff
Old 06-18-04, 11:57 AM
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150 feet is not excessive for a 240-volt feeder. Even if you hadn't said that there is zero chance of expanding, I would have told you that the 6/3 is okay. You don't have a concern in the world.

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