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Low Earth Orbit
Lighting & Electrical
Correct feeder cable for distro
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<blockquote data-quote="Brian jojade" data-source="post: 145902" data-attributes="member: 211"><p>Re: Correct feeder cable for distro</p><p></p><p>The L21-30 is a 3 phase conductor. Your unit uses 6 20 amp circuits total. On the back of the unit, breaker 5 and breaker 6 use 2 dual outlets.</p><p></p><p>The L21-30 is 30 amps per leg, of which, each leg has 2 circuits with 20 amp breaker on each. There is no main breaker on the unit, so you MUST have an appropriate breaker upstream to prevent overload. You could pull 40 amps per leg without blowing a breaker on your distro. </p><p></p><p>For feeder cable, you could get by with 10/4 cable, but I'd suggest getting 8/4 instead. The cost is nearly the same, and if you have to make long runs, the voltage drop will be less. depending on the length of run you need, you might be best off making a few different lengths of cables so you can use the shortest possible length. Remember if you make one long cable, you CANNOT leave the unused portion coiled in the case, as that creates a fire hazard.</p><p></p><p>At the tie in, you will need a breaker box that has a triple 30 breaker. Here you can attach cam tails and then tie in as needed. Per code, if you are tying into a system with larger power rating than your distro of 30 amps, your 30 amp breaker has to be within 10 feet of your tie in.</p></blockquote><p></p>
[QUOTE="Brian jojade, post: 145902, member: 211"] Re: Correct feeder cable for distro The L21-30 is a 3 phase conductor. Your unit uses 6 20 amp circuits total. On the back of the unit, breaker 5 and breaker 6 use 2 dual outlets. The L21-30 is 30 amps per leg, of which, each leg has 2 circuits with 20 amp breaker on each. There is no main breaker on the unit, so you MUST have an appropriate breaker upstream to prevent overload. You could pull 40 amps per leg without blowing a breaker on your distro. For feeder cable, you could get by with 10/4 cable, but I'd suggest getting 8/4 instead. The cost is nearly the same, and if you have to make long runs, the voltage drop will be less. depending on the length of run you need, you might be best off making a few different lengths of cables so you can use the shortest possible length. Remember if you make one long cable, you CANNOT leave the unused portion coiled in the case, as that creates a fire hazard. At the tie in, you will need a breaker box that has a triple 30 breaker. Here you can attach cam tails and then tie in as needed. Per code, if you are tying into a system with larger power rating than your distro of 30 amps, your 30 amp breaker has to be within 10 feet of your tie in. [/QUOTE]
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Correct feeder cable for distro
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