NEC Quiz: Article 225 Answers

by Mark Lamendola

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  1. [225.6] 10 AWG copper or 8 AWG aluminum, if 600V or less for spans up to 50 ft (longer spans are allowed if supported by messenger wire). For over 600V, it's 6 AWG copper or 4 AWG aluminum.
     

  2. [225.14(C). 4 inches.
     

  3. [225.30]. One. But, there are exceptions for 6 special conditions and for some other situations as noted in A, B, C, D, and E..
     

  4. [225.33]. No, the rules are the same because the underlying physics are the same. You have a maximum of 6 disconnects allowed.
     

  5. [225.40]. You must install branch circuit overcurrent devices on the load side, in a readily accessible location. These must be of lower ampere rating than the feeder overcurrent device.