I think I'd look for the appropriate UL standard for the product. We do a
lot of UL508 stuff. Some of our stuff runs on external class 2 power
supplies, so isolation and safety is dealt with there. Other stuff runs on
a standard 120VAC 60Hz outlet. On one of our products, we have a 15A
inlet. All internal wiring is rated for 15A, so no main fuse or circuit
breaker is required. We do have circuit breakers for each of our outputs
to protect the triacs (this is a theatrical dimmer). We also have a PTC
thermistor to protect the power transformer from overcurrent. On single
phase loads (120VAC), you only need to switch and fuse the hot side, not
the neutral, since a short to ground on the neutral does not create a fire
hazard. Wire colors are generally black for hot, white for neutral, and
green for safety ground. I believe international colors can also be used
(brown for hot, blue for neutral, green/yello for safety ground).

Harold


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