In a dwelling a 15/20a 120v circuit that is GFCI protected can be 12"
If you want to avail yourself of the 725 class 2 rules than make it 6"
the other poster is correct 30v, current limited supply.
BTW you can also get confused when people talk about "low voltage"
with the utility since that is 600v or less to them. Medium voltage is
up to 4500 or so and over that is high voltage.
NEC 490.2 (Equipment over 600V) defines high voltage as over 600V.
NEC 551.2 (Recreation park) low voltage as 24V or less.
For many, low voltage is 600V or less, medium voltage is up to 40kV(maybe
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