Of course he can use it to feed a subpanel. What he *can't* do is use it to
feed a subpanel that supplies both 120V and 240V loads.
Consider: if the subpanel supplies only 240V loads, there's no need for a
neutral, and 10/2 WG is fine. Also, if the subpanel supplies only 120V loads,
there's no need for two hots, but of course only every other breaker stab in
the panel will have power.
Doug Miller (alphageek at milmac dot com)
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