toller wrote:

You say it is a 30a outlet.
30a 240v or 120v?
3wire or 4wire?

I am going to "guess" it is a 30a 240v with 3wire. If so, then what you
want to do is impossible. A subpanel requires 4wire.

All you could do (and I doubt it would be legal with the old breaker box)
would be to change the circuit to 120v, run it to the box and take 2 or 3
120v circuits out of it.

If it is infact 4wire, then sure it can be done; but you probably don't want
to do it yourself.


Is the garage attached or detached?
How many wires are run to the receptacle?
--
Tom H