re: Number of outlets on 220V 30A breaker.

Technically, you can have branch circuits (multiple outlets) but you can't have multiple devices plugged in that exceed 80% of the rated current capacity.

quote:

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NEC 210.23(B):

210.23 Permissible Loads, Multiple-Outlet Branch Circuits. In no case shall the load exceed the branch-circuit ampere rating. A branch circuit supplying two or more outlets or receptacles shall supply only the loads specified according to its size as specified in 210.23(A) through (D) and as summarized in 210.24 and Table 210.24.

...

(B) 30-Ampere Branch Circuits. A 30-ampere branch circuit shall be permitted to supply fixed lighting units with heavy-duty lampholders in other than a dwelling unit(s) or utilization equipment in any occupancy. A rating of any one cord-and-plug-connected utilization equipment shall not exceed 80 percent of the branch-circuit ampere rating.

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If you want them plugged in all the time and want to meet code you need multiple circuits.