Bob,
this is a start.......

(2) Total Cord-and-Plug-Connected Load. Where connected to a branch circuit supplying two or more receptacles or outlets, a receptacle shall not supply a total cord-and-plug-connected load in excess of the maximum specified in Table 210.21(B)(2).

Table 210.21(B)(2) Maximum Cord-and-Plug-Connected Load to Receptacle

1)----Circuit Rating (Amperes)
2)----Receptacle Rating (Amperes
3)----Maximum Load (Amperes)

1)------------2)--------3)
15 or 20----- 15------ 12
20------------20------ 16
30------------30-------24
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[This message has been edited by sparky (edited 01-31-2002).]