There is 210.63, but it prohibits the required receptacle being connected to the LOAD side of the disconnecting means, this is from the 2008 NEC.
210.63 Heating, Air-Conditioning, and Refrigeration
Equipment Outlet. A 125-volt, single-phase, 15- or 20-
ampere-rated receptacle outlet shall be installed at an accessible
location for the servicing of heating, airconditioning,
and refrigeration equipment. The receptacle
shall be located on the same level and within 7.5 m (25 ft)
of the heating, air-conditioning, and refrigeration equipment.
The receptacle outlet shall not be connected to the
load side of the equipment disconnecting means.
Exception: A receptacle outlet shall not be required at oneand
two-family dwellings for the service of evaporative
coolers.
