The mechanical code allows the receptacle to be on a different level than the equipment. The mechanical code would allow a receptacle to be on the supply side of a disconnect.
The electrical code requires that the receptacle be on the same level as the equipment. The electrical code puts the receptacle on a different circuit than the circuit that supplies the equipment.
CEC 89.101.7 Order of Precedence and Use
89.101.7.1 Differences
In the event of any differences between these building standards and the standard reference documents, the text of these building standards shall govern.
89.101.7.2 Specific Provisions
Where a specific provision varies from a general provision, the specific provision shall apply.
89.101.7.3 Conflicts
When the requirements of this code conflict with the requirements of any other part of the California Building Standards Code, Title 24, the most restrictive requirements shall prevail.
CMC 102.0 Applicability
102.1 Conflicts Between Codes
Where the requirements within the jurisdiction of this mechanical code conflict with the requirements of the plumbing code, the plumbing code shall prevail. In instances where this code, applicable standards, or the manufacturer's installation instructions conflict, the more stringent provisions shall prevail. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall prevail. [OSHPD 1, 1R, 2, 3, 4 & 5] See Chapter 1, Division I, Section 1.1.7