Hi jb,
If one were to wire a 15A duplex recepticle with two 15A circuits that were on the same phase, one would be exceeding the ampere rating of the device.
Not to mention #1, 5, 7 and 8 below.
NEC 2002 110.3 Examination, Identification, Installation, and Use of Equipment.
(A) Examination. In judging equipment, considerations such as the following shall be evaluated:
(1)Suitability for installation and use in conformity with the provisions of this Code
FPN:Suitability of equipment use may be identified by a description marked on or provided with a product to identify the suitability of the product for a specific purpose, environment, or application. Suitability of equipment may be evidenced by listing or labeling.
(2)Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided
(3)Wire-bending and connection space
(4)Electrical insulation
(5)Heating effects under normal conditions of use and also under abnormal conditions likely to arise in service
(6)Arcing effects
(7)Classification by type, size, voltage, current capacity, and specific use
(8)Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment.
Hope this helps.
Dave
