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Question on wiring diagram for 3500/3000w generator

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http://forum.allaboutcircuits.com – Hope someone can answer a basic question for me on the attached wiring diagram from a 5 or 6 y/o Nikota 3500/3000w generator. The genset runs well, producing 240v at the NEMA L14-30 receptacle and 120v at the duplex receptacle. A 4P2T toggle switch selects the voltage between 240 and 120. The wiring to the L14-30 receptacle seems straight forward, with the brown feed from the first phase (call it Phase 1) providing 120v on one terminal, and the blue wire from the other phase (Phase 2) feeding 120v to the opposite terminal. Since the feeds are 180 degrees out of phase, 240v is the resu (Embedded)