Voltage Between Adjacent Devices

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finhead

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On Page 157 of Mike Holt's "Changes to the NEC 2008" is a picture of a 277V circuit feeding a switch and a 120V circuit feeding a receptacle in the same device box. According to the illustration, the voltage between the ungrounded 277V conductor and the ungrounded 120V conductor is 380V.
Does anyone know how this value is derived?

Thanks,
Brian Dolan
 

roger

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See Don's post #17 HERE, there is also an image from Smart$ in post #19 that will help.

Roger
 
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