On Thu, 29 Oct 2009 18:17:21 -0400, Ian Hill - K8MM wrote:
>Houses are typically feed off of a center tapped secondary. 240V
>measured between phase conductors and 120V between either phase
>conductor and the center tap. There isn't any sort of dangerous short
>by having the neutral ( i.e. center tap) and the ground bonded together
>in the primary distribution panel in a house....its supposed to be
>connected that way.
Exactly right. One other VERY important point -- it is both ILLEGAL and
UNSAFE to connect neutral to ground at any other point. The proper
connection of a 240V load is to the two ends of the transformer only,
and with the ground wire connected for safety.
There is some equipment that needs both 240V and 120V to operate. That
equipment gets its 240V from the two ends of the transformer, and MUST
get 120V between one side of the transformer and NEUTRAL, NOT GROUND.
73,
Jim Brown K9YC
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