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Common Wire

https://forums.diydoctor.org.uk/viewtopic.php?f=182&t=8328

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Common Wire

Posted: Sat Jan 26, 2008 7:53 pm
by Vinniemac
Why is the common wire called "common" ?

Posted: Sat Jan 26, 2008 10:49 pm
by ericmark
On a change over switch you connect either L1 or L2 to common. So common always connects to something. With on off switches the wire connected to hinge would be called common as switches use same moulding.
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