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why common trip breakers for 120V circuits?

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Wayne Whitney Wayne Whitney is offline

Wayne Whitney is offline

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why common trip breakers for 120V circuits?

On 2008-02-04, wrote:

What is leading me to investigate these is I see that at some point
previously the central A/C installers tied the a/c power onto these
breakers by sticking their wires under the terminals with the
existing ones (big no-no).

This is usually true, but some breakers are designed and listed for
two wires. For example, Square D QO breakers have a metal plate with
two channels, one on each side.

Wayne

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