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Mike Hartigan

In article ,
says...
mm wrote:

How can he have too much amperage available? If the wires two the 120
volt circuit are as big as the wires to the original circuit, and the
receptacle is big enough to handle whatever is plugged in, how can
there be too much amperage?

I'm assuming that the OP wants to hook up a standard 15A duplex
receptacle. If the original circuit is more than 20A then generally you
cannot wire a 15A receptacle to it.

....unless you replace the 20A breaker with a 15A.