If the outlet is on an outside wall there is a plastic boot that goesaround the outlet. The purpose of this boot is to keep the vapour barrier intact. The edges of this boot are then taped to the wall vapour barrier to make a complete air seal. The insulation goes behind the outlet boot which allows the wall R value to remain the same as the rest of the wall.
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Because it has electricity flowing to the outlet.
A 15 amp 125 volt outlet is a household outlet.
Electrical wall outlet having two plug receptacles.
switch socket outlet
In North America an ordinary electrical receptacle is rated at 15 amps.