I was going to install a gfci outlet and had the copper wiring to pigtail to the aluminum since I knew our house was built in 72 and had aluminum. When I opened the box I found an exisitng pigtail with wiring going into the receptacle that was copper colored with no mention of aluminum on the wire. I hooked the gfci up to it and it works fine. My question is is this a copper pigtail evidently put in by the previous owners and how to I differentiate between the two. I always had heard aluminum was silver. Thanks for any input.
18 years ago