I have an outlet which I need to convert to GFi and also run an extra line from GFi for a light. Two seperate (12-2) lines input the current oultet which will be replaced by GFi. How should i wire so the light that will go from the GFi also be protected? Thx
The cable from the light should connect to the load side of GFCI. If you want the GFCI to protect the outlets downstream of that outlet, you need to find which set of 12-2 is line and which is load. Line connects to line, and load connects to load.
Well on the GFCI, it should be stated. Also, usually new ones will have a sticker covering the load terminals.
for determining the line/load on the wires that are there already, remove one black wire from the outlet and see if the outlet is still hot. If not,then the wire you removed is the line.
Of course you want to turn the breaker off and generally be safe while doing this. Cap the wire you take off so it doesn't accidentally brush you or a ground. And this is assuming your wiring was done correctly and black is wired hot. A non-contact voltage detector would work also if you can isolate the wires from each other enough to eliminate false indications.