Quick two-part question. The wife and I recently bought a gas range to replace our electric. Aside from having to extend the existing gas line, I also need to install a 120v outlet in the wall behind the stove; only a 220v outlet there now. Thought the simplest way to do this would be to fish a wire down from the microwave outlet above. Once I pulled the cover off and outlet out of the box, I see there is a 3-wire and 4-wire coming into it. It took me a little while to figure out that the supply is the 4-wire with the red and black wires on separate 20A breakers. The red looks like the dedicated circuit for the microwave and the black wire feeds a GFCI and a chain of 5 normal outlets along the counter below.
My first question, is there any problem with tapping into the circuit (black wire) feeding the GFCI outlets when all circuits share the same 12awg neutral wire?
And the second, I’ve read that the piezo-igniters on the stove can trip GFCIs. I’m assuming this is mainly a problem when the stove is downstream from the GFCI, but would it be a problem if the stove was 4-5’ upstream from the GFCI?
For what it’s worth, I don’t expect the range’s current draw to be significant since it only runs the electronics, igniters, oven lights and convection fan. Please correct me if I am wrong here?