I would like to add a GFCI electrical outlet in a toilet/tub room. I can tie into a dedicated 20 amp switch circuit for the light/vent/heater in the toilet/tub room. I am concerned about having enough room in the single gang box for the light/vent/heater switch to add the additional pigtail and GFCI supply.
Conversely I can tie in to a 15 amp circuit for the adjoining bedroom outlets and light switches, however I’ve read that a bathroom GFCI should be on a 20 amp circuit.
Any perspective would be appreciated.
Dave
Best Answer
I'm sorry Dave, I'm afraid I can't do that
What you can do is to add a new 20A circuit (of course) or if there are other receptacles in the bathroom, you can connect to those.
Update based on comments:
It appears that the goal is not to add a "GFCI electrical outlet" per se, which would typically be understood to mean a duplex receptacle for plugging in various devices, but rather the goal is apparently to add another hardwired light fixture. That is a different matter entirely.
An additional low-power lighting fixture, such as an LED fixture designed for use as a night light, can certainly be tied in to the same power source used for the primary heat/light/fan. That solves the "GFCI problem" - no GFCI needed for hardwired lighting. That solves the "connecting to a non-bathroom circuit problem" - that (a) is for receptacles and (b) you wouldn't actually be connecting to a non-bathroom circuit.
There may still be issues with box fill, so expanding the box in some way, or adding another box nearby, may be necessary to make all this work. But you can do it on the existing circuit.
FYI, "you can't put a GFCI on a 15-amp circuit in a bathroom" is not actually true. What is true is that a new bathroom is required to have a 20-amp circuit dedicated to the bathroom (or possibly bathrooms), and that circuit must have GFCI protection for the receptacles. However, if you have an older bathroom with 15-amp circuits (as I do), retrofitting GFCI makes sense for safety - as my electrician did many years ago, I don't think he really asked, I think he just said "you need this" (when he was in my house doing other things I asked for) and he was right.