I have a wall box with two devices that were installed new, 10 years ago: a single-pole light switch that controls a wall sconce - and a dual 120-V GFCI receptacle. Both devices are on the same 20-A, 120-V ckt. The light switch isn't wired through the GFCI. Recently, about a third of the time that I turn on the light switch, the GFCI trips, without anything plugged into the receptacles. Somehow, I figured that turning on the switch was inducing a spike seen by the GFCI. Both devices were Hubble. First, I replaced the light switch with a spare Leviton that I had on hand. No change - the GFCI still tended to trip when the switch was turned on. So then, leaving the Leviton switch in place, I replaced the Hubble GFCI with a new Leviton version. Problem solved! Somehow, after 10 years, the Hubble GFCI became touchy. Strange. Thoughts?

I'm in the process of remodeling a laundry room. This will cause me to extend the wiring for my washer/dryer power about 5 more feet. Is this a safe splice with wire nuts and tape? How far can I run from the breaker box safely? Thanks