I'm wondering what causes this: I have noticed that when certain appliances kick on, like my washing machine, refrigerator, and window A/C (120V), it will cause the lights to dim on other circuits. My house was built in `48; it was upgraded to a 100 amp breaker box quite some time ago (I'm guessing at least 15-20 years). It is actually a duplex--I'm describing the side I live in. Some of you may remember that I rewired the other side a few months ago; I haven't rewired my side yet. Each side has its own 100 amp box, the power comes in from the pole on one line and feeds both meters. My 100 amp box has five 120 circuits (three 20 amp & two 15 amp), and one 240 (30 amp) for the dryer. They ran 12-2 Romex from the five 120 breakers to the old fuse box, which they turned into a junction box and connected the Romex to the old BX cable that runs throughout the house. I'm wondering if this is anything I should be concerned about. I will eventually be rewiring everything like I did next door. Over there, I replaced the 5 old breakers with 10 new ones, eliminated all the old BX and ran new 12-2 Romex throughout the house with new switches, receptacles, and fixtures everywhere, following all the advice from here as to code and had it inspected before and after by an electrician (quite a job for a DIY'er, but it's all done thanks to all of your help!)

My G F C I was tripping on my hot tub I replaced it as instructed and it still trips, It only trips when I push the blower switch into the off position if I leave the air blower switch on and reset GFCI every thing works fine until I shut off the air blower then it trips?:madhell: I did replace the air blower switch and it didnt help resolve this