My home was built in 1986. It does not appear that any of the outlets or switches are grounded. I'm sure this is not correct and I just don't know what to look for. I will use one outlet and one switch as an example. The wiring is labeled as 14 AWG THHN. The outlet has one blue wire coming in and one going out(hot wire). It also has one white wire coming in and going out (neutral). The switch has one blue wire in/out and a red load wire going to a switched outlet. Now, unless I'm mistaking there is no grounding here. BTW, what is the difference between THHN and ROMEX wiring if any?

The GFCI breaker on my hot tub begins to regularly trip after about a month or 2 of replacing it, until finally it can be reset any longer. Once I put in a new breaker, it is fine again, and does not trip for 2 more months, then it begins again. Any sugestions, replacing these $100 breakers is getting crazy. Is it possible that there is a loose connection somewhere? I extended the run about a year ago by about 5 feet since I moved the hot tub, and added to the wiring inside junction boxes using the same wire with wire nuts. Thanks -