Grounding of faucets on PVC piping
I've just bought an apartment and am renovating it. Just started on the electrical wiring and have a question.
At the main fuse box, I'm receiving 3 wires that enter the apartment - line (220AC), neutral and ground (presumably connected to the grounding installation of the entire building). There is a main GFCI breaker with the rating of 40/0.5A and a separate GFCI breaker for the bathroom with the rating of 25/0.03A. The apartment piping has been replaced and is now plastic. The bathtub i also plastic.
My question is - do I have to ground the metal faucets that connect on the end of plastic piping? Can these anyhow turn out "hot" since they are not connected to metal piping? For instance if a lightning strikes near the building (or onto the building itself) can a dangerous charge accumulate in the faucet and then discharge itself when I (or someone else) hold it?
The second question relates to the following hypothetical situation:
Let's say the plastic bathtub is filled with water, connected to the plastic piping and a person is inside it. The same person has a very bad habit of operating electrical equipment while taking a bath (stereo, hairdryer, etc...). What happens if a hairdryer falls in the water (remember the piping and the bathtub are plastic)? My bet is that the breaker will trip, but the GFCI will not since none of the current "escapes" to the ground (bathtub is basically isolated right?). Will the human inside the bathtub be in danger during this? If so how can one make the GFCI trip? My idea was to somehow ground the bathtub so at least some of the current would escape to the ground and that could only be done by grounding the metal ring at the drain at the bottom of the bathtub (the drainage piping that continues is also plastic). Would this work? Or do I worry too much and no harm can happen since the piping is plastic? :)