Car charging questions and earthing.

[Johnconnor]

Hi all, I'm a trainee and just have a question.

If the earthing for the Car charging is changed to TT and there is a light fitting close on PME, can you get a shock from two different earth potentials (light fitting and car)? Or does there need to be a fault?
And does that mean you can get a shock from any earth potentials i.e a bonded water pipe and an unbounded gas pipe.
Thanks

 

[buzzlightyear]

https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3Dq87H7aIujjA&ved=2ahUKEwjpj5XcieDtAhUzpHEKHZ4aAhAQwqsBMAN6BAgBECE&usg=AOvVaw2rKGBAYhjmJcuixQKpi3Tp