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Just to put you in the picture, I am recently qualified, I know that I should understand all this stuff by now, but there are still a few things I dont quite get! Different earthing systems... I understand how the earths are generated for each system but its more the technical stuff, and why the rules are there..
I know that main bonds on a TT system can be 6mm, and that this is because the fault current on a TT system is very unlikely to be large. Here are a couple of other questions I have:
Why is it for a TNS system the max size main bond you need to install is 35mm depending on tail size, yet PME you could need 70mm bonds??
Why is PME not allowed on garage forecourts?
Any other info you can give me will be much appreciated..
I know that main bonds on a TT system can be 6mm, and that this is because the fault current on a TT system is very unlikely to be large. Here are a couple of other questions I have:
Why is it for a TNS system the max size main bond you need to install is 35mm depending on tail size, yet PME you could need 70mm bonds??
Why is PME not allowed on garage forecourts?
Any other info you can give me will be much appreciated..