Coby:Andy Millar:
Hey, I've just had a brilliant idea, how about if we put some non-conductive material around live conductors, we could call it something like "insulation", as a primary protection, and then in case that fails put some sort of secondary protection in such as an RCD?
I'll wait for the Nobel prize to arrive in the post...In which case; when your 'primary protection' fails, you are therefore reliant on 'a residual current device being used as the sole means of protection against direct contact'...that doesn't work!
I think you'll find that primary and secondary 'protection' is provided by 'two layers' of insulation.
Only if you're using double insulation. Class I appliances may contain single insulated wires. And there's always "reinforced" insulation, to confuse matters.
And the pedants will argue that most electrical cable doesn't have two laters of insulation - it's "insulated and sheathed" - even though the sheath is made of the same stuff af the insulation.
Coby:Andy Millar:
Hey, I've just had a brilliant idea, how about if we put some non-conductive material around live conductors, we could call it something like "insulation", as a primary protection, and then in case that fails put some sort of secondary protection in such as an RCD?
I'll wait for the Nobel prize to arrive in the post...In which case; when your 'primary protection' fails, you are therefore reliant on 'a residual current device being used as the sole means of protection against direct contact'...that doesn't work!
I think you'll find that primary and secondary 'protection' is provided by 'two layers' of insulation.
Only if you're using double insulation. Class I appliances may contain single insulated wires. And there's always "reinforced" insulation, to confuse matters.
And the pedants will argue that most electrical cable doesn't have two laters of insulation - it's "insulated and sheathed" - even though the sheath is made of the same stuff af the insulation.
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