OP
P-Courty
Are you an electrician?
Trev and I and most people here qualified through an apprenticeship where we were taught all of this.
And I too went through an apprenticeship and done my 17th edition 3 years ago and unfortunatly fell into a situation of not being able to get work so have been a labourer for 3 years and need to get back up to scratch on what i was qualified to do which is why i thought i would ask friendly electricins with more experience for a bit of help and guidance to get me back in the right position to get myself up to scratch