Maximum Earth fault loop impedance 

As a qualified electrician with over 45 years experience I would agree and say this is probably the best explaination I have come across... certainly worthy of a C & G module - well done that man !

Thank you, I use illustrator for all my videos

Thanks very much ghostcatcher7530, I'm a few of that total😀

Thank you

Thanks Martin

Thanks Rusko_Customs, appreciate you watching, and commenting.

Thanks very much boldstarfish

Thank you pin for your continued support

Thanks AR_T

Thank you Pedro