Electricians Guide Fifth Edition By John Whitfield ~upd~ →

Buy it. Read it. Tab it. And then pass it down to the next apprentice who walks onto your site. Some tools wear out; great knowledge only sharpens with use.

He cut out the damaged section, installed a new junction box, pulled fresh Romex, and spliced it properly with wire nuts. He taped the box, secured the staple, and Electricians Guide Fifth Edition By John Whitfield

You need both . The BS 7671 is the law; Whitfield is the translator. Use Whitfield to learn the concept; use the IET book to verify the regulation number. Buy it