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when will you be able to purchase copys of the 18th edition?

wouldnt a visual/insulation resistance test let you know the condition of the wireing.

here we are,started on my journey to be an electrician at 45 after helping sparkys drilling holes and pulling cable over many years thought id get qualified so far completed eal level 2 and 17th edition....currently studying level 3 c&g hope to of completed in june.