N nur farhanah Distinguished Jan 27, 2012 1 0 18,510 Jan 27, 2012 #1 give two reasons why extra cable is needed in the wiring process ?
tigsounds Splendid May 29, 2010 3,922 1 23,460 Feb 11, 2012 #2 #1: Redundancy against damage/defects. #2: Future system expansion.