Hi guys, can any one tell me what to do when a coc has to be done on a coc has110V a.c and d.c system, it's a couple of plc's that he had to be installed but i told my boss that the coc doesn't cover control circuits - he didn't like that. But this made me wonder, where would you do a coc for a low voltage system? What works from a 50V - 120V system except lights which is covered by sans 10142 cause plc's aren't or can it be covered up until the point of control the plc's can switched off?