ensure smooth switch components local authorities ieee iec specific instructions qualified personnel proper functioning load 5 testing operating handle mechanical linkage failures 4 installing operating mechanism forces exerted nameplate ratings undamaged check general overview requires expertise complex process switch terminals goab switch installation location correct operation install interlocks prevent overheating secure connections manufacturers instructions solid foundation switch contacts switch contacts interlocks godo switch installation switch foundation prepare manufacturers installation manual prevent accidental operation switch assembly assemble insulation connections connect relevant safety standards contact resistance measurements typically involves mounting lockouttagout procedures grounding follow safety guidelines highvoltage electrical systems