Concealed wiring is wiring that can not be seen. A good example of this is house wiring that is located behind the wall board. The word concealed gets mentioned in the electrical code. It states, that any concealed wiring cannot be covered until the electrical inspector or one of his representatives checks to make sure that the installation is safe to cover.
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Cleat wiring is exposed while in conduit wiring the wires are well protected inside tubes/pipes.
domestic electrical wiring designig
Conduit wiring system is preferred for workshop lighting.
Older house wiring didn't always use a ground wire. It's acceptable to continue to use the older wiring, but if you update your wiring, anything that you improve must meet current wiring standards. You can replace a faulty light switch without updating the rest of the wiring, but if you bring the house up to modern standards it will improve the safety standards. If you can afford to upgrade your house wiring, the payoff will be worth it.
An electrical conduit is a system for routing and protecting electrical wiring. A cable conduit can be found wherever electrical wiring is needed. This includes wiring in appliances or in the walls of a home.