Modern homes typically have non-metallic cable, consisting of two or more individual wires wrapped in the plastic sheathing. Separate lines are generally comprised of hot, neutral, and ground wire. Wires can also be installed inside flexible plastic tubing or rigid metal tubing. In the case of exposed wiring, this type of cable is commonly known as a conduit. Read on to learn more about residential wiring systems.
According to electrical inspections Philadelphia pa, choosing an NM cable wire type for residential wiring systems is recommended.This cable type is lightweight and relatively cheap compared to metal conduit and armored cables. It is also less prone to rips and snags than wires encased in the metallic sheathing. However, this type of wire cannot be used outdoors or above drop ceilings, so a conduit must be used.