7/6/2023 0 Comments Romex wireNon-Metallic Sheathed Wires : Non-metallic sheath wire, or Romex, is used in most homes and has 2-3 conductors, each with plastic insulation, and a bare ground wire.Just like main power feeder wires, the cables should be rated for 25% more than the actual load. These are used to power the main junction box and the circuit breaker panels. Panel Feed Wires : Panel feed cables are generally black insulated THHN wire.They’re made with stranded or solid THHN wire and the cable installed is 25% more than the load required. Main Feeder Wires : Main power feeder wires are the wires that connect the service weather head to the house.The neutral is usually of a smaller gauge and grounded at both the electric meter and the transformer. They are composed of two insulated aluminum wires wrapped with a third bare wire which is used as a common neutral. Triplex Wires : Triplex wires are usually used in single-phase service drop conductors, between the power pole and weather heads.X – Synthetic polymer that is flame-resistant. ![]() N – Nylon coating, resistant to damage by oil or gas.HH – High heat resistance (up to 194☏).These letters depict the following NEC requirements. The letters THHN, THWN, THW and XHHN represent the main insulation types of individual wires. For example, a low-voltage lamp cord with 10 Amps will require 18-gauge wire, while service panels or subpanels with 100 Amps will require 2-gauge wire. Common wire sizes are 10, 12 and 14 – a higher number means a smaller wire size, and affects the amount of power it can carry. Sizing of wire is done by the American wire gauge system. Size of WiresĮach application requires a certain wire size for installation, and the right size for a specific application is determined by the wire gauge. Here’s some detailed information on the various features of electrical wire, which will help you choose the correct composition: 1. The information printed on the electrical wire covering is all that you need to choose the correct wire for your home. Some factors that will affect your choice of electrical wiring include color, label information and applications.
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