The Complete Guide to Wiring: DIY Home Electrical Installations & Repairs with Step-by-Step Guide by Isaac Martin

Author:Isaac Martin [Martin, Isaac]
Language: eng
Format: azw3, epub
Published: 2020-05-31T16:00:00+00:00

Understanding How Electrical Wiring Is Labeled

Insulation on electrical wires is stamped with various codes and numbering that indicates the wire type and performance characteristics of the insulation. Similarly, nonmetallic (NM) cable, which contains multiple wires, has markings on the outer sheathing of the cable. Understanding the basic markings helps you choose the right type of wire or cable for your project.

Labels On Individual Wires

Individually insulated wires typically are used for installation inside of conduit or flexible metal cable. The coding system relates to the performance characteristics of the wire insulation. The most common types of wire used in residential construction are THHN and THWN. Here's what the letter mean:

T : Thermoplastic, a heat-resistant plastic used on many types of wire

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