Copyright Goodheart-Willcox Co., Inc.
67
Unit 10
Basic Wiring
Systems
In modern house wiring, the basic systems commonly used
involve sheathed nonmetallic cable, armored cable, and metal conduit.
Sheathed Nonmetallic Cable
Nonmetallic cable is often used on house wiring jobs where the
codes permit. It is easy to install, particularly where it is necessary to
“snake” the cable through the walls.
Installation of nonmetallic cable is shown in Figure 10-1. At the
cable ends, strip off the covering allowing at least 8 in. of insulated
wire for making connections. Fasten the connector to the outside of
the cable cover, and insert the cable through the knockout hole of the
box. The connector is designed to tightly grip the cable. Screw on the
locknut on the inside tightly.
Run the cable through holes drilled in center of joists or strap the
cable no farther apart than 4 1/2 ft. on supporting surfaces such as
studs, joists, walls, or the ceiling. Where the cable runs across joists
or through open spaces, support should be provided by running a
board (usually 1 × 4) to which the cable is strapped.
Connector
Sheathed
nonmetallic
cable
Strap
Grounding
wire
Figure 10-1. Installing nonmetallic cable.
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