Wiring Systems
4
71
Objectives
Information in this chapter will enable you to:
Know where to fi nd codes and authorities
for an installation.
Recognize the marks of the most popular
testing agencies.
List the different conductor systems used in
residential and light commercial wiring.
Explain the basics of conduit bending.
Become familiar with the many different
types of raceway systems.
Electrical Codes and
Safety Agencies
There are many different methods of
providing electricity to the occupants of a
modern residence. You will learn about the
various types of conductors, devices, and proce-
dures available to use and those that cannot be
used. Before selecting any of these systems, you
should be aware of the agencies and codes that
ensure the materials and procedures you use
are safe and reliable.
Technical Terms
Anti-short bushing
Armor
Armored cable (AC)
Authority having
jurisdiction (AHJ)
Back-to-back bend
Bonding strip
Box offset
BX
Cable
Conduit
Electrical metallic
tubing (EMT)
Electrical nonmetallic
tubing (ENT)
Field bend
Flexible metal
conduit (FMC)
Greenfi eld
Intermediate metal
conduit (IMC)
Liquidtight fl exible
metal conduit (LFMC)
Nonmetallic sheathed
cable (NM)
National Electrical
Code® (NEC)
Nationally recognized
testing laboratory
(NRTL)
Offset bend
Occupational Safety
and Health
Administration
(OSHA)
Raceways
Rigid metal
conduit (RMC)
Rigid polyvinyl
chloride conduit (PVC)
Romex
Saddle bend
Service-entrance
cable (SE)
Shrink
Stub bend
Underground feeder
and branch-circuit
cable (UF)
Underground
service-entrance
cable (USE)
Wiring
Wiring system
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