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PowerPoint® Presentation
Chapter 3
Electrical Safety
Electrical Safety • Personal
Protective Equipment •
Lockout/Tagout • Lockout Devices •
Fire Safety • Confined Spaces •
Overhead Power Line Safety
Chapter 3 — Electrical Safety
Article 430 of the NEC®
covers requirements for
motors, motor circuits, and
controllers.
Chapter 3 — Electrical Safety
Safety labels are used
to indicate a situation
with different degrees
of likelihood of death or
injury to personnel.
Chapter 3 — Electrical Safety
Electrical shock is a condition
that results any time a body
becomes part of an electrical
circuit.
Chapter 3 — Electrical Safety
Grounding provides a direct
path for unwanted (fault)
current to the earth without
causing harm to individuals
or equipment.
Chapter 3 — Electrical Safety
A GFCI compares the amount of current in the
ungrounded (hot) conductor with the amount of
current in the neutral conductors.
Chapter 3 — Electrical Safety
When taking measurements
in an electrical circuit,
transient voltages can cause
electrical shock and/or
damage to equipment.
Chapter 3 — Electrical Safety
The applications in which
a DMM may be used are
classified by the IEC
1010 standard into four
overvoltage installation
categories.
Chapter 3 — Electrical Safety
Motor guards are used
for protection from
rotating parts of a motor
or anything connected to
the motor.
Chapter 3 — Electrical Safety
Personal protective
equipment is used to
reduce the possibility of
an injury.
Chapter 3 — Electrical Safety
Per NFPA 70E, the type of PPE required depends on
the voltage and where work is being performed.
Chapter 3 — Electrical Safety
The approach boundary is the distance at which PPE
is required while working on energized circuits to
prevent burns if an arc occurs.
Chapter 3 — Electrical Safety
Eye protection must be worn to
prevent eye or face injuries
caused by flying particles, contact
arcing, or radiant energy.
Chapter 3 — Electrical Safety
Hand protection includes
gloves worn to prevent
injuries to hands caused
by cuts or electrical
shock.
Chapter 3 — Electrical Safety
Knee pads are used to
provide protection and
comfort to technicians
who spend considerable
time on their knees.
Chapter 3 — Electrical Safety
Rubber insulating matting provides protection from
electrical shock when working on live electrical
circuits.
Chapter 3 — Electrical Safety
Equipment must be locked
out and/or tagged out before
installation, preventive
maintenance, or servicing is
performed.
Chapter 3 — Electrical Safety
Lockout devices are available in
various shapes and sizes that
allow for the lockout of standard
control devices.
Chapter 3 — Electrical Safety
Lockout/tagout kits comply
with OSHA lockout/tagout
standards.
Chapter 3 — Electrical Safety
An oily waste can seals out
oxygen to prevent
spontaneous combustion.
Chapter 3 — Electrical Safety
Fire extinguisher classes are based on
the combustibility of the material.
Chapter 3 — Electrical Safety
Article 500 of the NEC®
covers hazardous locations.
Chapter 3 — Electrical Safety
An energized electrical
work permit documents all
electrical work performed
on the premises.
Chapter 3 — Electrical Safety
Oxygen-deficient atmospheres
in confined spaces can cause
life-threatening conditions.
Chapter 3 — Electrical Safety
For maximum safety, procedures for
entering a confined space must follow
established OSHA standards.
Chapter 3 — Electrical Safety
Confined space entry
permit forms document
preparations, procedures,
and required equipment.