INTRODUCTIONS

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Module 2
ELECTROCUTIONS
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What You Will Learn

• Important facts about electricity
• Important terms relating to electricity
• OSHA regulations relating to working with
  electricity

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What You Will Learncontinued

• How to identify practices that protect you from
  electrical injuries
• How to find hazards at work that could cause
  electrocutions
• How to identify behaviors at work that could
  cause electrocutions

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Find the Electricity-Related Hazards
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Did You Know?

• About 700 workers get hurt by electricity every
  year.
• About 350 people die each year in electrical
  incidents.

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Did You Know?

• Construction has more electrocutions than any
  other industry.

• Electrical safety is important for all
  construction workers, not just electricians.

• When an electrocution occurs, there are often no
  emergency response plans.

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Did You Know?

• About 30 of electrical deaths involve cranes and
  power lines.
• Overhead power lines are not insulated. They
  carry tens of thousands of volts. They are
  dangerous to people working near them.

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Estimated Effects of AC Currents
(U.S. Standard 60 Hz)
PATH Harm is related to the path by which
current passes through the body.
1 milliamp (mA)-Barely perceptible
16 mA-Maximum current an average person can grasp
and let go
20-30 mA-Paralysis of respiratory muscles
100 mA-Ventricular fibrillation threshold
2 Amps-Cardiac standstill and internal organ
damage
15/20/30 Amps-Common U.S. household breakers
Chart and diagram courtesy of Associated General
Contractors of America
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Terms
Ground Fault
Insulation
Grounding
Ground Fault Circuit Interrupter (GFCI)
Lockout/Tagout
Circuit Breaker
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Quiz Question 1
TRUE OR FALSE?
It is acceptable not to comply with the
manufacturers instructions when installing
electrical equipment as long as a qualified
person does the work.
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Quiz Question 1
FALSE
OSHA 29 CFR 1926.403(b)(2)
Equipment must be installed and used in
accordance with instructions included in the
listing, labeling or certification.
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Quiz Question 2
TRUE OR FALSE?
Live parts of electrical equipment operating at
50 volts or more must be guarded.
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Quiz Question 2
TRUE
OSHA 29 CFR 1926.403(i)(2)(i)
Live parts of equipment operating at 50 volts or
more shall be guarded against accidental contact.
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Quiz Question 3
TRUE OR FALSE?
A temporary worksite has a 120-volt single phase
15-ampere receptacle outlet thats not a
permanent part of the building under
construction. Because it is temporary, it is not
necessary to use a ground-fault circuit
interrupter in that outlet.
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Quiz Question 3
FALSE
OSHA 29 CFR 1926.404(b)(1)(ii)
All 120-volt, single-phase 15- and 20-ampere
outlets on construction sites, which are not part
of the permanent wiring of the structure, shall
have approved ground-fault circuit interrupters.
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Quiz Question 4
TRUE OR FALSE?
If a switch is installed in a wet location, it
doesnt need a weather-proof enclosure as long as
people using the switch wear insulated gloves.
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Quiz Question 4
FALSE
OSHA 29 CFR 1926.405(e)(2)
All switches in wet locations must have
weatherproof enclosures.
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Quiz Question 5
TRUE OR FALSE?
It is acceptable to use a flexible cord as a
substitute for the fixed wiring of a structure.
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Quiz Question 5
FALSE
OSHA 29 CFR 1926.405(g)(1)(iii)(A)
Flexible cords and cables shall not be used as a
substitute for the fixed wiring of a structure.
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What are Your Best Practices?
When you use power tools
When you work with electricity
When you operate equipment around high electric
wires
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The Worksite Analysis
1. Identify your work space.
2. Look for hazards.
3. Use a checklist to identify hazards.
4. Discuss problems and corrections with
supervisor.
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Electricity-Related HazardsCase 1
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Electricity-Related HazardsCase 2
Photo courtesy of Associated General Contractors
of America
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Electricity-Related HazardsCase 3
Photo courtesy of Associated General Contractors
of America
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Electricity-Related HazardsCase 4
Photo courtesy of Associated General Contractors
of America
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Concerns at Your Worksite
Give examples of how a workers behavior could
create an electrocution hazard.