Title: INTRODUCTIONS
1Module 2
ELECTROCUTIONS
2What You Will Learn
- Important facts about electricity
- Important terms relating to electricity
- OSHA regulations relating to working with
electricity
3 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
4Find the Electricity-Related Hazards
5Did You Know?
- About 700 workers get hurt by electricity every
year. - About 350 people die each year in electrical
incidents.
6Did 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.
7Did 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.
8Estimated 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
9Terms
Ground Fault
Insulation
Grounding
Ground Fault Circuit Interrupter (GFCI)
Lockout/Tagout
Circuit Breaker
10Quiz 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.
11Quiz 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.
12Quiz Question 2
TRUE OR FALSE?
Live parts of electrical equipment operating at
50 volts or more must be guarded.
13Quiz 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.
14Quiz 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.
15Quiz 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.
16Quiz 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.
17Quiz Question 4
FALSE
OSHA 29 CFR 1926.405(e)(2)
All switches in wet locations must have
weatherproof enclosures.
18Quiz Question 5
TRUE OR FALSE?
It is acceptable to use a flexible cord as a
substitute for the fixed wiring of a structure.
19Quiz 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.
20What are Your Best Practices?
When you use power tools
When you work with electricity
When you operate equipment around high electric
wires
21The 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.
22Electricity-Related HazardsCase 1
23Electricity-Related HazardsCase 2
Photo courtesy of Associated General Contractors
of America
24Electricity-Related HazardsCase 3
Photo courtesy of Associated General Contractors
of America
25Electricity-Related HazardsCase 4
Photo courtesy of Associated General Contractors
of America
26Concerns at Your Worksite
Give examples of how a workers behavior could
create an electrocution hazard.