Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Bill C45 does not affect engineers because engineers do not
direct other people to work.
Answer: FALSE
1
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
According to these slides, the goal of health and safety
management is to achieve a fatality rate as minimum as
possible.
Answer: FALSE
2
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
According to the SPIES Model presented in these slides,
“Emotional” is defined as when someone strongly feels about
the need.
Answer: TRUE
3
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The duration of current flow in human body is not an important
factor in determining the severity of electric shock.
Answer: FALSE
4
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
In general, a person can tolerate up to 30 mA of rms current at
60 Hz.
Answer: FALSE
5
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The “let-go current” at 2 kHz is lower than the let-go current at
60 Hz.
Answer: FALSE
6
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
According to the examples given in these slides, a four-coil
typical electric stove can draw current as much as 50 A.
Answer: TRUE
7
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The engineers ensure public safety through their designs.
Answer: TRUE
8
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The resistivity of the human body depends on skin conditions as
well as gender.
Answer: TRUE
9
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The muscle resistance in the human body is much higher than
the skin resistance.
Answer: FALSE
10
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The level of electric shock increases if the contact area between
the human body and a live (or hot) wire increases.
Answer: TRUE
11
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Dry skin has less resistance than wet skin.
Answer: FALSE
12
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
In a single phase electric wiring, either the neutral line or the
ground line is required.
Answer: FALSE
13
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
According to CSA Group’s electrical installation standards, the
colors of the live (hot) lines of a three-phase system should be
red, black and blue.
Answer: TRUE
14
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
If a person stands on an insulator and comes in contact with the
live (hot) line, she or he will never be electrocuted.
Answer: FALSE
15
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
In order to ensure safety, the switches should be connected on
the live (or hot) line.
Answer: TRUE
16
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Static electricity can be hazardous but it cannot cause a fire.
Answer: FALSE
17
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Bonding and grounding are the two methods of eliminating
static charge when pouring gasoline from one container to
another through a hose. In order to ensure safety, either the
bonding or the grounding technic is enough while pouring
gasoline.
Answer: FALSE
18
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Insulation failure is an important cause of arcing.
Answer: TRUE
19
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Arching results in fierce fire and the temperature of this fire can
reach a maximum value of 2000 C.
Answer: FALSE
20
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
Flash protection boundary is defined as the distance at which a
person can be exposed to 1.2 cal/cm2 of incident energy.
Answer: TRUE
21
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
A short circuit occurs when a live line (hot) and ground line
actually touch each other.
Answer: FALSE
22
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
GFCIs (Ground-Fault Circuit Interruption) activates when a
minimum of 5mA current difference occurs in the live (hot) and
neutral lines.
Answer: TRUE
23
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
A person can receive electrical shock due to step potential even
he or she is not in a direct contact with the live (hot) line.
Answer: TRUE
24
Introduction
Electric Shock
Arc and Blast
Other Safety Issues
Review
Is the following statement true or false?
The PPE rating (cal/cm2) of fire resistant cloths increases as the
minimum flash protection boundary value increases.
Answer: TRUE
25