13-EHS Section 1 Flashcards
According to the Electrical Safety Hand Book, What is the primary purpose of the manual described in the passage?**
A. To provide guidelines for fire extinguisher usage
B. To educate and protect emergency responders dealing with electrical emergencies
C. To offer first aid instructions for various injuries
D. To outline traffic control procedures for emergency situations
B
This manual has been designed and developed
to educate and protect emergency responders
who are called upon to respond to emergencies
involving electrical systems.
According to the Electrical Safety Hand Book, According to the information provided, what is the average number of electrical contacts reported to the ESA from 2001 to 2010?**
A. 45
B. 209
C. 500
D. 1,000
B
The number of incidents reported to the ESA
involving overhead and underground power
lines, vaults and substaions from 2001 to 2010
averaged 209 electrical contacts per year
According to the Electrical Safety Hand Book, According to Ohm’s Law, how is voltage related to current and resistance?**
A. V = I + R
B. V = I - R
C. V = I × R
D. V = I ÷ R
C
These three factors are related
through Ohm’s Law which states: potential difference “E” (voltage) is equal to the current “I” multiplied by the resistance “R” (E=I x R or V =I x R). Key electrical terms frequently used
to describe electricity are “voltage”, “current”,
“resistance” and “grounding”.
According to the Electrical Safety Hand Book, What is the role of a conductor in electricity?**
A. To resist the flow of electricity
B. To generate electricity
C. To conduct electricity readily
D. To store electricity
C
Materials classified as “conductors” are of low resistance and conduct electricity readily and in large amounts. Some examples; porcelain, glass and plastic are insulators, all metals (iron, copper, lead, aluminum, silver and gold) are conductors.
Humans, largely made of water and dissolved minerals, are good conductors.
According to the Electrical Safety Hand Book, At what voltage range do most electrical fires originate, according to the information provided?**
A. 120/240 volts or less
B. 300 to 750 volts
C. 69,000 to 500,000 volts
D. 2,300 to 20,000 volts
A and B (below 750 Volts)
Most electrical fires originate in equipment operating below 750 volts. In the electrical industry, this is referred to as low or secondary voltage.
According to the Electrical Safety Hand Book, What is “step potential” as described in the passage?**
A. The potential difference between two conductors
B. The potential difference across a circuit
C. The difference in voltage causing electricity to flow through the body
D. The potential gradient on the ground surface
C
The potential gradient, or voltage difference, creates two problems known as “step potential” and “touch potential”
According to the Electrical Safety Hand Book, what is the primary hazard created when electrical equipment becomes faulty?**
A. Lightning strikes
B. Explosive electrical flashes
C. Water damage
D. Faulty grounding systems
D
However; if equipment is damaged, electricity can be released at a point that is not protected by these safety systems. For example when a “live”
wire lies on the ground, the electricity will fan out from all points of contact with the ground.
According to the Electrical Safety Hand Book, What is the main consequence of arcing in electrical equipment?**
A. Overloading of conductors
B. Release of combustible materials
C. Explosive electrical flashes
D. Formation of semi-conductors
C
Any victim of electrical arc flash should be assessed for the following effects on the body:
1. Burns to skin from the ultraviolet radiation of the lash.
2. Burns to the eyes and skin from molten metal splatter.
3. Burns to the skin from clothing including under layers of clothing that were ignited by the arc lash.
According to the Electrical Safety Hand Book, In the context of electrical hazards, what does “touch potential” refer to?**
A. The potential difference between two conductors
B. The potential difference across a circuit
C. The difference in voltage causing electricity to flow through the body
D. The potential gradient on the ground surface
C
The potential gradient, or voltage difference, creates two problems known as “step potential” and “touch potential”.
According to the Electrical Safety Hand Book, What does the Safe Limits of Approach aim to establish in emergency situations involving electrical hazards?**
A. Maximum distance from the emergency scene
B. Minimum distance from live power lines
C. Optimal communication with utility personnel
D. Appropriate time to initiate emergency response
B
All persons, tools, and equipment including aerial devices and extension ladders must maintain the minimum distance. This is called maintaining the Safe Limits of Approach.
According to the Electrical Safety Hand Book, Why is knowledge of potential gradients important for emergency responders, especially in wet conditions?**
A. To estimate the depth of water in flooded areas
B. To determine the presence of chemical contaminants
C. To assess the uneven distribution of electrical flow on the ground
D. To predict the likelihood of lightning strikes
C
In wet conditions, the low of electricity across the ground can be significantly greater. This effect is known as “potential gradient”. It is also referred to as “ground gradient”
According to the Electrical Safety Hand Book, What precautionary measure does the manual recommend when using an aerial device near live power lines?**
A. Requesting additional personnel for assistance
B. Ensuring the operator is on the ground
C. Maintaining the Safe Limits of Approach
D. Operating the aerial device at full capacity
A or C
When using an aerial device near these Safe Limits of Approach, you must have a competent worker, designated as a signaler (see 7.3), observe the proximity to the power line and to signal to the operator
According to the Electrical Safety Hand Book, What role does a signaller play when using an aerial device near power lines?**
A. Operating the aerial device
B. Observing the proximity to power lines and signaling to the operator
C. Ensuring the Safe Limits of Approach are violated
D. Providing first aid to victims
B
When using an aerial device near these Safe Limits of Approach, you must have a competent worker, designated as a signaller (see 7.3),
observe the proximity to the power line and to signal to the operator
According to the Electrical Safety Hand Book, According to Table 1, what is the minimum distance required for a voltage of 200,000 volts under the Safe Limits of Approach?**
A. 3.0 meters
B. 4.5 meters
C. 6.0 meters
D. 10.0 meters
B
Table 1. Safe Limits of Approach
Voltage of Live Line
Power (Volts)
Minimum Distance
Metres
750 to 150,000- 3.0 (10 t)
150,001 to 250,000- 4.5 (15 t)
250,001 and higher-
6.0 (20 t
According to the Electrical Safety Hand Book, How does the handbook suggest emergency responders deal with faulty electrical equipment?**
A. By ignoring it and waiting for utility personnel
B. By attempting to fix it themselves
C. By maintaining safe limits of approach
D. By requesting an inspection from electrical utilities
E. C and D
E
