Safety

Question 1

List the 7 general safety rules

Answer 1

1. Never work on an energized circuit if the power can be disconnected
2. Think
3. Avoid horseplay
4. Do not work alone
5. Work with one hand when possible
6. Learn first-aid
7. Avoid alcohol and drugs

Question 2

What are the 3 steps when making certain that the power has been turned off

Answer 2

1. Test the meter on a known live circuit to make sure the meter is operating
2. Turn off the power and test the circuit that is to become the de-energized circuit with the meter
3. Test the meter on the known live circuit again to make certain the meter is still operating

Question 3

A current of ________ usually causes a slight tingling sensation

Answer 3

2 to 3 milliamperes

Question 4

Currents between ________ cause muscular paralysis

Answer 4

30 and 40 milliamperes

Question 5

Between ________ causes breathing difficulty

Answer 5

40 and 60 milliamperes

Question 6

Currents between ________ generally cause death

Answer 6

100 and 200 milliamperes

Question 7

________ is a condition in which the heart begins to “quiver” and the pumping action stops

Answer 7

Fibrillation

Question 8

What is the mission of the Canadian Centre for Occupational Health and Safety (CCOHS)?

Answer 8

The CCOHS advocates for the complete physical, psychosocial, and metal well-being of working Canadians by providing training, information, and management systems. In short, to ensure safe and healthy workplaces in Canada

Question 9

________ outlines requirements for workplace electrical safety in Canada

Answer 9

CSA-Z462

Question 10

Information concerning hazardous materials is generally found on ________

Answer 10

Safety data sheets (SDS)

Question 11

List the 4 general safety rules for trenches

Answer 11

1. Do not walk close to trenches unless it is necessary. This can cause the dirt to loosen and increase the possibility of a cave-in
2. Do not jump over trenches if it is possible to walk around them
3. Place barricades around trenches
4. Use ladders to enter and exit trenches

Question 12

________ have a limited means of entrance and exit

Answer 12

Confined spaces

Question 13

List the 4 general rules for confined spaces

Answer 13

1. Have a person stationed outside the confined space to watch the person or persons working inside. The outside person should stay in voice and visual contact with the inside workers at all times. They should check air sample readings and monitor oxygen and explosive gas levels
2. The outside person should never enter the space, even in an emergency. but should contact the proper emergency personnel
3. Use only electric equipment and tools that are approved for the atmosphere found inside the confined space
4. A person working in a confined space should wear a harness with a lanyard that extends to the outside person

Question 14

________ procedures are generally employed to prevent someone from energizing a piece of equipment by mistake

Answer 14

Lockout and tagout

Question 15

When performing a lockout and tagout procedure, who is responsible for placing the lock on the equipment? Who should have possession of the key?

Answer 15

The person performing the work

Question 16

List the 6 articles of clothing maintenance and construction workers are usually required to wear

Answer 16

1. Head protection
2. Eye protection
3. Hearing protection
4. Fire-retardant clothing
5. Gloves
6. Safety harness

Question 17

List the 3 situations when a safety harness should be worn

Answer 17

1. When working more than 3 metres above the ground or floor or where a fall from a lesser height could result in a serious injury
2. When working near a hole or drop-off
3. When working on high scaffolding

Question 18

________ generally provide the safest elevated working platforms

Answer 18

Scaffolds

Question 19

Straight ladders should be placed against the side of a building or other structure at an angle of ________

Answer 19

76 degrees. The base of the ladder should be placed at a distance equal to one-fourth of the height

Question 20

The 3 things required for a fire to burn are ________

Answer 20

Fuel, heat, and oxygen

Question 21

________ involve common combustible materials such as wood or paper

Answer 21

Class A fires

Question 22

________ involve fuels such as a grease, combustible liquids, or gasses

Answer 22

Class B fires

Question 23

________ involve energized electrical equipment

Answer 23

Class C fires

Question 24

________ consist of burning metal

Answer 24

Class D fires

Question 25

________ are used to protect people from electric shock

Answer 25

Ground-fault circuit interruptors (GFCI)

Question 26

GFCIs are designed to detect a current difference of approximately ________

Answer 26

5 milliamperes (0.005A)

Question 27

What is a ground fault?

Answer 27

A ground fault occurs when an unintended path to ground is established

Question 28

Which 3 devices provide ground-fault protection?

Answer 28

Ground-fault circuit breaker, ground-fault receptacles, and GFCI extension cords

Question 29

________ are designed to protect people from electrical fires

Answer 29

Arc-fault circuit interrupters

Question 30

There are conditions where arcing in an electric circuit is normal. List 5 of these conditions

Answer 30

1. Turning a light switch on or off
2. Switching on or off of a motor relay
3. Plugging in an appliance that is already turned on
4. Changing a light bulb with the power turned on
5. Using motors that contain a commutator and brushes

Question 31

________ are caused by two conductors becoming shorted together

Answer 31

Parallel arc-faults

Question 32

________ are generally caused by loose connections

Answer 32

Series arc-faults

Question 33

________ covers the requirements for the grounding and bonding of electrical systems

Answer 33

CEC Section 10