Electrical Safety Mod 1-4 Flashcards
What are the 2 main forms of Electrical Hazards?
Arc flash
Electric shock
Which CSA standard is used for electrical safety in the workplace?
CSA z462
What is the safest risk control method for electrical hazards?
The energize if and when possible
What is the pyramid of risk control methods from safest to least safe?
Elimination
Substitution
Engineering controls
Administrative controls
PPE
An arc flash can be caused by many things including:
Dust or conductive dust in electrical equipment
Dropping tools inside of electrical equipment
Accidental contact with electrical equipment
Material failure
Corrosion
Faulty installation
What is an arc flash boundary?
The distance from an Arkansas at which a person may be exposed to incident energy. Incident energy can cause onset of second-degree burn on unprotected skin.
What identifies as a qualified person?
A person who has the skills and knowledge related to the construction and operation of electrical equipment and installations. They have received sufficient training to recognize and avoid the hazards involved.
What is an arc duration?
The total time it takes the system over current protective devices to detect and interrupt a current fault.
What is incident energy?
The amount of thermal incident energy to which a worker’s face and chest could be exposed at the working distance during an arc flash incident.
It is measured in joules per centimeter squared or calories per centimeter squared
What current level in milliamps would you be experiencing a painful shock and the inability to let go?
15 to 20
What are three factors that determine the severity of an arc flash injury?
Working distance, amount of arcing that occurs, time it takes for upstream electrical protective device to open.
What are the three main purposes of an arc flash risk assessment?
Identifying the arc flash
Likely heard of occurrence
Additional protection required?
What are some effects that workers may experience when exposed to an arc flash?
Flying objects
Heat up to 20,000°c or more
Sound blast of over 168 DB
Toxic vapors
Immense light
What are the five steps for emergency action?
- Safely remove the victim from the source of shock
- Prevent further injury
- Send for qualified help
- Eliminate the danger
- Report the accident
How much current causes ventricular fibrillation of the heart?
100 to 200 mA
What term is used to describe the long-term symptoms of electrical shock?
Sequelae
When working or operating machinery near overhead power lines the safe clearance distance of____meters must be maintained until the voltage of the power line is verified.
7
What are the basic PPE required?
Arc rated clothing
Hard hat
Eye and face protection
Work boots
Work gloves
What does the acronym atpv stand for?
Ark thermal protective valve
Which rubber insulating glove class is rated for the highest voltage?
Class rating number four, color orange, rated for 36 kilovolts
What part of Alberta OHS code covers lockout tagout requirements?
Part 15
What are the six basic steps for locking out and re-energizing equipment?
- Warn personnel
- Use proper shutdown procedures
- Disconnect equipment
- Padlock
- Confirm de-energized
- Re-energized after work is complete
What does the occupational health and safety act establish?
The oh&s Act establishes a framework of rules for employers worker suppliers and government agencies that enforce safety standards.
What does the OHS regulation provide?
Further clarification and information to sections of the ACT
What does the OHS code provide?
Comprehensive detailed information for employers workers suppliers and government agencies
What is the definition of an employer?
A person who is self-employed in an occupation, person who employs one or more workers, person designated by an employer as the employer’s representative, or director or officer of a corporation who oversees the occupational health and safety of the workers employed by that corporation
What are employee responsibilities according to OHS regulations?
Report any hazardous or potentially hazardous situations to your supervisor
Report all injuries immediately
Where all required PPE and ensure that it is in good condition
Inspect all equipment tools and machinery before use
Participate in regularly scheduled work site safety planning meetings
Ensure you know and follow emergency procedures
Do not perform any work you feel is unsafe
True or false
The workers compensation board is a government-funded profit-based corporation.
False
What are the three elements of fire off and presented in the workplace?
Oxygen, fuel, heat
Employers must report accidents to the WCB within how many hours of the incident?
72
Worksite specific training must cover for areas:
Hazard information, the different modes of product identification used at the workplace, procedures for safe use storage and handling of controlled products, procedures for dealing with fugitive emissions and emergencies
What are employee responsibilities?
Participating in training, using information obtained to protect yourself, applying workspace labels and when required, demonstrating the application of safe work procedures with controlled products and the knowledge of why those procedures are required
True or false
The WCB is provincially legislated and guided by the Alberta workers compensation act
True
Is the Alberta construction safety association non-profit based?
Yes
Is the construction owners association of Alberta comprised of members who work in heavy industrial construction and industrial maintenance?
Yes
Workplace hazards fall into four main categories:
Biological
Chemical
Ergonomic
Physical
What are some hazard assessment tools?
Hazard assessment reports
Checklists
Health and safety plans
Emergency response plans
First aid records in incident reports
According to occupational health and safety what control provides the highest level of worker protection?
Elimination
How long are employers expected to retain first aid and incident reports?
3 years
The type of first aid equipment required is based on:
How hazard is the work is
The time taken to travel from the work site to a healthcare facility
The number of workers on each shift
What are the first aid requirements for low hazard work at a close work site with 5 to 9 workers at the work site per shift?
One emergency first aider one standard first aider and a number two first aid kit
Oh&s classifies a work site as isolated if it is located more than how many minutes from a healthcare facility?
40 minutes
With an exposure level of 115 or more decibels what is the permitted duration of work?
Never
With an exposure level of 82 decibels what is the duration of permitted work?
16 hours
What is an example of air supplying respirators?
Airline respirators hoods helmets and suits as well as self-contained breathing apparatus
At what decibel level does hearing protection become mandatory?
115 DB
What is a characteristic of protective footwear with a yellow triangle on the outer side or tongue of the right shoe?
Soul puncture protection and grade 2 protective toe to withstand an impact up to 90 joules
Which class of industrial safety head were provides the best protection from electrical shock in the addition to impact and penetration resistance?
Class E
what ladder material is best for working around electrical equipment.
fibreglass
how many meters above do guardrails become mandatory?
3.0m or higher
What is a node point on a scaffold?
The intersection of a standard and transom
What ratio are outriggers used
3:1
What is the biggest rule when lifting heavy objects?
Do not bend your back and reach down
what does SWL stand for?
safe work load
what are wire rope slings made of?
carbon steel or stainless steel
what are load softeners used for?
used as padding on a wood block to prevent / limit the kinking of a sling
formula for calculating SWL
SWL= D^2 x 8
D= diameter in inches
SWL= Tons
safety factor 5:1
why do slings have a red core?
to indicate wear and damage
What is WLL?
Working Load Limit
what do you do if there are signs of damage on a rope sling?
tag it or destroy it before someone can use it?
with a 1000lb weight is it optimal, safe, or dangerous to have the weight with two, 90 degree angles
optimal
with a 1000lb weight is it optimal, safe, or dangerous to have the weight with two, 60- 45 degree angles
safe
with a 1000lb weight is it optimal, safe, or dangerous to have the weight with two, 30 degree angles
dangerous
what part of a hook is the loads weight placed on?
rings and links
hooks that do not have a safety latch must be:
moused
what is a bridle hitch?
connecting 2,3,or 4 hitches for hoisting
