Quiz 2 Flashcards
Is there a difference between a shock and being electrocuted?
YES! being electrocuted means you die.
How does an electrical shock happen?
-Electricity flows in a circuit through a conductor.
-A person’s body can become part of the circuit.
-Shock occurs when the body completes the circuit.
What factors affect the Severity of a Shock?
-Amount of current (amps)
-Path of the current through the body
-Length of time
-Voltage
-Moisture
-Health status
What are the levels of shock and their probable effect
1 mA: slight tingling
5 mA: a disturbing slight shock felt
6-30 mA: Painful shock, loss of muscular control
50-150 mA: a potentially fatal shock that causes extreme pain, respiratory arrest, and severe muscular contractions
1000-4300 mA: Muscle and nerve damage, death is likely
10,000 mA: Cardiac arrest, severe burns and probable death.
What are some protective measures against shocks?
- Insulation (on wires)
- Guarding
- Grounding
- Protective Devices
- Safe Work Practices
What is the symbol for insulated tools?
a square with another square in it
How does guarding work?
2 ways to “Guard” Electrical Equipment
1. Location
2. Enclosure (fenced)
What is the electrical shock PPE ratings for gloves and helmets?
Gloves: 00, 0 ,1 ,2
Helmets: Class G (general 2,200 volts), Class E (electrical 20,000 volts)
What is an Emergency?
An event that has Death, Disruption, or Damage
What does a good emergency plan include?
Reporting, Evacuation, operation, contacts, accounting, and rescue
What are the rules for emergency exits?
- Emergency Exits and Exit Routes must be Clearly Marked.
- Emergency Exits and Exit Routes must be Unlocked during work hours.
- Confirm that the emergency exit doors have Panic Hardware or Lever Style (one hand - one motion door openers).
What is on the fire triangle?
Air, heat, and fuel
How does a fire extinguisher work?
by cooling the fuel, removing the oxygen, or interrupting the chemical reaction
How do you use a portable fire extinguisher?
Pull, Aim, Squeeze, Sweep (PASS)
What are the different types of fires and extinguishers?
A (solid materials), B (liquids or gas such as gasoline), C (Electrical fires), D (fires caused by reactive metals), K (kitchen fires)
How often should a fire extinguisher be checked?
annually by a fire equipment professional
What is a confined space?
You can enter and perform assigned work, AND limited or restricted entry or exit, AND not designed for continuous occupancy.
When does a confined space require a permit?
When it is a confined space that has a hazard!
What are some examples of confined space hazards?
Dangerous atmosphere, or
- Risk of engulfment
- Risk of entrapment
- Physical hazards
- Any other dangerous condition
What are some questions to ask when determining if a confined space needs a permit?
- Can a worker enter and perform work?
- Is there limited entry/exit?
- Is it designed for continuous occupancy?
- Is there a potential hazard?
What is the safe oxygen level?
19.5% - 23.5%
What happens at 19.5%, 17%, 14-16%, 6-10%, and <6% oxygen level?
19.5%: minimum safe level
17%: Increased heart rate, breathing rate
14-16%Poor coordination, rapid breathing, fatigue
6-10%: Nausea, vomiting, death in
8 minutes
<6%: Coma, convulsions and death
Who is on the team when someone enters a confined space?
Entrant, Attendant, and Entry Supervisor
What does the entrant need to know?
The hazards, How to use equipment, How to communicate, and How to exit
What does the attendant need to know?
▪ Know the hazards
▪ Know the signs and symptoms of exposure
▪ Maintain count of entrants
▪ Remain outside the space
▪ Communicate with entrants
▪ Monitor conditions
▪ Call for rescue
▪ Manage unauthorized persons
▪ Performs non-entry rescue
What does the entry supervisor need to know?
▪ Know the hazards
▪ Verifies safe entry conditions
▪ Verifies rescue services
Respirators provide protection from harmful?
▪ Dusts
▪ Metal Fumes – welding
▪ Solvent Vapors – spray coating, adhesives,
paint and cleaners
▪ Bacteria – TB in healthcare
▪ Chemicals – chlorine, anhydrous ammonia
▪ Gases and vapors
▪ Oxygen deficiency
What are the two categories of air contaminants?
Particulates (Settable and Suspended) and gaseous phase
What is the limit that particles are visible to the human eye?
50 µm
What are the classes of respirators?
Air-purifying respirators (APRs)
- Half Face APRs
- Full-Face APRs
- Powered ARPs (PARPs)
Atmosphere-supplying respirators
- Supplied-air respirators (SARs) – known as air-line units
- Self-Contained Breathing Apparatus (SCBA) units