A system of components including posts, top rail, mid-rail and toe board.
What is a guardrail system?
100
The amount of electrical energy required to stop a person's heartbeat.
What is 1/10 of an amp (100 milliamps)?
100
This is the normal concentration of oxygen in air.
What is 21%?
Normal air also contains 78% nitrogen.
200
The required height range for the top rail of a guardrail system, according to OSHA.
What is 39 to 45 inches (42 inches plus or minus three)?
200
A device that protects wires from overheating and thereby prevents fires but does not protect against electric shock.
What is a circuit breaker?
200
This is the concentration at which an atmosphere is considered by OSHA to be oxygen deficient, that is, it lacks sufficient oxygen to sustain human life.
What is 18.5%?
300
It consists of a harness, lanyard and anchor point and is abbreviated "PFA".
What is a personal fall arrest system?
300
These wires are covered with an insulation that is meant to protect them from corrosion in the weather but not insulation with enough integrity to allow safe touching of the wires.
What are overhead (high voltage) wires?
300
When it's missing, this either is consumed (by respiration and or by combustion) or is displaced by something heavier than air.
What is oxygen?
400
The weight/force needed to be withstood for an anchor point for a personal fall arrest system.
What is 5,000 pounds per person?
400
This device protects personnel from electric shock and is required by OSHA for all cord and plug connected electrical power tools used in construction activity.
What is a GFCI --- Ground Fault Circuit Interrupter?
400
This smells like rotten eggs, is toxic in low concentrations and is a normal by-product of decay of biological (animal and plant) materials.
What is hydrogen sulfide?
500
A) The height at which OSHA requires fall protection for construction activities?
B) The maximum length for a fixed length lanyard?
A) What is 6 feet?
B) What is 6 feet?
500
These may not be hung or suspended using metal fasteners such as staples, bent nails, tie-wire and so on.
What are electrical cords and stringlights?
500
These four gases are commonly found in the atmosphere, in addition to oxygen and nitrogen, in environments where biological (plant and animal) materials are decaying.
What are carbon dioxide, carbon monoxide, hydrogen sulfide and methane?