NAME THAT HAZARD
Contact with exposed energized conductors can produce this electrical hazard.
Accept: What is a shock hazard?
The chance that an electrical incident will occur is described by this term.
What is likelihood?
A person may begin to experience a tingling sensation within this range of current.
What is 0.5 to 3 milliamps?
Accept: What is 0.5–3 mA?
According to the lesson, this incident-energy level is the threshold for an incurable burn.
What is 1.2 calories per square centimeter?
Accept: What is 1.2 cal/cm²?
The amount of time required for an overcurrent protective device to interrupt a fault.
What is clearing time?
This hazard releases intense thermal energy when current travels through ionized air.
What is an arc flash?
The seriousness of the injury or damage that could result from an electrical incident.
What is severity?
This range represents the approximate “let-go” threshold.
Correct response: What is 10 to 40 milliamps?
Accept What is 10-40 mA?
Increasing the distance between the worker and the arc generally has this effect on the energy reaching the worker.
What is decreasing the incident energy?
Accept: What is reducing the exposure?
A protective device that interrupts a fault more quickly generally has this effect on incident energy.
What is reducing incident energy?
Accept also: What is decreasing the severity of the exposure?
An electrical explosion can create a pressure wave, flying debris, and extremely loud sound.
What is an arc blast?
Increasing the distance between a worker and an electrical hazard primarily reduces this part of risk.
What is severity?
At the let-go threshold, this physical reaction may prevent someone from releasing an energized object.
What is involuntary muscle contraction?
Accept: What is muscle contraction?
A worker located closer to an arc source will generally receive this amount of incident energy compared with a worker farther away.
What is more incident energy?
Accept: What is greater incident energy?
Proper maintenance helps protective devices operate as intended and primarily reduces this component of risk.
What is severity?
Accept "both" if the team can explain how proper maintenance could also reduce the likelihood of equipment failure.
This must be established to eliminate electrical hazards before work begins.
What is an electrically safe work condition?
Accept: What is de-energizing and establishing an electrically safe work condition?
Keeping equipment doors closed and properly secured primarily reduces this part of risk by making exposure less likely.
What is likelihood?
Current passing through this area of the body can affect both the heart and lungs.
What is the chest?
Accept: What is the upper body?
Increasing the amount of time an arc is allowed to continue has this effect on incident energy.
What is increasing the incident energy?
This boundary is based on the distance at which incident energy reaches 1.2 cal/cm².
What is the arc-flash boundary?
Shock, arc flash, and arc blast are all examples of this broader category.
What are electrical hazards?
Establishing an electrically safe work condition affects electrical risk in this way.
What is reducing both likelihood and severity?
Accept: What is eliminating the electrical hazard?
These three factors help determine the severity of an electric shock.
What are the amount of current, the path through the body, and the duration of contact?
Accept: Current magnitude, current path, and exposure time.
These three factors addressed in the lesson influence the amount of arc energy reaching a worker.
What are current, distance, and clearing time?
Accept: Available current, working distance, and duration.
A control that prevents contact with energized parts while also reducing potential exposure to arc energy affects risk in this way.
What is reducing both likelihood and severity?