ASP Electrical Safety 2

Question 1

Which of the following best describes the 'arc flash boundary' according to NFPA 70E?

Accepted Answer

The distance at which the incident energy equals 1.2 cal/cm², the onset of a second-degree burn

Answer

The arc flash boundary is the distance from an arc source at which the incident energy decreases to 1.2 cal/cm², the threshold for a curable second-degree burn.

Question 2

Under NFPA 70E, an Energized Electrical Work Permit is required when:

Accepted Answer

Work must be performed on or near exposed energized electrical conductors and the equipment cannot be de-energized

Answer

An Energized Electrical Work Permit is required whenever work must be done on energized conductors that cannot feasibly be de-energized, documenting the justification and controls.

Question 3

Electrical equipment located in a Class I, Division 1 hazardous location contains:

Accepted Answer

Flammable gases or vapors present in ignitable concentrations under normal operating conditions

Answer

Class I, Division 1 locations are those where flammable gases or vapors exist in ignitable or explosive concentrations under normal operating conditions.

Question 4

The primary cause of electrical fires in the workplace is:

Accepted Answer

Overloaded circuits, damaged wiring, or loose connections generating heat

Answer

Overloaded circuits, deteriorated wiring insulation, and loose connections are the leading causes of electrical fires because they create heat that can ignite nearby combustibles.

Question 5

What does the 'hierarchy of controls' recommend as the most effective means of protecting workers from electrical hazards?

Accepted Answer

Elimination of the hazard by de-energizing equipment before work begins

Answer

Elimination (de-energizing the equipment) is the most effective control because it removes the hazard entirely rather than just mitigating exposure to it.

(ASP) Associate Safety Professional Practice Test

(ASP) Associate Safety Professional Practice Test

ASP Electrical Safety 2