ASP Electrical Safety 3

Question 1

According to OSHA, which of the following is NOT an acceptable method to protect employees from electrical shock when working near overhead power lines?

Accepted Answer

Relying solely on verbal warnings from a spotter without any physical barriers

Answer

De-energizing and visibly grounding the lines

Answer

Maintaining the minimum approach distance of 10 feet for lines up to 50 kV

Answer

Erecting insulating barriers between the worker and the lines

Question 2

The 'touch potential' in electrical safety refers to:

Accepted Answer

The voltage between an energized object being touched and the ground beneath the worker's feet

Answer

The voltage required to activate a GFCI

Answer

The maximum safe voltage level for extension cords

Answer

The potential difference across an arc flash boundary

Question 3

When applying NFPA 70E's incident energy analysis method, the two critical inputs needed to determine incident energy are:

Accepted Answer

Available fault current and arcing duration (clearing time of overcurrent protective device)

Answer

Voltage level and wire gauge of the conductors

Answer

Worker age and years of electrical experience

Answer

Panel location and distance from the main service entrance

Question 4

Under OSHA 29 CFR 1910.303, electrical equipment must be installed and maintained in a manner that:

Accepted Answer

Examines and uses equipment listed or labeled by a nationally recognized testing laboratory (NRTL)

Answer

Is approved only by the facility's in-house electrical engineer

Answer

Follows manufacturer specifications regardless of OSHA requirements

Answer

Uses only copper wiring rated at 600 volts or less

Question 5

A safety professional discovers that workers are using extension cords as permanent wiring. This practice is hazardous primarily because:

Accepted Answer

Extension cords lack the overcurrent protection and physical protection required of permanent wiring

Answer

Extension cords are more expensive than permanent wiring

Answer

Extension cords produce more electromagnetic interference

Answer

OSHA requires extension cords be replaced every six months

Question 6

The resistance of the human body used in standard electrical safety calculations is typically assumed to be:

Accepted Answer

500 to 1,000 ohms for skin-to-skin contact under typical conditions

Answer

10,000 ohms regardless of conditions

Answer

50 ohms representing worst-case wet conditions

Answer

100,000 ohms representing dry laboratory conditions

Question 7

Which of the following best describes the purpose of equipment grounding in electrical systems?

Accepted Answer

To provide a low-resistance fault current path that causes overcurrent devices to trip and clear the fault

Answer

To prevent static electricity buildup on metal surfaces

Answer

To equalize voltage across parallel circuit branches

Answer

To reduce the impedance of the neutral conductor