CHST Electrical Safety and LOTO 2

Question 1

Under OSHA 1926.416, what minimum clearance must be maintained from overhead energized power lines rated at 50 kV or below when using equipment on a construction site?

Accepted Answer

10 feet

Answer

6 feet

Answer

15 feet

Answer

20 feet

Question 2

What is the primary purpose of Lockout/Tagout (LOTO) procedures under OSHA 29 CFR 1910.147?

Accepted Answer

To control hazardous energy and prevent the unexpected energization or release of stored energy during servicing and maintenance

Answer

To document equipment maintenance history

Answer

To alert workers of equipment that is out of service for repairs

Answer

To establish a chain of custody for equipment keys

Question 3

Ground Fault Circuit Interrupters (GFCIs) are required by OSHA on construction sites. How quickly does a GFCI interrupt a circuit when a fault is detected?

Accepted Answer

Within 1/40th of a second (approximately 25 milliseconds)

Answer

Within 1 second

Answer

Within 5 seconds

Answer

Within 100 milliseconds

Question 4

Under OSHA 1926.404, an Assured Equipment Grounding Conductor Program (AEGCP) is an alternative to GFCIs. How often must cord sets and equipment be visually inspected under an AEGCP?

Accepted Answer

Before each day's use

Answer

Weekly

Answer

Monthly

Answer

Each shift change

Question 5

What PPE is required when working on energized electrical systems with exposed live parts above 50 volts?

Accepted Answer

Rubber insulating gloves rated for the voltage level, worn with leather protectors

Answer

Standard leather work gloves and safety glasses

Answer

Insulated boots only

Answer

Dielectric hard hat and safety glasses only

Question 6

Which electrical hazard involves a sudden release of energy from an unintended arc path that can produce temperatures up to 35,000°F and cause severe burns?

Accepted Answer

Arc flash

Answer

Ground fault

Answer

Overload

Answer

Transient overvoltage