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

OSHA 1926.416(a)(1) and OSHA 1926.600 require a minimum clearance of 10 feet from any part of a tool, equipment, or machinery to overhead power lines rated at 50 kV or less.

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

OSHA 1910.147 establishes LOTO as the procedure for controlling hazardous energy — electrical, mechanical, hydraulic, pneumatic, chemical, thermal — to protect workers during equipment servicing and maintenance.

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

GFCIs are designed to trip within 1/40th of a second (approximately 25 milliseconds) when they detect a ground fault of 5 milliamps or more, fast enough to prevent electrocution.

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

Under an AEGCP, cord sets, receptacles not part of a building's wiring, and equipment connected by cord and plug must be visually inspected for external defects before each day's use.

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

NFPA 70E and OSHA require rubber insulating gloves rated for the voltage level being worked on, worn with leather protectors to prevent mechanical damage, when working on energized electrical parts.

CHST - Construction Health and Safety Technician Practice Test

CHST - Construction Health and Safety Technician Practice Test

CHST Electrical Safety and LOTO 2