Safety Protocols & Hazard Prevention Flashcards

What is the minimum approach distance for an unqualified worker near energized 15 kV overhead conductors?

Answer: 10 feet

OSHA requires unqualified workers to maintain at least 10 feet from energized lines up to 50 kV.

Which PPE category under NFPA 70E requires arc-rated clothing with a minimum arc rating of 40 cal/cm²?

Answer: Category 4

NFPA 70E PPE Category 4 requires arc-rated clothing with a minimum arc rating of 40 cal/cm².

A ground fault circuit interrupter (GFCI) trips when leakage current exceeds which threshold?

Answer: 5 mA

GFCI devices are designed to trip at 4–6 mA (nominally 5 mA) to protect against electrocution.

When using a portable generator on a job site, which safety measure is MOST critical to prevent carbon monoxide poisoning?

Answer: Operating it at least 20 feet from building openings

Generators must be kept at least 20 feet from doors, windows, and vents to prevent CO buildup inside structures.

Under OSHA's lockout/tagout standard, which step must occur BEFORE applying the lockout device?

Answer: De-energize the equipment

Equipment must be de-energized before applying lockout devices; verification of zero energy state follows after.

Which class of fire extinguisher is appropriate for energized electrical equipment fires?

Answer: Class C

Class C extinguishers use non-conductive agents suitable for energized electrical equipment fires.

According to OSHA 1926.502, safety nets must be installed when workers are exposed to falls of more than how many feet and guardrails or personal fall arrest systems are not feasible?

Answer: 6 feet

OSHA's construction standard requires fall protection — including safety nets — for falls greater than 6 feet.