Electrical Safety & Code Compliance Flashcards

Which NEC article specifically covers general requirements for electrical installations?

Answer: Article 110

NEC Article 110 covers general requirements for electrical installations, including examination, identification, and working space.

What is the minimum working clearance in front of a 480V panelboard in a typical commercial installation (Condition 1)?

Answer: 3 feet

NEC 110.26 requires a minimum of 3 feet of working clearance in front of equipment operating at 151–600V under Condition 1.

A ground fault circuit interrupter (GFCI) trips when current imbalance between hot and neutral exceeds:

Answer: 5 mA

GFCI devices are designed to trip at approximately 5 milliamps (4–6 mA range) of ground fault current to prevent electrocution.

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

Answer: Class C

Class C extinguishers use non-conductive agents (CO2, dry chemical) safe for use on energized electrical equipment fires.

Under OSHA 1910.333, when must electrical equipment be de-energized before work begins?

Answer: When live parts are exposed and work is within the limited approach boundary

OSHA 1910.333 requires de-energizing equipment when employees work on or near exposed live parts within approach boundaries.

What does the acronym 'LOTO' stand for in electrical safety procedures?

Answer: Lock Out / Tag Out

LOTO stands for Lockout/Tagout, the OSHA-required procedure to ensure equipment is de-energized and cannot be re-energized during maintenance.

According to NEC 210.8, GFCI protection is required for all 125V, 15A and 20A receptacles in which indoor commercial location?

Answer: Bathrooms

NEC 210.8(B) requires GFCI protection for receptacles in commercial bathrooms, among other specified locations.