EETC Electrical Safety & Code Compliance 2

Question 1

Which NEC article specifically covers general requirements for electrical installations?

Accepted Answer

Article 110

Answer

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

Question 2

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

Accepted Answer

3 feet

Answer

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

Question 3

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

Accepted Answer

5 mA

Answer

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

Question 4

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

Accepted Answer

Class C

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

(EETC) Electrical Technician Certification Practice Test