EETC Electrical Safety & Code Compliance 4

Question 1

In a 3-phase 4-wire wye system, what voltage exists between any two hot conductors?

Accepted Answer

208V

Answer

In a 208Y/120V wye system, line-to-line voltage is 120V × √3 ≈ 208V between any two phase conductors.

Question 2

Which NEC article governs the installation of branch circuits?

Accepted Answer

Article 210

Answer

NEC Article 210 covers branch circuits, including ratings, required outlets, and GFCI/AFCI requirements.

Question 3

An AFCI breaker is designed primarily to protect against which type of hazard?

Accepted Answer

Arcing faults that can ignite fires

Answer

Arc Fault Circuit Interrupters detect the unique electrical signature of dangerous arcing faults that can ignite fires without tripping standard breakers.

Question 4

What is the maximum voltage drop allowed on a branch circuit per NEC recommended practice (informational note)?

Accepted Answer

3%

Answer

NEC 210.19(A) informational note recommends limiting branch circuit voltage drop to 3% for best performance.

Question 5

A worker must use rubber insulating gloves rated for 1,000V. According to ASTM standards, what class are these gloves?

Accepted Answer

Class 0

Answer

ASTM Class 0 rubber insulating gloves are rated for maximum use voltage of 1,000V AC (1,500V DC).

(EETC) Electrical Technician Certification Practice Test

(EETC) Electrical Technician Certification Practice Test

EETC Electrical Safety & Code Compliance 4