NETA Switchgear and Busway Inspection 2

Question 1

According to NETA standards, what is the maximum allowable temperature rise for bolted bus connections measured via infrared thermography under load?

Accepted Answer

30°C above ambient

Answer

NETA allows up to 30°C temperature rise above ambient for bolted bus connections before action is required.

Question 2

During a switchgear inspection, you notice the arc chutes on a draw-out circuit breaker are cracked. What is the correct course of action?

Accepted Answer

Replace the arc chutes before returning to service

Answer

Cracked arc chutes cannot safely interrupt fault currents and must be replaced before the breaker is returned to service.

Question 3

What does the NETA MTS specify regarding the frequency of medium-voltage switchgear maintenance intervals for normal service conditions?

Accepted Answer

Every 3 years

Answer

NETA MTS recommends medium-voltage switchgear maintenance every 3 years under normal service conditions.

Question 4

When performing a dielectric withstand test on switchgear, the test voltage is applied for how long according to NETA standards?

Accepted Answer

60 seconds

Answer

NETA specifies a 60-second duration for dielectric withstand (hi-pot) tests on switchgear insulation.

Question 5

Which busway condition most directly indicates that joint resistance has increased due to connection degradation?

Accepted Answer

Elevated hot spot temperature at a joint compared to adjacent sections

Answer

A hot spot at a joint that is elevated compared to adjacent bus sections is the classic indicator of increased contact resistance from connection degradation.

(NETA) InterNational Electrical Testing Association Certified Technicians Practice Test

(NETA) InterNational Electrical Testing Association Certified Technicians Practice Test

NETA Switchgear and Busway Inspection 2