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

5°C above ambient

Answer

10°C above ambient

Answer

15°C above ambient

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

Clean and return to service

Answer

Reduce the breaker's trip setting

Answer

Apply insulating varnish to the cracks

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

Every 6 months

Answer

Every 1 year

Answer

Every 6 years

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

10 seconds

Answer

5 minutes

Answer

15 minutes

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

Discoloration of the busway housing

Answer

Moisture condensation on the exterior enclosure

Answer

Vibration noise during operation

Question 6

What is the purpose of the phase barrier insulation installed between phases inside metal-clad switchgear?

Accepted Answer

To prevent phase-to-phase faults during maintenance and operation

Answer

To reduce eddy current losses

Answer

To improve heat dissipation from the bus bars

Answer

To reduce audible noise from magnetic forces

Question 7

When inspecting a low-voltage switchgear bus, a technician finds the silver plating on a bus bar joint has worn through to bare copper. What is the recommended action?

Accepted Answer

Apply NO-OX-ID compound and re-torque to specification

Answer

Replace the bus bar section with properly plated material

Answer

Polish the bare copper and re-torque

Answer

Apply electrical tape over the exposed area