Switchgear and Busway Inspection Flashcards
7 cards from real NETA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Switchgear and Busway Inspection flashcards as text
According to NETA standards, what is the maximum allowable temperature rise for bolted bus connections measured via infrared thermography under load?
Answer: 30°C above ambient
NETA allows up to 30°C temperature rise above ambient for bolted bus connections before action is required.
During a switchgear inspection, you notice the arc chutes on a draw-out circuit breaker are cracked. What is the correct course of action?
Answer: Replace the arc chutes before returning to service
Cracked arc chutes cannot safely interrupt fault currents and must be replaced before the breaker is returned to service.
What does the NETA MTS specify regarding the frequency of medium-voltage switchgear maintenance intervals for normal service conditions?
Answer: Every 3 years
NETA MTS recommends medium-voltage switchgear maintenance every 3 years under normal service conditions.
When performing a dielectric withstand test on switchgear, the test voltage is applied for how long according to NETA standards?
Answer: 60 seconds
NETA specifies a 60-second duration for dielectric withstand (hi-pot) tests on switchgear insulation.
Which busway condition most directly indicates that joint resistance has increased due to connection degradation?
Answer: Elevated hot spot temperature at a joint compared to adjacent sections
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.
What is the purpose of the phase barrier insulation installed between phases inside metal-clad switchgear?
Answer: To prevent phase-to-phase faults during maintenance and operation
Phase barriers provide isolation between energized phases, preventing accidental phase-to-phase contact faults during operation and maintenance.
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?
Answer: Apply NO-OX-ID compound and re-torque to specification
Applying an appropriate anti-oxidant compound and re-torquing to specification is the recommended remedy for worn silver plating on copper bus joints.