Today in the shop I show how to perform NETA spec testing on low voltage (480V) molded-case thermal-magnetic circuit breakers. I cover the equipment you'll need, some theory, and how to read inverse-time overcurrent trip curves. After this you should be able to perform insulation resistance (megger), contact resistance (DLRO/Ductor), and primary current injection for some basic low-voltage breakes!
Timeline:
0:00 - Intro
7:35 - Equipment and Tools You'll Need
9:55 - Insulation Resistance Testing (Megger)
13:55 - Contact Resistance Testing (DLRO/Ductor)
16:15 - Interpreting Results
17:35 - High Current Test Set Controls
20:00 - Understanding Inverse-time Curves
28:00 - Performing Primary Current Injection Tests
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