Contact Resistance Testing - Watch Instant Video

Training Sessions

The Purpose of Contact Resistance Testing – 7 minutes
Describes the effect of resistance in circuit breaker and disconnect contacts. Describes common causes of contact resistance. Explains the purpose of contact resistance testing.

Test Equipment – 11 minutes
Describes the principle of contact resistance testing. Describes the components of a typical contact resistance test set.

Test Connections – 11 minutes
Describes the principle for connecting the current leads and voltage leads of a micro-ohmmeter to a resistance to be tested. Identifies the test connects for testing the contact resistance of a typical draw-out type circuit breaker. Identifies the test connections for testing the contact resistance of a typical high-voltage oil circuit breaker. Identifies the test connections for testing the contact resistance of a typical non-load-break disconnect switch.

Test Procedures and Results – 10 minutes
Describes common procedures and safety precautions for performing a contact resistance test. Explains the meanings of various test results.