Data record `tests.insulation-resistance.equipment.breaker-mv-air.maintenance`

Verified 2026-10-29 Confidence: High

Insulation Resistance is specified for medium-voltage air circuit breakers in maintenance testing at clause 7.6.1.3.B.2 of ANSI/NETA MTS-2023. The clause calls for a one-minute insulation-resistance test on each pole, phase-to-phase and phase-to-ground with the breaker closed and across each open pole, at the manufacturer's test voltage.

Value: medium-voltage air circuit breakers

Provenance. Where this record comes from and where it is used: the cited source, the record itself and the entry that cites it.

Provenance: the chain from source to entry.
Step	Item	Detail
Source	ANSI/NETA MTS-2023	Licensed standard, clause 7.6.1.3.B.2
Data record	tests.insulation-resistance.equipment.breaker-mv-air.maintenance	Verified 2026-10-29
Entry	Insulation Resistance	No revisions

Subject

Insulation Resistance (Test methods)

Kind

Equipment fact

Source

ANSI/NETA MTS-2023, clause 7.6.1.3.B.2, Maintenance Testing Specifications for Electrical Power Equipment and Systems, NETA. Publisher page for ANSI/NETA MTS-2023 Publisher information page

Also stated in

Stated independently by FIST 3-16, section 5.2.4, page 39 (May 2024).
Read the reference passage

5.2.4 Insulation Resistance Test

"Measure the insulation resistance of each pole for 1 minute at an applied voltage that is in accordance with the manufacturer's O&M manual or a minimum of two times the rated voltage plus 1,000 volts, up to 10 kV. The test should be performed on individual poles with the breaker closed and the unused poles and frame grounded. An additional test should be performed with the breaker open and one side of the breaker grounded to measure the open poles."

FIST 3-16, section 5.2.4, page 39, May 2024. Agency copy of FIST 3-16

The current standard governs; this passage is a public-domain description of the practice dated May 2024.

History

Every recorded change to this data record, oldest first.
Date	Change
2026-10-29	created

Cite this page

Cite the governing standard for the fact itself; cite this page as the finding aid.

"Data record tests.insulation-resistance.equipment.breaker-mv-air.maintenance." Circuit Breaker Reference. 2026-10-29. https://www.circuitbreakerreference.com/data/tests.insulation-resistance.equipment.breaker-mv-air.maintenance/.

Circuit Breaker Reference, Data record tests.insulation-resistance.equipment.breaker-mv-air.maintenance (Oct. 29, 2026), https://www.circuitbreakerreference.com/data/tests.insulation-resistance.equipment.breaker-mv-air.maintenance/.

@misc{etr-data-tests-insulation-resistance-equipment-breaker-mv-air-maintenance,
  title = {Data record tests.insulation-resistance.equipment.breaker-mv-air.maintenance},
  howpublished = {\url{https://www.circuitbreakerreference.com/data/tests.insulation-resistance.equipment.breaker-mv-air.maintenance/}},
  organization = {Circuit Breaker Reference},
  publisher = {Circuit Breaker Reference},
  year = {2026},
  note = {last substantive change 2026-10-29}
}

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