Circuit Breaker Reference

Data record tests.insulation-resistance.equipment.breaker-oil.acceptance

Verified 2026-10-29 Confidence: High

Insulation Resistance is specified for medium-voltage and high-voltage oil circuit breakers in acceptance testing at clause 7.6.2.B.2 of ANSI/NETA ATS-2025. 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 and high-voltage oil circuit breakers

ProvenanceANSI/NETA ATS-2025 supports data record tests.insulation-resistance.equipment.breaker-oil.acceptance, which is cited on the entry Insulation Resistance.SOURCEANSI/NETA ATS-2025ANSI/NETA ATS-2025Licensed standard, clause 7.6.2.B.2DATA RECORDtests.insulation-resistance.equipment.breaker-oil.acceptancetests.insulation-resista..Verified 2026-10-29ENTRYInsulation ResistanceInsulation ResistanceNo revisions
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.
StepItemDetail
SourceANSI/NETA ATS-2025Licensed standard, clause 7.6.2.B.2
Data recordtests.insulation-resistance.equipment.breaker-oil.acceptanceVerified 2026-10-29
EntryInsulation ResistanceNo revisions
Subject
Insulation Resistance (Test methods)
Kind
Equipment fact
Source
ANSI/NETA ATS-2025, clause 7.6.2.B.2, Acceptance Testing Specifications for Electrical Power Equipment and Systems, NETA. Publisher page for ANSI/NETA ATS-2025Publisher information page
Also stated in
  • FIST 4-7, section 6.1.10.2, page 46 (August 2023).
    Read the reference passage

    6.1.10.2 Insulation Test

    "Standard insulation testing of circuit breakers uses high-voltage dc test equipment to test the insulation between each interrupter, the circuit breaker frame, and the contacts in the open position. This testing is suitable for most circuit breakers to verify that the insulation system of a circuit breaker is functional before bringing it into service. Insulation power factor testing is required for high voltage circuit breakers or for breakers that specify it in the manual."

    FIST 4-7, section 6.1.10.2, page 46, August 2023. Agency copy of FIST 4-7

    The current standard governs; this passage is a public-domain description of the practice dated August 2023.

History

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

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

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