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How this is calculated#

The tool gives the retest interval for portable electrical equipment. It checks test readings against the limits of AS/NZS 3760:2022. It does not print a tag.

1. Interval. You pick the environment, from 1 to 8. The tool reads the retest interval for that environment and the equipment class from Table 2.4.
2. Earth continuity. For Class I equipment, the tool reads the earth continuity limit from Cl 2.4.3.1 and compares your reading.
3. Insulation resistance. It reads the minimum insulation resistance for the equipment from Table 2.2. Your reading must not be lower.
4. Leakage current. Table 2.1 gives the leakage limit. The tool checks it only when you enter a reading.
5. RCD trip time. Table 2.3 gives the trip time limit for a portable or fixed RCD. A permanently wired RCD with external timing uses Cl 2.4.3.4.
6. Records. Cl 2.6.2 sets how long you keep the test record. The tool states that period.

Worked example#

• Class I equipment in environment 2. Environment 2 covers flexing cord, abuse or a hostile place. The retest interval is 12 months. The tool keeps the record for 7 years. An earth reading of 0.4 Ω passes against a limit of 1 Ω. An insulation reading of 25 MΩ passes against 1 MΩ.

Limits#

The tool reports the interval and compares the readings you type. It does not run a test. It does not print a tag. Cl 2.5.2.1 says what a tag must carry. Check the tag against that clause.

The tool gives one interval for one environment. Equipment used in more than one environment needs your own decision.

See also: Testing to Section 8, the test results checker and the assessment intervals tool.