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Insulation Resistance

The insulation resistance between the conductors of consumer mains and submains; and live and earthed parts of an electrical installation, or parts thereof, including consumer mains and submains, shal

Jason Bright

Updated 18 February 2026
The insulation resistance between the conductors of consumer mains and submains; and live and earthed parts of an electrical installation, or parts thereof, including consumer mains and submains, shall be no less than 1 MOhm.
For shorter cable runs, the insulation resistance should be significantly greater than 1 MOhm. On an average installation a reading in the 100's of MOhms would be expected.
Wiring rules 8.3.6.3 (a) & ( b)

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