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, 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. 


Refer to: 

Wiring rules (a) & ( b)

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