Testing

A low resistance ohmmeter is suitable for measuring insulation resistance

An approved voltage indicator (non-electronic) should always be checked with a proving unit or known supply

The maximum value of insulation resistance on a 230V system is 1MΩ

An RCD tester shows results in mA

An approved voltage indicator (non-electronic) should have fused test leads

Testing will prove the correct csa of conductor has been selected

It is permissible to split larger installations into sections when conducting Insulation resistance tests

EAWR (1989) requires all test instruments to be maintained

All protective conductors must be tested for continuity with an insulation resistance tester

A ring-final circuit test should prove no interconnections are present