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

A suitable reading during an end to end continuity test on a conductor would be

A reading of >100Ω during an end to end test on a conductor would indicate

A reading of 50MΩ could be displayed during which test

One reason for a continuity test on a ring final circuit is to ensure

A 230V ac circuit should have a minimum value of insulation resistance of

Where multiple circuits are tested for insulation resistance, the overall value compared to an individual circuit is likely to be

A polarity test on a line conductor goes low when switched on, then high when a switch is off. This is

The test to establish the effectiveness of a rod type connection to ground would be a

A satisfactory result on a 30mA RCD for additional protection, tested at 150mA would be

The breaking capacity of a protective device should be at least the value of this

A low resistance ohmmeter is the most suitable for continuity testing

An insulation resistance tester can prove continuity

A value of 0 Megohm could be expected when carrying out loop impedance testing

Prior to conducting a continuity test the value of test lead resistance should be measured and added to results

A high value of resistance during a continuity test could indicate a high resistance joint

A low value of insulation resistance could indicate a problem with the circuit

During a test of insulation resistance, a value of 50 Megohm is recorded this indicates the circuit is unacceptable

Where a high value of earth loop impedance is recorded, it could lead to quicker operation of protective devices

A 30mA RCD is tested at 150mA, it trips in 65ms. This acceptable according to BS7671

A polarity test shows the outer contact of an edison screw lampholder is connected to the line conductor, which is correct according to BS 7671