Inspection and testing - 3

Identify the information you should have available before the inspection and test of a new installation

• Total fault loop impedance

• RCD disconnection times

• External loop impedance

• r1+r2 circuit values

BS7671 states that the top surface of electrical equipment shall meet the requirements of:

• IP4X

• IPX4

• IPX2

• IP2X

BS 7671: 2018 states that the minimum insulation resistance value for a 230v AC circuit must be no less than

• 0.5 Mega ohm

• 2 Mega ohm

• 200 Mega ohm

• 1 Mega ohm

If the cross sectional area (csa) of a conductor remains the same but its length reduces, its resistance will

• Increase

• Decrease

• Remain the same

• Reduce to zero

Identify the test voltage for insulation resistance for a 400v AC 3-phase circuit

• 750V

• 250V

• 1000V

• 500V

Carrying out a total earth fault loop impedance test on a A1 ring circuit can be best accomplished with the availability of

• The previous test results

• A wander lead

• a set of shorting leads

• A BS1363 accessory

Before carrying out 'live' testing of an installation, you must

• Remove all protective devices

• Inform other people who are in the area

• Remove all accessory covers

• Isolate the mains supply at the origin

Identify the easiest method of determining the correct polarity on an A1 ring circuit

• During total earth fault loop impedance test

• During (r2) continuity test

• During dedicated polarity test

• During continuity of ring test

If the cross sectional area (csa) of a conductor decreases and its length remains the same, its resistance will

• Remain the same

• Reduce to zero

• Decrease

• Increase

When measuring total earth fault loop impedance on a live circuit, results can quickly be verified by comparing results with..

• Values in BS7671:2018 regulations book tables

• Values in BS7671:2018 Onsite guide tables

• Values in previous schedule of test results

• Values provided by the installation designer