Inspection and Testing Sample questions

1. The non-statutory document that is applicable to the probes and leads of test equipment is:

• a. HSE Guidance Note GS 38

• b. BS7671

• c. The IET On Site Guide

• d. IET Guidance Note 3.

The following tests may be carried out on a new installation:

1. polarity

2. insulation resistance

3. ring final circuit continuity

4. cpc continuity.

The relevant test in the correct sequence for a new ring final circuit are:

• a. 2,1,4

• b. 1,2,4,3

• c. 3,1,2

• d. 3,2,1.

3. If the length of a cable is doubled the insulation resistance will be:

• a. quartered

• b. halved

• c. remain the same

• d. doubled.

4. If the length of a cable is doubled the resistance will be:

• a. quartered

• b. halved

• c. remain the same

• d. doubled.

5. When carrying out an initial verification, a check for polarity is carried out when energising of the installation for the first time. This is to confirm:

• a. correct connection of the incoming supply

• b. correct connection of equipment

• c. operation of the main isolator

• d. operation of the supply fuse.

6. A continuity of protective conductors test is carried out using a:

• a. continuity tester

• b. low reading ohmmeter

• c. low resistance ohmmeter

• d. insulation tester.

7. An increase in conductor operating temperature will result in:

• a. an decrease in conductor resistance

• b. an increase in conductor resistance

• c. an increase in insulation resistance

• d. no apparent change in resistance or insulation resistance.

8. The maximum permitted voltage drop for a low voltage lighting circuit supplied directly from the public supply is:

• a. 2%

• b. 3%

• c. 4%

• d. 5%.

9. External earth fault loop impedance Z_e for an installation must be measured at:

• a. a convenient point on the installation with the earthing conductor connected

• b. a convenient point on the installation with the earthing conductor disconnected

• c. the origin of the installation with the earthing conductor connected

• d. the origin of the installation with the earthing conductor disconnected.

10. The maximum tabulated earth fault loop impedance value for a 32A Type C circuit breaker to BS EN 60898 is 0.68Ω. The maximum measured earth fault loop impedance permitted for a circuit protected by this device is:

• a. 0.40Ω

• b. 0.54Ω.

• c. 0.68Ω

• d. 0.82Ω