Module 2 Test: Basic Electrics & Building Regulations

1. A metal consumer unit and metal socket fronts that you installed are examples of what?

   A. Extraneous conductive parts B. Exposed conductive parts C. Circuit protective conductors D. Main earthing terminals
2. A TN-C-S supply has 25 mm² meter tails. What is the usual size of the main protective bonding conductors?

   A. 16 mm² B. 25 mm² C. 6 mm² D. 10 mm²
3. The incoming water service pipe is blue plastic all the way to the stopcock. What bonding does it need?

   A. No main bonding is required B. An earth electrode C. 10 mm² main bonding within 600 mm D. 6 mm² supplementary bonding
4. Where does the 50 V touch voltage figure come from for a 30 mA RCD?

   A. 50 mA × 1000 Ω B. 230 V × 0.03 × 7.25 C. 0.03 A × 1667 Ω D. 1667 ÷ 30
5. Which is NOT one of the three conditions for leaving out supplementary bonding in a bathroom?

   A. All circuits meet automatic disconnection of supply B. All circuits have 30 mA RCD additional protection C. All extraneous parts are connected to main protective bonding D. All cables are run in metal conduit
6. Which installation reference method generally gives a cable its HIGHEST current rating?

   A. Method A – in conduit in an insulated wall B. Method B – in conduit on a wall C. Method C – clipped direct D. Method 103 – surrounded by thermal insulation
7. What is the maximum floor area served by a 20 A radial circuit in 2.5 mm² cable?

   A. 50 m² B. 75 m² C. 100 m² D. 125 m²
8. Which relationship must be true when selecting a cable?

   A. In ≤ Ib ≤ Iz B. Ib ≤ In ≤ Iz C. Iz ≤ In ≤ Ib D. Ib ≤ Iz ≤ In
9. A 7.2 kW shower on 230 V: what is the design current Ib?

   A. 40.00 A B. 26.10 A C. 31.30 A D. 32.00 A
10. A 20 m radial carries 30 A in cable rated 7.3 mV/A/m. What is the voltage drop?

    A. 4.38 V B. 7.30 V C. 43.80 V D. 2.19 V
11. In = 40 A, Ca = 0.94 and Cg = 0.70. What is Iz?

    A. 42.55 A B. 26.32 A C. 40.00 A D. 60.79 A
12. Which correction factor applies to a circuit protected by a BS 3036 rewireable fuse?

    A. Cc = 0.9 B. Cf = 0.725 C. Ca = 0.94 D. Cg = 0.7
13. A ring final circuit has 6 socket-outlets. What is the maximum number of UNFUSED spurs?

    A. 3 B. 6 C. 12 D. Unlimited
14. Why does voltage drop for a ring final circuit divide by 4000 instead of 1000?

    A. Ring cables are 4 mm² B. The ring uses a 40 A breaker C. Rings are always 4 times longer D. A ring has four paths: two line legs and two neutral legs
15. Cables feeding an immersion heater or boiler should be able to withstand at least what temperature?

    A. 60 °C B. 70 °C C. 90 °C D. 120 °C
16. In the old (pre-2004) colours, which conductor was BLACK?

    A. Neutral B. Protective conductor C. Line 1 D. Line 2
17. What minimum IP rating is required for fixed equipment in bathroom zone 1 (not cleaned with jets)?

    A. IPX4 B. IPX5 C. IP66 D. IPX2
18. In a 3-plate ceiling rose, which terminal takes the permanent line from the supply and the outgoing cable?

    A. Earth B. L (switch line) C. LOOP D. N
19. What cable links two two-way switches, and what are its cores called?

    A. Flex – tails B. SWA – armour C. Twin & earth – switch lines D. 3-core & earth – strappers
20. What is the maximum voltage for ELV (extra-low voltage) AC?

    A. 24 V B. 50 V C. 120 V D. 12 V

Unofficial practice questions written from the Module 2 study notes, not from the awarding body's exam. Always check against your course books and BS 7671.

← All modules