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BS 7671 IET Wiring Regulations Flashcards

5 cards from real PART P practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 5 BS 7671 IET Wiring Regulations flashcards as text

  1. What information must be provided on a circuit chart fixed inside a consumer unit?

    Answer: The purpose of each circuit, its protective device rating, cable size, and RCD assignment

    BS 7671 Regulation 514.9 requires a circuit chart (schedule of circuits) to be fixed inside or adjacent to the consumer unit, showing each circuit's purpose, cable size, protective device type and rating, and RCD assignment.

  2. What standard specifies requirements for consumer units in domestic installations?

    Answer: BS EN 61439-3 (consumer units for household and similar applications)

    Consumer units in domestic properties must comply with BS EN 61439-3, which specifies requirements for distribution boards for household and similar applications, including dual-RCD or RCBO-equipped designs.

  3. Why must domestic consumer units have metal enclosures (since 2016 amendment)?

    Answer: To reduce the risk of fire spreading from an arcing fault within the consumer unit to plastic and combustible materials

    Following a 2016 amendment to BS 7671, domestic consumer units must have enclosures made of non-combustible material (metal), as arc faults in plastic units had been identified as a cause of fires.

  4. What is an AFDD (Arc Fault Detection Device)?

    Answer: A device that detects the electrical signatures of dangerous arcing faults in a circuit and disconnects it before a fire can start

    An AFDD detects the characteristically irregular current waveforms produced by dangerous electrical arcing in cables and connections, disconnecting the circuit before the arc can ignite surrounding materials and start a fire.

  5. What is a surge protective device (SPD) and when must it be provided under BS 7671 18th Edition?

    Answer: A device that protects equipment from transient overvoltages (surges); required where the consequence of a surge would result in serious injury or loss of life, or significant financial loss

    BS 7671 Regulation 443.4 and 534 require SPDs where the risk assessment concludes that damage from surge could result in injury to persons, interruption to public services, loss of critical data or significant financial loss.