C&G 2382 (BS7671 18th Edition) Appendices Practice Questions – Set 1
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You’ve demonstrated a good understanding of the Appendices of BS 7671 and how to find and apply the information they contain.
The appendices are an essential part of the Wiring Regulations, providing the reference tables, calculations and guidance that electricians rely on every day. A good understanding of them is a valuable skill.
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Not Quite This Time
Don’t worry if you didn’t get the result you were hoping for. The BS 7671 appendices contain a lot of technical information, and knowing where to find the right answer is just as important as remembering it.
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#1. Which external influence classification code would be used to identify a concern with sprays of water?
#2. Which one of the following would be the derating factor for a cable surrounded by thermal insulation for a length of 400 mm?
#3. When site-manufactured bespoke user instruction labels are being created, what would be the recommended minimum text size for general labels in a low contrast background?
#4. When designing the wiring system within a protected escape route and when used in conjunction with the manufacturer’s instructions, the use of which type of cable is unrestricted?
#5. Powertrack systems should be tested by the manufacturer to the standards specified within…
#6. Which signatories must be present on a completed Electrical Installation Certificate?
#7. Which standard provides a Code of practice for distribution of electricity on construction and building sites?
#8. To provide protection against overvoltage, which particular protective device would be the most appropriate to be used?
#9. When considering a 40 A Type B circuit-breaker compliant to BS EN 60898, what value of current would cause it to operate in 0.1-5 seconds?
#10. Which one of the following would the maximum voltage drop for a power circuit, supplied from a public distribution system?
#11. For the wiring of a radial final circuit, junction boxes with screw terminals must be…
#12. Which particular statutory regulation covers the distributor’s installation?
#13. Which Reference Method would be used to represent multicore cable, in cable trunking on a wooden or masonry wall, run horizontally?
#14. To identify the relationship of current-carrying capacity to other circuit parameters, symbols may be used. Which of the following symbols would represent the design current of the circuit?
#15. What is the rating factor for a 70 °C thermoplastic cable when installed in an ambient ground temperature of 30 °C?
#16. When considering a 20 A fuse compliant to BS 88.3, what value of current would cause it to operate in 0.2 seconds?
#17. When initially created, ring final circuits were designed to cover a floor surface area limit of…
#18. What would be the derating factor for 5 multicore cables, bunched in air?
#19. A single-core thermoplastic insulated cable, operating at 70 °C, is to be installed in conduit on a wall and used with a single-phase circuit. If a cross-sectional area of 6 mm2 is selected, what is the current-carrying capacity?
#20. Which one of the following would be the derating factor for a cable surrounded by thermal insulation for a length of 100 mm?
