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BS 7671 sample questions

BS 7671 Knowledge Test

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Test your electrical knowledge and familiarity of BS 7671 with this new quiz.

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BS 7671 Knowledge Test

Test how familiar you are with BS 7671 2018 A2

BS 7671 page 68, Table 41.3

1 / 16

What is the maximum earth fault loop impedance (Zs) of a BS EN 60898 Type C 10 Amp MCB based on a maximum disconnection time of 0.4s?

2 / 16

What is the Correction Factor for cables in thermal insulation?

3 / 16

How would you regard BS 7671?

4 / 16

Which of the following offers overcurrent protection.

Arc Welders in general have a high inrush current.

5 / 16

Which curve type of MCB would be best suited for a 400V three phase Arc Welder?

BS 7671 regulation group 443.4 - Overvoltage Control, page 107.

6 / 16

For a domestic (dwelling) with an overhead line, what type of Surge Protection Device (SPD) is recommended at the origin of the installation?

BS 7671 regulation 544.1.1, page 205.

7 / 16

What is the maximum required CSA of a copper (Cu) Protective Bonding Conductor (which is not buried in the ground) on a TN-S earthing system?

BS 7671, page 64 regulation 411.3.2.2 and page 65 Table 41.1

8 / 16

What is the maximum disconnection time for a 16A 230V single phase radial final circuit suppling 13A socket-outlets on a TT earthing system?

9 / 16

A 32A, 30mA RCCB has an overcurrent protection rating of?

10 / 16

What does DNO stand for?

11 / 16

What is the maximum permissible earth fault loop impedance (Zs) of a BS EN 60947-2 63 Amp MCCB for a maximum disconnection time of 5s.

12 / 16

What does ADS stand for?

BS 7671, page 441, Table 4B2

13 / 16

Which is the Correction Factor (Rating Factor) for Ambient Ground Temperature?

BS 7671, page 442, Table 4B3

14 / 16

What does the Correction Factor Cs relate to?

15 / 16

What does PNB stand for?

BS 7671 page 443, Table 4C1

16 / 16

What is the Correction Factor Cg value for a group of 3 multicore-cables bunched in air, on a surface, embedded or enclosed?

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