ADL 2391 Revision Questions 2 1003.pdf

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Question 29 State the formula used to calculate Impedance Zs, at the furthest point within a circuit GN3 Page 53 2.7.14 (Earth fault loop) Zs = Ze + (R 1 +R 2 ) Where Ze is by measurement or enquiry and (R 1 +R 2 ) by measurement
Question 30 State TWO reasons why it is necessary to measure external earth fault loop impedance at the origin of an installation GN3 Page 53 2.7.14 (Determining Ze) 1. To verify an earth connection 2. The value is equal to or less than the value determined by the designer
Page 1 and 2: Question 1 State the necessary acti
Page 3 and 4: Question 3 Why is it necessary to u
Page 5 and 6: Question 5 Identify FIVE non-statut
Page 7 and 8: Question 7 Appendix 6 of BS 7671 al
Page 9 and 10: Question 9 State the information th
Page 11 and 12: Question 10 Where should the propos
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Page 15 and 16: Question 14 State the British Stand
Page 17 and 18: Question 16 Identify the TWO proced
Page 19 and 20: Question 17 cont’d GN3 Page 33 (C
Page 21 and 22: Question 19 Identify ONE other test
Page 23 and 24: Question 21 State the test voltage
Page 25 and 26: Question 23 State the type of test
Page 27 and 28: Question 25 Identify the test that
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Page 35 and 36: Question 32 Determine the prospecti
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ADL 2391 Revision Questions 2 1003.pdf

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