ADL 2391 Revision Questions 2 1003.pdf

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Question 27 State the maximum value of permitted earth electrode resistance for a TT system when protection is afforded by a 500mA r.c.d. GN3 Page 50 2.3 (Earth electrode for RCD’s) Table 2.3 Normal 100 Special locations 50 By calculation 50V/0.5A = 100 Dry 25V/0.5A = 50 Special Loc
Question 28 State the maximum recommended value of resistance for an earth electrode GN3 Page 53 2.3 (Earth electrode for RCD’s) Electrodes having resistances in excess of 200 will require further investigation. Note: Electrode resistances obtained in excess of 200 may indicate unstable soil conditions
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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
Page 13 and 14: Question 12 State in the correct se
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
Page 29: Question 27 State the action to be
Page 33 and 34: Question 30 State TWO reasons why i
Page 35 and 36: Question 32 Determine the prospecti
Page 37 and 38: Question 34 State the three require

ADL 2391 Revision Questions 2 1003.pdf

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