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Contents 1 Safe testing 1

2 Features 3

3 Specification 6

4 Continuity (resistance) tests 9

4.1 Instrument layout 9

4.2 Test procedure 9

5 Insulation tests 11

5.1 The nature of insulation resistance 11

5.1.2 Capacitive current 11

5.1.3 Conduction current 12

5.1.4 Surface leakage current 12

5.1.5 Total leakage current 13

5.2 Damage to voltage sensitive equipment 13

5.3 Preparation for measurement 14

5.4 Insulation resistance measurement 14

6 Loop Impedance tests 17

6.1 Voltage measurement 17

6.2 What is earth fault loop impedance? 17

6.3 Automatic over temperature cut out 17

6.4 The loop impedance test 17

6.5 Loop impedance at 3 phase equipment 19

7 Prospective Short Circuit Current (PSC) tests 21

7.1 What is Prospective Short Circuit? 21

7 2 Testing Prospective Short Circuit Current 21

8 RCD tests 23

8.1 Purpose of RCD Test 23

8.2 What does the RCD test really do 23

8.3 RCD testing 23

8.4 Testing RCD's used to provide supplementary protection 24

8.5 Testing time delayed RCD's 25

8.6 Testing DC sensitive RCD's 25

9 General 26

10 Battery replacement 26

11 Fuse replacement 26

12 Servicing 27

13 Case and strap assembly 27

Kewtech KT62 User Manual

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