SZNS SANS 10142-2:2018 The wiring of premises Part 2: Medium-voltage installations above 1 kV a.c. not exceeding 22 kV a.c. and up to and including 3 MVA installed capacity

Description

This part of SANS 10142 covers requirements for the design, erection and modification of specific, fixed, medium-voltage electrical installations in distribution systems between the point of control and the point of consumption, with nominal voltages above 1kV a.c. not exceeding 22 kV a.c. and up to and including 3 MVA installed capacity, so as to provide safe and proper functioning for the use intended.

Contents                                                                                                                         Page

Introduction…………………………………………………………………………………………………………………….. 1

Scope……………………………………………………………………………………………………………………………….. 3

2.Normative references………………………………………………………………………………………………….. 3

2.2 IEC standards…………………………………………………………………………………………………………….. 7

3 Definitions……………………………………………………………………………………………………………………. 7

3.1 General definitions……………………………………………………………………………………………………. 7

3.2 Installation definitions……………………………………………………………………………………………… 8

3.3 Definitions on types of installation………………………………………………………………………….. 8

3.4 Definitions on safety measures against electric shock……………………………………………. 9

3.5 Clearances definitions……………………………………………………………………………………………….. 9

3.6 Earthing definitions…………………………………………………………………………………………………… 10

3.7 Person definitions……………………………………………………………………………………………………… 11

3.8 Abbreviations…………………………………………………………………………………………………………….. 12

4 Requirements………………………………………………………………………………………………………………… 12

4.1 General safety requirements………………………………………………………………………………………. 12

4.2 Safety report………………………………………………………………………………………………………………… 12

4.3 Applicable standards…………………………………………………………………………………………………….12

4.4 Notices, labels and rating plates…………………………………………………………………………………..15

5 Design………………………………………………………………………………………………………………………………. 15

5.1 Electrical design…………………………………………………………………………………………………………….. 15

5.2 Mechanical design………………………………………………………………………………………………………….19

5.5 Clearance distances………………………………………………………………………………………………………..20

5.6 External fences, walls, access doors and barriers………………………………………………………… 21

5.7 Climatic and environmental conditions………………………………………………………………………. 21

5.8 Electrical protection systems……………………………………………………………………………………….. 21

5.9 Audible noise levels……………………………………………………………………………………………………..  22

5.10 Notices, labelling and indicators………………………………………………………………………………. 22

6 Installation………………………………………………………………………………………………………………………. 23

6.1 Existing installations……………………………………………………………………………………………………. 23

6.2 Installation of a neutral earth and bonding……………………………………………………………….. 24

6.3 Installation of overhead structures……………………………………………………………………………… 24

6.4 Installation of transformers…………………………………………………………………………………………. 24

6.5 Installation of metal-enclosed switchgear………………………………………………………………….. 24

6.6 Installation of power cables…………………………………………………………………………………………. 24

6.7 Installation of surge arresters………………………………………………………………………………………. 25

6.8 Installation of power capacitors. …………………………………………………………………………………..25

6.9 Installation of generating machines. ……………………………………………………………………………25

6.10 Power line crossings…………………………………………………………………………………………………… 25

6.11 Protection against leakage of insulating liquid………………………………………………………… 25

6.12 Installations that use SF6 as insulating medium……………………………………………………….26

6.13 Notices, labels and rating plates……………………………………………………………………………… 26

7 Testing and measurement ……………………………………………………………………………………………..26

7.1 Earthing system………………………………………………………………………………………………………….. 26

7.2 Testing of the fixed electrical installation…………………………………………………………………. 26

7.3 Testing of transformers……………………………………………………………………………………………… 27

7.4 Testing of switchgear…………………………………………………………………………………………………. 27

7.5 Testing of cables…………………………………………………………………………………………………………. 27

7.6 Testing of batteries…………………………………………………………………………………………………….. 27

8 Commissioning……………………………………………………………………………………………………………….. 27

9 Documentation………………………………………………………………………………………………………………. 27

9.1 Design stage……………………………………………………………………………………………………………….. 27

9.2 Type-test reports………………………………………………………………………………………………………… 27

9.3 Routine test certificates. ……………………………………………………………………………………………..28

9.4 Contract completion stage…………………………………………………………………………………………. 28

9.5 As-built drawings……………………………………………………………………………………………………….. 28

9.6 Operational manuals. ………………………………………………………………………………………………….28

9.7 Maintenance manuals………………………………………………………………………………………………… 28

10 General safety measures. ………………………………………………………………………………………………28

Annex A……………………………………………………………………………………………………………………………… 29

Annex B……………………………………………………………………………………………………………………………… 29

Bibliography………………………………………………………………………………………………………………………. 33