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ENGINEERING STANDARD FOR ELECTRICAL SYSTEM DESIGN (INDUSTRIAL AND NON-INDUSTRIAL) ORIGINAL EDITION DEC. 1997


IPS-E-EL-100



This Standard is the property of Iranian Ministry of Petroleum. All rights are reserved to the owner.
Neither whole nor any part of this document may be disclosed to any third party, reproduced, stored
in any retrieval system or transmitted in any form or by any means without the prior written consent
of the Iranian Ministry of Petroleum.









ENGINEERING STANDARD

FOR

ELECTRICAL SYSTEM DESIGN

(INDUSTRIAL AND NON-INDUSTRIAL)

ORIGINAL EDITION

DEC. 1997


Dec. 1997

IPS-E-EL-100



1
CONTENTS : PAGE No.

0. INTRODUCTION ............................................................................................................................. 2
PART 1 ELECTRICAL SYSTEM DESIGN INDUSTRIAL ......................................................... 3
PART 2 ELECTRICAL SYSTEM DESIGN NON-INDUSTRIAL.............................................. 45

APPENDICES

APPENDIX A ROTATING ELECTRIC MACHINES ..................................................................... 62
APPENDIX B SWITCHGEAR AND CONTROLGEAR................................................................. 72
APPENDIX C TRANSFORMERS ................................................................................................. 87
APPENDIX D BATTERIES, CHARGERS AND UPS ................................................................. 101
APPENDIX E STATIC POWER FACTOR CORRECTION EQUIPMENT .................................. 108
APPENDIX F HEAT TRACING................................................................................................... 119
APPENDIX G LIGHTING AND WIRING..................................................................................... 133
APPENDIX H POWER CABLES ................................................................................................ 143
APPENDIX I EARTHING BONDING AND LIGHTENING PROTECTION ................................ 175

Dec. 1997

IPS-E-EL-100



2
0. INTRODUCTION
This Standard is written in two parts and 9 Appendices as described below:
Part 1
Electrical System Design Industrial
Part 2
Electrical System Design Non-Industrial
Appendices:
Appendix A

Rotating Electric Machines
Appendix B

Switchgear and Controlgear
Appendix C

Transformers
Appendix D

Batteries, Chargers and UPS
Appendix E

Static Power Factor Correction Equipment
Appendix F

Heat Tracing
Appendix G

Lighting and Wiring
Appendix H

Power Cables
Appendix I

Earthing Bonding and Lightening Protection
The above mentioned standards specifies the minimum requirement for electrical design in
industrial and non-industrial installation and they should not prevent the designers from further
considerations on subject matters.

Dec. 1997

IPS-E-EL-100



3









PART 1

ELECTRICAL SYSTEM DESIGN

INDUSTRIAL

Dec. 1997

IPS-E-EL-100



4
CONTENTS :

PAGE No.

1. SCOPE ............................................................................................................................................ 6

2. REFERENCES ................................................................................................................................ 6

3. UNITS.............................................................................................................................................. 6

4. ENVIRONMENTAL AND SITE FACTORS..................................................................................... 6

5. BASIC DESIGN CONSIDERATION ............................................................................................... 7

5.1 General..................................................................................................................................... 7

5.2 Planning Guide for Distribution Design................................................................................ 7

5.3 General Layout ........................................................................................................................ 8

5.4 Type of Circuit Arrangements ............................................................................................... 8

5.5 Flexibility.................................................................................................................................. 9

5.6 System Reliability ................................................................................................................... 9

5.7 Selection of Equipment .......................................................................................................... 9

6. LOAD .............................................................................................................................................. 9

6.1 Rating and Diversity Factors ................................................................................................. 9

6.2 Types of Loads........................................................................................................................ 9

7. POWER SUPPLY SOURCES....................................................................................................... 10

7.1 General................................................................................................................................... 10

7.2 Emergency Power Supply Equipment ................................................................................ 11

7.3 Primary Substation ............................................................................................................... 11

7.4 Synchronizing ....................................................................................................................... 12

7.5 Secondary Unit Substations ................................................................................................ 12

8. LOAD-CENTER SYSTEMS .......................................................................................................... 12

9. SELECTION OF SYSTEM VOLTAGE.......................................................................................... 13

9.1 Voltage Levels ....................................................................................................................... 13

9.2 The Factors Affecting System Voltage ............................................................................... 13

9.3 System Voltage Variation..................................................................................................... 14

9.4 Motor Starting Voltage Drop ................................................................................................ 14

10. POWER DISTRIBUTION SYSTEMS .......................................................................................... 17

10.1 General................................................................................................................................. 17

10.2 Radial Systems.................................................................................................................... 17

10.3 Single Radial........................................................................................................................ 17

10.4 Double Radial ...................................................................................................................... 17

10.5 Triple Radial......................................................................................................................... 17

10.6 Ring Fed Systems ............................................................................................................... 18

10.7 Automatic Transfer Schemes ............................................................................................ 18

11. POWER FACTOR IMPROVING EQUIPMENT........................................................................... 21

12. SIZING OF ELECTRICAL EQUIPMENT AND CABLES ........................................................... 22

12.1 Sizing of Electrical Equipment .......................................................................................... 22

12.2 Cable Sizing......................................................................................................................... 23

13. POWER SYSTEM FAULT CONSIDERATIONS ........................................................................ 25

13.1 Fault Calculations ............................................................................................................... 25

13.2 Equipment Fault Current Ratings...................................................................................... 25

13.3 Methods of Limiting Fault Currents ..................