Specifications

November 2002
Process Industry Practices Page 1 of 20
Process Industry Practices
Electrical
PIP ELCGL01
Electrical Design Criteria
Table of Contents
1. Introduction..................................3
1.1 Purpose ............................................. 3
1.2 Scope................................................. 3
2. References ...................................3
2.1 Process Industry Practices ................ 3
2.2 Industry Codes and Standards .......... 5
3. System Design Criteria................6
3.1 General .............................................. 6
3.2 Electrical Code Compliance............... 6
3.3 System Protection and
Coordination ...................................... 6
3.4 Utility Interface Parameters ............... 7
3.5 System Parameters ........................... 7
3.6 Steady State Voltage ......................... 7
3.7 Motor-Starting Voltage Drop.............. 7
3.8 Design Allowance .............................. 8
3.9 Power Factor ..................................... 8
3.10 Harmonics.......................................... 8
3.11 Electrical Equipment Rooms ............. 8
4. Electrical Area Classification......9
5. Power Distribution.......................9
5.1 System Configuration ........................ 9
5.2 Utility Interface and Unit Substations. 9
5.3 Transformers ................................... 10
5.4 Metering, Monitoring, and Relaying . 10
5.5 Switchgear....................................... 10
5.6 Switchgear and Substation
Batteries........................................... 11
5.7 Switchgear Buildings and
Enclosures....................................... 11
6. Motors......................................... 11
7. Motor Control............................. 11
7.1 Single-Phase Motor Control............. 11
7.2 480-Volt Motor Control..................... 11
7.3 Low-Voltage Adjustable
Speed Drives ................................... 12
7.4 Medium-Voltage Motor Control........ 12
8. Grounding .................................. 13
8.1 Substation........................................ 13
8.2 System Grounding ........................... 13
8.3 Equipment Grounding...................... 13
8.4 Plant Grounding System.................. 14
8.5 Static Electricity Grounding.............. 14
9. Lighting ...................................... 14
9.1 Illumination Levels ........................... 14
9.2 Luminaires and Circuits ................... 15
10.Power Receptacles and
Convenience Outlets................ 15
10.1 120-Volt Receptacles....................... 15