pccel001 - instrumentation electrical requirements

Download PCCEL001 - Instrumentation Electrical Requirements

Post on 07-Apr-2015

2.287 views

Category:

Documents

14 download

Embed Size (px)

TRANSCRIPT

December 1999

Process Industry Practices Process Control

PIP PCCEL001 Instrumentation Electrical Requirements

PURPOSE AND USE OF PROCESS INDUSTRY PRACTICES In an effort to minimize the cost of process industry facilities, this Practice has been prepared from the technical requirements in the existing standards of major industrial users, contractors, or standards organizations. By harmonizing these technical requirements into a single set of Practices, administrative, application, and engineering costs to both the purchaser and the manufacturer should be reduced. While this Practice is expected to incorporate the majority of requirements of most users, individual applications may involve requirements that will be appended to and take precedence over this Practice. Determinations concerning fitness for purpose and particular matters or application of the Practice to particular project or engineering situations should not be made solely on information contained in these materials. The use of trade names from time to time should not be viewed as an expression of preference but rather recognized as normal usage in the trade. Other brands having the same specifications are equally correct and may be substituted for those named. All Practices or guidelines are intended to be consistent with applicable laws and regulations including OSHA requirements. To the extent these Practices or guidelines should conflict with OSHA or other applicable laws or regulations, such laws or regulations must be followed. Consult an appropriate professional before applying or acting on any material contained in or suggested by the Practice.

Process Industry Practices (PIP), Construction Industry Institute, The University of Texas at Austin, 3208 Red River Street, Suite 300, Austin, Texas 78705. PIP member companies and subscribers may copy this Practice for their internal use.

Not printed with State funds

December 1999

Process Industry Practices Process Control

PIP PCCEL001 Instrumentation Electrical RequirementsTable of Contents 1. Introduction ..................................21.1 Purpose ............................................2 1.2 Scope ...............................................2

8. Terminations .............................. 158.1 General .......................................... 15 8.2 Milliamp Signals - Typically 4 to 20 mA ............................................ 15 8.3 Voltage Signals - 100 mV or Greater........................................... 15 8.4 Voltage Signals - Less than 100 mV........................................... 16 8.5 Thermocouple Signals.................... 16

2. References....................................22.1 Process Industry Practices ................2 2.2 Industry Codes and Standards ..........2 2.3 Government Regulations ..................4

3. Definitions.....................................4 4. General..........................................5 5. Environmental ..............................6 6. Instrument Signal Compatibility ...............................6 7. Wire and Cable Systems..............77.1 General.............................................7 7.2 Instrument Wiring .............................7 7.3 Segregation/Separation Requirements .................................11 7.4 Cable Tray ......................................11 7.5 Conduit Systems.............................11 7.6 Junction Boxes ...............................12

9. Instrument Power Systems ....... 169.1 General .......................................... 16 9.2 Branch Circuits Design ................... 17

10. Grounding ................................. 18 11. Intrinsically Safe Instrument Systems..................................... 19 12. Non-Incendive Systems ........... 19 13. Control Panel and Cabinet Wiring ........................................ 20 14. Installation................................. 20 Figure 1:Typical Instrument Systems Power/Grounding Requirements

Process Industry Practices

Page 1 of 20

PIP PCCEL001 Instrumentation Electrical Requirements

December 1999

1.

Introduction1.1 Purpose The purpose of this Practice is to provide electrical requirements for process measurement and control systems. 1.2 Scope This Practice provides the requirements for the equipment selection, system design, and installation of electrical supply and wiring to support process measurement and control systems.

2.

ReferencesApplicable requirements in the latest edition (or the edition indicated) of the following industry codes, standards, and references shall be considered an integral part of this Practice. Short titles will be used herein when appropriate. 2.1 Process Industry Practices (PIP) 2.2 PIP ELSWC03 - 600 Volt Power and Control Cable PIP ELSWC03D - Data Sheet for 600 Volt Power and Control Cable PIP ELSWC05 - 300 Volt Instrumentation Tray Cable PIP ELSWC05D - Data Sheet for 300 Volt Instrumentation Tray Cable PIP PCCGN001 - General Instrument Design Checklist PIP PCCGN002 - General Instrument Installation Criteria PIP PCESS001 - Safety Systems Guidelines PIP PCIEF000 - Instrumentation Fabrication Details PIP PCIEL000 - Instrumentation Electrical Details PIP PCSCB001 - Control Building Considerations Specification PIP PCSEL003 - Instrument Junction Boxes Specifications

Industry Codes and Standards American Petroleum Institute (API) API RP500 - Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class 1, Division 1 and Division 2 API RP505 - Recommended Practice for the Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class 1, Zone 0, Zone 1, and Zone 2 API RP552 - Transmission Systems API RP554 - Process Instrumentation and Control

Page 2 of 20

Process Industry Practices

December 1999

PIP PCCEL001 Instrumentation Electrical Requirements

Institute of Electrical and Electronic Engineers (IEEE) IEEE 518 - IEEE Guide for the Installation of Electrical Equipment to Minimize Electrical Noise Inputs to Controllers from External Sources IEEE 1100 - Recommended Practice for Powering and Grounding Sensitive Electronic Equipment, The Emerald Book

ISA ISA RP12.1 - Definitions and Information Pertaining to Electrical Instruments in Hazardous (Classified) Locations ISA RP12.6 - Wiring Practices for Hazardous (Classified) Locations Instrumentation Part 1: Intrinsic Safety ISA RP60.8 - Electrical Guide for Control Centers ISA S12.1 - Definitions and Information Pertaining to Electrical Instruments in Hazardous (Classified) Locations ISA S12.6 - Installation of Intrinsic Safe Systems for Hazardous (Classified) Locations ISA S12.10 - Area Classification in Hazardous (Classified) Dust Locations ISA S12.12 - Nonincendive Electrical Equipment for Use in Class I and II Division 2 and Class III Divisions 1 and 2 Hazardous (Classified) Locations ISA S50.1 - Compatibility of Analog Signals for Electronic Industrial Process Instruments ISA S84.01 - Application of Safety Instrumented Systems for the Process Industries ISA Comprehensive Dictionary of Measurement and Control

National Electric Manufacturers Association (NEMA) NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum) NEMA ICS6 - Enclosures for Industrial Control and Systems NEMA VE2 - Metal Cable Tray Installation Guidelines

National Fire Protection Association (NFPA) NFPA 70 - National Electrical Code (NEC) NFPA 496 - Purged and Pressurized Enclosures for Electrical Equipment NFPA 497 - Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas NFPA 499 - Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas

Process Industry Practices

Page 3 of 20

PIP PCCEL001 Instrumentation Electrical Requirements

December 1999

2.3

Government Regulations Federal Standards and Instructions of the Occupational Safety and Health Administration, including any requirements by state or local agencies with jurisdiction, shall apply. United States Department of Labor, Occupational Safety and Health Administration (OSHA) OSHA 29 CFR 1910 - Occupational Safety and Health Standards

3.

DefinitionsAC Safety Ground: The grounding system required by NEC Article 250 to provide protection for personnel and electrical equipment. The Instrument Ground Bus is connected to the Safety Ground per the NEC requirements. Control Room: The location where direct operation of the unit or plant is performed and where operations personnel are in constant attendance Field Instrument Enclosure: The term used in the generic sense to indicate a cabinet or building that houses instruments and/or wiring termination external to Instrument Rooms or Control Buildings Field Junction Box (JB): See Junction Box Field-Powered Devices: Instruments located in the field that are powered from sources other than the Basic Process Control System (BPCS) and/or Safety Instrumented System (SIS). These are sometimes referred to as 4-wire devices. Interface Box or Marshalling Cabinet: See Junction Box Instrument Rooms: The term used in the generic sense for a walk-in type structure, including rack rooms, remote instrument enclosures, or any completely enclosed structure that houses control equipment Instrument Ground Bus (IGB): Grounding system connected to a high-quality earth ground, independent from the AC Safety Ground, for all instrumentation signals. The IGB is tied to the AC Safety Ground at only one point, near a high-quality earth ground, per NEC an

Recommended

View more >