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Engineering EncyclopediaSaudi Aramco DeskTop Standards

Design And Application Of Equipment Grounding

Note: The source of the technical material in this volume is the Professional Engineering Development Program (PEDP) of Engineering Services. Warning: The material contained in this document was developed for Saudi Aramco and is intended for the exclusive use of Saudi Aramcos employees. Any material contained in this document which is not already in the public domain may not be copied, reproduced, sold, given, or disclosed to third parties, or otherwise used in whole, or in part, without the written permission of the Vice President, Engineering Services, Saudi Aramco.

Chapter : Electrical File Reference: EEX20502

For additional information on this subject, contact W.A. Roussel on 874-1320

Engineering Encyclopedia

Electrical Design and Application of Equipment Grounding

CONTENTS

PAGES

Locating Equipment Grounding Information...............................................................1 Basis For Installing Equipment Grounds In Saudi Aramco Electrical Systems .....................................................................................................................6 Determining The Equipment Grounding Requirements For Saudi Aramco Electrical Systems ......................................................................................15 Determining The Stationary Equipment Grounding Requirement For Saudi Aramco Electrical Installations.......................................................................27 Determining The Mobile Equipment Grounding Requirements For Saudi Aramco Electrical Installations.......................................................................38 Determining The Building And Structure Grounding Requirements For Saudi Aramco Installations ......................................................................................42 Determining The Lightning Protection Requirements For Saudi Aramco Installations.................................................................................................44 Determining The Static Grounding Requirements For Saudi Aramco Installations ..............................................................................................................54 Determining The Grounding Requirements For Saudi Aramco Offshore Platforms ...................................................................................................62 Determining The Grounding Requirements For Digital Equipment Used At Saudi Aramco Installations.........................................................................64 Work Aid 1: Saudi Aramco And Industry Standards Applicable To Equipment Grounding ..........................................................................67 Work Aid 2: Formula And Table Of Wire Sizes And Ampacity ................................68 Work Aid 3: Formula To Determine Conductor Size And References For Determining Stationary Equipment Grounding Requirements.......................................................................................74

Saudi Aramco DeskTop Standards

Engineering Encyclopedia

Electrical Design and Application of Equipment Grounding

Work Aid 4: Formula To Determine Conductor Size And References For Determining Mobile Equipment Grounding Requirements.......................................................................................75 Work Aid 5: References For Determining Building And Structure Grounding Requirements.....................................................................76 Work Aid 6: References For Determining Lightning Protection Requirements And Tables For Calculating Risk Index ........................77 Work Aid 7: References For Determining Static Grounding Requirements.......................................................................................80 Work Aid 8: References For Determining Offshore Platform Grounding Requirements.......................................................................................81 Work Aid 9: References For Determining Digital Equipment Grounding Requirements.......................................................................................82 Glossary...................................................................................................................83 Addendum A ............................................................................................................87

Saudi Aramco DeskTop Standards

Engineering Encyclopedia

Electrical Design and Application of Equipment Grounding

LOCATING EQUIPMENT GROUNDING INFORMATION The Engineer should consult the following Saudi Aramco Standards and Industry Standards for answers to questions on locating equipment grounding information: _ _ _ _ Saudi Aramco Design Practices Saudi Aramco Engineering Standards IEEE Standards National Electrical Code

Saudi Aramco Design Practices The Saudi Aramco Design Practice, SADP-P-111, applies to the design and the application of equipment grounding for Saudi Aramco electrical installations. The following chapters of SADP-P-111 contain information on equipment grounding: _ _ _ _ _Chapter 6

Chapter 6 Chapter 8 Chapter 9 Chapter 12 Chapter 13

Chapter 6 of SADP-P-111, titled "Equipment Grounding," discusses the specific Saudi Aramco requirements for the grounding of the metallic parts of equipment that does not normally carry current. The following specific topics are discussed in Chapter 6: _ _ _ _ _ _ _ _ _ _ _ _ _ General Requirements Generators and Motors Switchboards Transmission Substations Transmission Lines Overhead Distribution Industrial Plant Areas Distribution and Utilization - 600 V and Below Cable Sheaths Fences Instruments, Meters, Relays, Instrument Transformers Cable Trays Conduits

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Engineering Encyclopedia

Electrical Design and Application of Equipment Grounding

Saudi Aramco Design Practices (Cont'd) _ _ _ _Chapter 8

Cranes and Mechanical Handling Equipment Computer Installations Portable Equipment Lightning Protection

Chapter 8 of SADP-P-111, titled "Offshore Platforms," discusses the specific grounding practices for use on Saudi Aramco offshore platforms. The following specific topics are discussed in Chapter 8: _ _ _ _Chapter 9

General Requirements Grounding Electrode Grounding Conductors Installation

Chapter 9 of SADP-P-111, titled "Lightning Protection of Buildings and Structures," discusses the general lightning protection requirements for Saudi Aramco buildings and structures such as flag poles and floodlighting poles. Chapter 9 does not apply to the lightning protection requirements in substations or to the problems associated with flammable liquids or gases. The following specific topics are discussed in Chapter 9: _ _ _ _Chapter 12

General Requirements Need for Protection Materials Component Parts of a Lightning Protection System

Chapter 12 of SADP-P-111, titled "Communication Facility Grounding," discusses the design criteria for the grounding and the bonding of communication facilities. The following specific topics are discussed in Chapter 12: _ _ _ _ _ General Requirements Terminology Design Criteria Earth Resistance and Bonding Requirements Review and Adoption of GTE Practices

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Engineering Encyclopedia

Electrical Design and Application of Equipment Grounding

Saudi Aramco Design Practices (Cont'd)Chapter 13

Chapter 13 of SADP-P-111, titled "Safeguards Against Static Electricity, Lightning, and Stray Currents," describes current Saudi Aramco practices and requirements to safeguard against possible ignitions from static electricity, lightning, and stray currents when a hazard exists in the handling of flammable materials. Chapter 13 is intended to supplement but not to replace Article 250 (Grounding) of the National Electrical Code (NFPA 70), which deals with the protection of electrical installations by grounding or bonding. Chapter 13 also discusses the Saudi Aramco requirements to safeguard against possible degradation or possible failures, as a result of the presence of static electricity, of microelectronic components currently in use in communications and in process control computers. The following specific topics are discussed in Chapter 13: _ _ _ Definitions and Fundamentals General Requirements Protection of Specific Installations and Operations

Saudi Aramco Engineering Standards Saudi Aramco Engineering Standard SAES-P-111 applies to the design and application of equipment grounding for Saudi Aramco electrical installations. SAES-P-111 contains the minimum mandatory requirements for the design and the installation of equipment grounding. Any deviations from these requirements must have written approval from the Saudi Aramco Chief Engineer in Dhahran. User/specifier requirements that exceed the minimum requirements need no waiver approval even though they are different. SAES-P-111 contains the minimum mandatory requirements for the design and the installation of the following types of grounds: _ _ _ _ Equipment Grounding Fence Grounding Tank Grounding Lightning Protection

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Engineering Encyclopedia

Electrical Design and Application of Equipment Grounding

IEEE Standards IEEE Standards give information on how to This information is the consensus opinion of standard that applies to the design and the Standard 142. The following sections of equipment grounding: _ _Section 2

design, specify, test, and measure equipment. a group of subject matter experts. The IEEE application of equipment grounding is IEEE IEEE Standard 142 contain information on

Section 2 Section 3

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