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ASME Y14.44 Reference Designations for Electrical and Electronics Parts and Equipment , 2008
- CONTENTS
- COMMITTEE ROSTER
- FOREWORD
- CORRESPONDENCE WITH THE Y14 COMMITTEE
- 1 GENERAL [Go to Page]
- 1.1 Scope
- 1.2 Application
- 1.3 References to This Standard
- 1.4 Changes in Reference Designation Class Letters
- 1.5 Use of "Shall," "Should," and "May"
- 1.6 Reference
- 1.7 Definitions
- 2 UNIT NUMBERING METHOD [Go to Page]
- 2.1 Basic Reference Designations [Go to Page]
- 2.1.1 Class Letter. [Go to Page]
- 2.1.1.1 Special Class Letter Considerations.
- 2.1.2 Number.
- 2.1.3 Sequential Number Assignment.
- 2.1.4 Suffix Letter.
- 2.1.5 Special Cases [Go to Page]
- 2.1.5.1 Terminals.
- 2.1.5.2 Sockets [Go to Page]
- 2.1.5.2.1 Single-Item Mounting.
- 2.1.5.2.2 Multiple-Item Mounting.
- 2.1.5.3 Connectors.
- 2.1.5.4 Supplementary Information.
- 2.1.5.5 Intersubassembly and Interunit Cable Connections.
- 2.1.5.6 Repeated-Use Circuits.
- 2.1.5.7 Selected and Matched Parts.
- 2.1.6 Reference Designations for Relays [Go to Page]
- 2.1.6.1 Class Letter.
- 2.1.6.2 Elements of Relays.
- 2.1.7 Reference Designations for Switches [Go to Page]
- 2.1.7.1 Class Letter.
- 2.1.7.2 Elements of Switches.
- 2.1.8 Actual Versus Intended Function.
- 2.2 Complete Reference Designations [Go to Page]
- 2.2.1 Systems, Sets, and Groups.
- 2.2.2 Units of a Set. [Go to Page]
- 2.2.2.1 Units of a Group.
- 2.2.2.2 Units Not Part of a Set.
- 2.2.3 Identification of Items in a Unit Which Are Not in a Subassembly. 1
- 2.2.4 Identification of Items of Subassemblies.
- 2.2.5 Expansion of Method.
- 2.2.6 Subassemblies and Parts Not Integral With Units.
- 2.2.7 Partial Reference Designations.
- 2.2.8 Special Cases [Go to Page]
- 2.2.8.1 Identical Units.
- 2.2.8.2 Identical Assemblies and Subassemblies.
- 2.2.8.3 Inseparable Subassemblies, Modular Assemblies, Printed Circuit Boards, and Integrated Circuit Packages.
- 3 LOCATION NUMBERING METHOD [Go to Page]
- 3.1 General
- 3.2 Sequential Numbering
- 3.3 Coordinate Numbering [Go to Page]
- 3.3.1 Coordinate Increments.
- 3.3.2 Coordinate Numbers.
- 3.4 Number Assignment
- 3.5 Area Identification
- 3.6 Location Assignment Drawings
- 3.7 Intermixing of Numbering Methods
- 3.8 Reuse of Numbers of Deleted Parts
- 3.9 Marking on Equipment
- 4 LOCATION CODING METHOD [Go to Page]
- 4.1 General
- 4.2 Sequential Coding
- 4.3 Coordinate Coding [Go to Page]
- 4.3.1 Coordinate Increments.
- 4.3.2 Coordinate Codes.
- 4.3.3 Number and Letter Assignment.
- 4.4 Additional Rules
- 4.5 Area Identification
- 4.6 Location Drawing
- 4.7 Intermixing of Methods
- 4.8 Reuse of Locations
- 4.9 Partial Location Codes
- 4.10 Connectors and Sockets
- 4.11 Levels With Adjacent Letters or Numbers
- 4.12 Rows and Columns
- 4.13 Marking on Equipment
- 5 DESIGNATION OF DEPOSITED COMPONENTS ON HYBRID PRINTED CIRCUITS
- 6 MARKING ON EQUIPMENT [Go to Page]
- 6.1 Marking Requirements for Reference Designations
- 6.2 Location of Markings [Go to Page]
- 6.2.1 Enclosed Parts.
- 6.2.2 Plug-In Subassemblies and Parts, Mounting Sockets, and Connectors.
- 6.2.3 Cable Assemblies.
- 6.3 Partial Reference Designations
- 6.4 Multiple-Use Assemblies
- 6.5 Functional Designations
- 7 CLASS DESIGNATION LETTERS
- FIGURES [Go to Page]
- 1 Typical Basic Reference Designations in a Diagram
- 2 Socket Reference Designations and Markings
- 3 Reference Designation in a Typical Schematic Diagram
- 4 Connector Designations for Plug-In Items
- 5 Typical Connector and Interunit Cable Designation
- 6 Physical and Circuit Relationship of N-Designated Circuit Groups
- 7 Typical System Subdivision
- 8 A Typical Set
- 9 Identification of Subassemblies and Parts of Units
- 10 Identification of Items of Subassemblies
- 11 Application of Reference Designations to a Unit
- 12 Intermixture of Unit Numbering Method and Location Numbering Method in the Same Unit
- 13 Typical First-Level Coordinate Number Assignment
- 14 Use of Suffix Letter to Locate Surfaces
- 15 Location Numbering Applied at Several Subdivision Levels
- 16 Coordinate First-Level Breakdown
- 17 Sequential-Type, First-Level Breakdown
- 18 Location Coding of Multiple Levels of Equipment
- 19 Coding of Panels
- 20 Identifiable Rows and Columns
- 21 Designation of Deposited Components on Hybrid Printed Circuits
- NONMANDATORY APPENDIX [Go to Page]
- A BLOCK NUMBERING METHOD [Go to Page]