1、 CHECK THE MASTER LIST VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE MSFC - Form 454 (Rev. October 1992) MSFC-STD-3631 National Aeronautics and BASELINE Space Administration EFFECTIVE DATE: July 19, 2011 George C. Marshall Space Flight Center Marshall Space Flight Center, Alabama 35812 ES42 MSF
2、C TECHICAL STANDARDS MSFC ELECTRICAL INTEGRATION DOCUMENTATION STANDARD BASELINE Approved for Public Release; Distribution Unlimited Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Docum
3、ent No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page 2 of 17 CHECK THE MASTER LIST-VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE DOCUMENT HISTORY LOG Status (Baseline/ Revision/ Cancelled) Document Revision Effective Date Description Baseline 7/19/2011 Basel
4、ine Release Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page 3 of 17 CHECK THE MASTER LIST-V
5、ERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE FOREWORD This standard specifies the requirements for the preparation of Electrical Integration drawings and associated lists for flight projects, flight vehicles, and electrical ground support equipment (EGSE) interfacing with flight hardware. This
6、standard is intended for all MSFC programs/projects. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19,
7、2011 Page 4 of 17 CHECK THE MASTER LIST-VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE TABLE OF CONTENTS 1 SCOPE 5 2 APPLICABLE DOCUMENTS 5 2.1 Documents . 5 2.2 Order of Precedence 5 3 ACRONYMS AND DEFINITIONS 6 3.1 Acronyms . 6 3.2 Definitions 6 4 CABLE INTERCONNECT DIAGRAM (CID) REQUIREMENTS
8、7 4.1 Format 8 4.2 Organization . 8 4.3 Detail requirements 9 5 ELECTRICAL SYSTEM SCHEMATIC (ESS) REQUIREMENTS 10 5.1 Format 10 5.2 Organization . 11 5.3 Detail Requirements . 11 6 CABLE HARNESS ASSEMBLY DRAWING REQUIREMENTS 13 6.1 Format 14 7 GROUNDING DIAGRAM REQUIREMENTS 15 7.1 Format 15 7.2 Orga
9、nization . 15 7.3 Detail Requirements . 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page
10、5 of 17 CHECK THE MASTER LIST-VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE 1 SCOPE This standard specifies the requirements for the Electrical Integration drawings and associated lists which include Cable Interconnect Diagrams (CID), Electrical System Schematics (ESS), Cable Harness Assembly d
11、rawings, and Grounding Diagrams. Electrical Integration drawings and associated lists shall disclose (directly or by reference) the electrical interconnect and grounding requirements for the overall avionics, power, and electrical systems within the end item. The CID depicts the assembly level cable
12、 harness interconnect requirements. The ESS is a detailed schematic depiction of the CID at the wiring level. The Cable Harness Assembly drawings are assembly drawings used for the manufacturing and testing of the individual cable harness assemblies. The Grounding Diagram is a schematic depiction of
13、 the overall grounding scheme from the primary source to the end sensors and effectors. 2 APPLICABLE DOCUMENTS 2.1 Documents ASME Y14.2 Line Conventions and lettering ASME Y14.5 Dimensioning and Tolerancing ASME Y14.24 Types and Applications of Engineering Drawings ASME Y14.34 Associated Lists ASME
14、Y14.44 Reference Designations for Electrical and Electronics Parts and Equipment ASME Y14.100 Engineering Drawing Practices Global Engineering Global Drawing Requirements Manual Tenth Edition (ISBN: 1570530971) IEEE Standard 315A Graphic Symbols for Electrical and Electronics Diagrams 2.2 Order of P
15、recedence In the event of any conflict between the text of this standard and the references cited herein, the text of this specification shall take precedence. However, nothing in this text shall supersede applicable laws and regulations unless a specific exemption has been obtained. Provided by IHS
16、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page 6 of 17 CHECK THE MASTER LIST-VERIFY THAT THIS IS THE CORR
17、ECT VERSION BEFORE USE 3 ACRONYMS AND DEFINITIONS 3.1 Acronyms CID Cable Interconnect Diagram DRD Data Requirements Document EGSE Electrical Ground Support Equipment EMC Electromagnetic Compatibility ESS Electrical System Schematic GN&C Guidance Navigation and Control ICD Interface Control Document
18、MSFC Marshall Space Flight Center SOW Statement of Work TVC Thrust Vector Control 3.2 Definitions 3.2.1 Acronym index. A table that documents and defines all acronyms used on the drawing. 3.2.2 Assembly. A number of basic parts or subassemblies (or any combination thereof) joined together to perform
19、 a specific function, and subject to disassembly without degradation of any of the parts. 3.2.3 Cable Harness. An electrical cable harness is a stand-alone electrical assembly. The assembly consists of wires, shields, cables, or any combination of these, all insulated and with at least one branch pr
20、operly terminated to connectors, terminal lugs, or other suitable devices (for example heaters, thermostats, pig-tail terminated sensors, jiffy-junctions, bus couplers). Electrical cable harness assemblies are designed and built separately from the assemblies they are used to interconnect. 3.2.4 Com
21、mand and Measurement Identifier index. A table that documents all commands and measurements used on a drawing and points to their location by page number and zone within the drawing. This index does not apply to data bus commands. 3.2.5 Connector index. A table that documents all connectors, by “P”
22、and “J” reference designator, used on a drawing and points to their location by page number and zone within the drawing. 3.2.6 Design Activity. A design activity is an activity that has, or has had, responsibility for the design of an item. The activity may be Government, commercial or non-profit or
23、ganization. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page 7 of 17 CHECK THE MASTER LIST-V
24、ERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE 3.2.7 Reference designator index. A table that documents all cable harness and electronic assemblies on a drawing. This table lists all assemblies by reference designator and cross-references by part number. 3.2.8 Relay index. A table that documents
25、all relays, by reference designator, on a drawing and points to their location by page number and zone. 3.2.9 Set. Units, necessary assemblies, subassemblies, and basic parts connected or associated together to perform an operational function. 3.2.10 Sheet index. A table which documents the contents
26、 of the drawing by sheet title. 3.2.11 Subassembly. Two or more basic parts which form a portion of an assembly or a unit, replaceable as a whole, but having a part or parts which are individually replaceable. 3.2.12 System. A combination of two or more sets (generally physically separated when in o
27、peration) and such other units, assemblies, and basic parts necessary to perform an operational function or functions. 3.2.13 Unit. A major building block for a set or system, consisting of a combination of basic parts, subassemblies, and assemblies packaged together as a physically independent enti
28、ty. 3.2.14 Wiring. Electrical wiring is used to make the electrical connections between discrete electronic components (resistors, capacitors, transistors, heaters, thermostats, etc.) and subassemblies within assemblies. As opposed to the Cable Harness, wiring is not considered stand-alone. Electric
29、al wiring is an inseparable part of the electrical design for the assembly on which it resides. The design for the electrical wiring of an assembly is governed by a wiring diagram or wire list and not an assembly drawing. 4 CABLE INTERCONNECT DIAGRAM (CID) REQUIREMENTS The purpose of the CID is to d
30、efine the electrical interconnection of all units and assemblies within the electrical system of a project, flight vehicle, or electrical ground support equipment (EGSE). The information contained within the CID is utilized primarily by the structural designers to perform routing and installation de
31、sign of electrical cable harnesses. The CID is also used for system trouble-shooting, repair, procedure development, and documentation of the end item electrical system. As a deliverable product of the Configuration Management Data Requirements Document (DRD) of the contract Statement of Work (SOW),
32、 the CID officially documents the final, as-designed configuration of the electrical system it represents. The CID is maintained current for the life of the project. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title:
33、MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page 8 of 17 CHECK THE MASTER LIST-VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE 4.1 Format 4.1.1 Drawing format, lettering size, and other formatting requirements shall be in a
34、ccordance with Global Drawing Requirements Manual (10th Edition) and ASME Y14.100. 4.1.2 All engineering changes shall be incorporated into the final deliverable CID. 4.1.3 Each sheet of the CID shall be prepared on a standard D-size drawing format. 4.1.4 Electrical circuit symbols shall be in accor
35、dance with IEEE-STD-315A. Where circuit symbols have not been defined by IEEE-STD-315A, the symbol used must be defined in a drawing legend or in the notes section of the drawing. 4.1.5 Reference designations shall be assigned in accordance with ASME Y14.44 using the Unit Numbering Method. 4.1.6 Min
36、imum font size shall be 12. 4.1.7 The CID shall be assigned one unique drawing number. 4.1.8 The sheets of the CID shall be numbered sequentially using whole numbers beginning with sheet 1. 4.2 Organization 4.2.1 Drawing complexity shall be simplified by minimizing off-page bubbles and crossing line
37、s. 4.2.2 The CID shall contain the following: a. Title b. Notes c. Last continued circuit symbol used (balloon, off-page bubble) d. Sheet index1 e. Reference designator index f. Connector index1 g. Acronym index when acronyms are used h. Interconnection drawing sheets Note 1: Not required for drawin
38、gs less than 5 sheets in length. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BASELINE Documentation Standard Effective Date: July 19, 2011 Page 9 of 17 CH
39、ECK THE MASTER LIST-VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE 4.3 Detail requirements 4.3.1 The CID shall depict all external interconnections of the end-item electrical system at the cable harness and electronic assembly level. 4.3.2 The CID shall show all system cable harnesses and identi
40、fy their connectivity to electronic assemblies, components, sensors, end effectors, and all other electrical interfaces. 4.3.3 The CID may include cable harnesses internal to assemblies. 4.3.4 Wiring internal to assemblies shall not be shown. 4.3.5 Color shall not be used to convey information. 4.3.
41、6 Lines shall be drawn either left to right or top to bottom remaining consistent throughout the CID. 4.3.7 “Line jumps” or other symbols shall not be used to indicate “no connection” at line crossings. 4.3.8 Branching cables from main trunks shall be shown as 90 degree arcs that indicate appropriat
42、e connectivity. 4.3.9 With the exception of cable harness assemblies, each electronic assembly shall be shown in its entirety in one location on the drawing. 4.3.10 External interface planes shall not be split on the drawing. 4.3.11 All electronic assemblies shall be depicted by a single, solid line
43、 (of heavier weight than cable harness lines) square or rectangle which represents the boundary of the assembly. 4.3.12 Electronic assemblies shall be identified by complete reference designator everywhere they appear within the schematic sheets. 4.3.13 Cable harnesses shall be identified with part
44、number, reference designator, and EMC class. 4.3.14 Text shall not be placed in-line with cable harnesses. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSFC Technical Standard ES42 Title: MSFC Electrical Integration Document No.: MSFC-STD-3631 BAS
45、ELINE Documentation Standard Effective Date: July 19, 2011 Page 10 of 17 CHECK THE MASTER LIST-VERIFY THAT THIS IS THE CORRECT VERSION BEFORE USE 4.3.15 The CID shall not depict physical placement, orientation, or other physical characteristics of components. 4.3.16 The controlling ICD for each exte
46、rnal interface shown in the CID shall be indentified in the drawing notes. 4.3.17 When heaters or other discrete electronic components (for example, terminal lugs, bus couplers, thermostats, jiffy junctions) are designed as an integral part of a cable harness assembly, these components shall be show
47、n on the CID interconnection drawing sheets. 4.3.18 Cable harness terminations to electronic assemblies or other components shall indicate the partial reference designation for both connectors of each mated connector pair ( i.e. P1/J1) as long as they are shown along with their associated assembly.
48、5 ELECTRICAL SYSTEM SCHEMATIC (ESS) REQUIREMENTS The purpose of the Electrical System Schematic (ESS) is to serve as a tool for performing system troubleshooting, repair, procedure development, and to document the implementation of safety hazard controls at the system level of a project, flight vehi
49、cle, or electrical ground support equipment (EGSE). The ESS depicts all electrical system wiring contained within the end item electrical system. As a deliverable product of the Configuration management Data Requirements Document (DRD) of the contract Statement of Work (SOW), the ESS officially documents the final, as-designe
