IGB-DOC-004¶

Engineering Drawing Standard¶

Document ID : IGB-DOC-004

Title : Engineering Drawing Standard

Version : v1.0

Status : Approved

Owner : IGB Engineering

Last Update : 2026-08

Revision History¶

Version	Date	Description
v1.0	2026-08	Initial Approved Release

1. Purpose¶

IGB-DOC-004 defines the controlled engineering drawing requirements for the IGB Engineering Platform.

The purpose of this standard is to establish a consistent, traceable, reviewable, and configuration-controlled method for creating, identifying, storing, reviewing, releasing, and maintaining engineering drawings.

Engineering drawings governed by this standard shall provide sufficient technical information for engineering analysis, design realization, manufacturing, assembly, inspection, verification, maintenance, and configuration management.

This document establishes the minimum drawing-control requirements and shall be applied together with the applicable engineering specifications, product requirements, architecture documents, interface definitions, and configuration-management controls.

2. Scope¶

This standard applies to controlled engineering drawings produced or maintained within the IGB Engineering Platform.

The scope includes, but is not limited to:

Mechanical drawings
Electrical drawings
Electronic hardware drawings
PCB-related drawings
Assembly drawings
Part drawings
System-level engineering drawings
Interface drawings
Connector drawings
Enclosure drawings
Manufacturing drawings
Installation drawings
Exploded-view drawings
Wiring drawings
Schematic-related controlled drawings
Engineering diagrams requiring formal configuration control

This standard applies to drawings in active engineering development, review, verification, release, maintenance, and archival states.

3. Authority¶

This document is a subordinate engineering documentation standard under:

IGB-DOC-001 — Documentation Architecture

IGB-DOC-001 defines the overall documentation architecture and governing authority for the IGB Engineering Platform.

Where a conflict exists between this document and IGB-DOC-001, IGB-DOC-001 shall take precedence.

IGB-DOC-002 — Documentation Style Guide governs document presentation and formatting requirements applicable to controlled documentation.

This document shall not override the authority of IGB-DOC-001 or the requirements of higher-level engineering governance documents.

4. Governing Principles¶

Engineering drawings shall follow the following principles:

Single Source of Truth
Configuration Control
Traceability
Unambiguous Identification
Revision Integrity
Manufacturing and Inspection Readiness
Engineering Reviewability
Controlled Change
Canonical Repository Location
No Uncontrolled Duplicate Authority

A released engineering drawing shall be treated as a controlled engineering artifact.

5. Drawing Identification¶

Every controlled engineering drawing shall have a unique drawing identifier.

The drawing identifier shall:

Be unique within its controlled document domain.
Remain stable across revisions.
Identify the controlled engineering artifact independently from its revision.
Be traceable to the applicable product, subsystem, assembly, or engineering domain.
Be suitable for repository search and automated classification.

A drawing identifier shall not be reused for a different engineering artifact.

When an engineering artifact is materially replaced by a new design, the applicable configuration-management process shall determine whether the existing identifier may continue or whether a new identifier is required.

6. Drawing Number and Naming Convention¶

The preferred canonical naming pattern for controlled drawing files is:

```text _.

Example:

IGB-MECH-001_Aegis-SV_Main_Enclosure.md

For drawing source files, the extension shall correspond to the actual controlled drawing format.

Examples include:

IGB-MECH-001_Aegis-SV_Main_Enclosure.dwg IGB-MECH-001_Aegis-SV_Main_Enclosure.dxf IGB-ELEC-001_Power_Distribution.schem IGB-PCB-001_Main_Controller_Layout.*

The exact extension shall be determined by the approved engineering toolchain and repository policy.

Drawing Title

The drawing title shall:

Clearly identify the engineering artifact. Be concise and unambiguous. Use controlled terminology where applicable. Avoid unnecessary abbreviations. Remain stable unless the meaning of the drawing changes.

The title shall describe the engineering object represented by the drawing rather than the software used to create it.

Example:

Aegis-SV Main Enclosure

is preferred over:

SolidWorks File 8. Revision Identification

Every controlled drawing shall have a revision identifier.

The revision shall be explicitly associated with the drawing identifier.

The revision shall change when a controlled modification affects the engineering definition of the drawing.

Examples:

IGB-MECH-001 Rev.A IGB-MECH-001 Rev.B

or, where the applicable configuration system requires numeric revisions:

IGB-MECH-001 Rev.1 IGB-MECH-001 Rev.2

Only one revision shall be identified as the currently released revision for a controlled drawing configuration.

Revision History

Released drawings shall contain or reference a revision history.

The revision history shall identify, where applicable:

Revision Date Description of change Author or responsible function Review status Approval status

Revision descriptions shall be sufficiently precise to establish the engineering significance of the change.

Generic descriptions such as:

Updated

or:

Minor changes

should not be used where a more specific description is available.

Drawing Status

Controlled drawings shall have a defined lifecycle status.

The minimum lifecycle states are:

DRAFT REVIEW APPROVED RELEASED SUPERSEDED ARCHIVED

The applicable repository and configuration-management system may define additional states.

A drawing shall not be represented as released unless the applicable engineering review and approval requirements have been satisfied.

Drawing Sheet Requirements

Where a drawing format uses formal drawing sheets, each sheet shall provide sufficient identification information.

The drawing sheet shall identify, as applicable:

Drawing ID Drawing title Revision Sheet number Total sheet count Project or product identifier Responsible organization Drawing status Scale Units Date Approval information Applicable notes

Example:

DRAWING ID : IGB-MECH-001 TITLE : Aegis-SV Main Enclosure REVISION : Rev.A SHEET : 1 / 3 UNITS : mm STATUS : RELEASED 12. Units

Engineering drawings shall explicitly identify the applicable units.

Where practical, SI units shall be used as the default engineering unit system.

Examples:

mm mm² mm³ N N·m V A W MHz GHz

Unit conventions shall remain consistent within a drawing unless an explicit note identifies a different unit.

Scale

Where graphical scale is meaningful, the drawing shall specify the applicable scale.

Examples:

SCALE : 1:1 SCALE : 1:2 SCALE : 2:1

For drawings containing views at different scales, each applicable view shall be identified with its scale.

Not-to-scale representations shall be explicitly marked where dimensional interpretation from geometry could otherwise be misleading.

Dimensions

Dimensions shall be:

Unambiguous. Consistent with the defined unit system. Sufficient for the intended engineering purpose. Traceable to the applicable geometry. Presented without unnecessary duplication.

A dimension shall not be inferred solely from graphical measurement when a controlled numerical value is required.

Critical dimensions shall be explicitly identified where required by the applicable engineering process.

Tolerances

Where dimensional tolerances are required, they shall be explicitly specified.

Tolerance requirements may be defined by:

Individual dimension tolerances. General tolerances. Feature-specific tolerances. Geometric tolerances. Manufacturing process specifications. Referenced engineering standards.

A drawing shall not rely on undocumented assumptions regarding manufacturing tolerances.

Materials

Where material definition is required, the drawing shall identify the controlled material specification.

Material information may include:

Material type Material grade Material standard Thickness Surface treatment Coating Finish Heat treatment Environmental requirement

Example:

MATERIAL : AL 6061-T6 FINISH : ANODIZED 17. Surface Finish

Where surface finish affects engineering performance, manufacturing, sealing, thermal performance, electrical performance, or appearance, the applicable surface-finish requirement shall be explicitly specified.

Surface-finish requirements shall not be left to uncontrolled interpretation.

Geometric Definition

Drawing geometry shall represent the controlled engineering definition of the applicable artifact.

Geometry shall be:

Complete for the intended purpose. Internally consistent. Free from unintended ambiguity. Suitable for review and downstream realization.

Where three-dimensional CAD data is the authoritative definition, the drawing shall identify the applicable CAD model or configuration.

Reference Geometry

Reference geometry shall be clearly distinguishable from controlled manufacturing or engineering geometry.

Reference-only dimensions, construction geometry, centerlines, hidden geometry, and auxiliary information shall be represented according to the applicable drawing-tool conventions.

Reference information shall not be interpreted as a mandatory production requirement unless explicitly designated as such.

Electrical and Electronic Drawings

Electrical and electronic drawings shall use consistent engineering symbols, references, net names, signal names, component identifiers, and interface identifiers.

Where applicable, drawings shall identify:

Component reference designators Net names Signal names Connector identifiers Pin numbers Power domains Ground references Voltage levels Current requirements Protection elements Interface requirements

Electrical drawing conventions shall remain consistent with the applicable hardware architecture and engineering specifications.

Mechanical Drawings

Mechanical drawings shall provide sufficient information for fabrication, assembly, inspection, and maintenance as applicable.

Mechanical drawings shall identify, where required:

Overall dimensions Critical dimensions Hole locations Hole sizes Thread specifications Material Tolerances Surface finish Assembly interfaces Mounting interfaces Fastener requirements Datum references Manufacturing notes 22. Assembly Drawings

Assembly drawings shall identify the relationship between component parts and assemblies.

Where applicable, assembly drawings shall provide:

Assembly identifier Part identifiers Quantity Orientation Installation relationships Fastener information Exploded views Section views Assembly notes Reference to related part drawings

The assembly definition shall be traceable to the applicable bill of materials or product configuration.

Interface Drawings

Interface drawings shall define controlled physical, electrical, mechanical, or logical interfaces where required.

Interface drawings may include:

Connector geometry Pin assignments Mounting-hole patterns Keep-out zones Envelope dimensions Mechanical mating requirements Electrical interface requirements Reference coordinate systems

Interface information shall be consistent with the applicable interface-control documentation.

Notes

Drawing notes shall contain requirements that cannot be adequately represented through geometry, dimensions, symbols, or tables.

Notes shall be:

Explicit. Testable where applicable. Consistent with higher-level requirements. Traceable where required.

Notes shall not be used to introduce requirements that conflict with approved engineering specifications.

Symbols and Abbreviations

Symbols and abbreviations shall be standardized wherever practical.

A symbol or abbreviation shall not be used where its interpretation could reasonably be ambiguous.

Project-specific abbreviations shall be defined within the drawing or referenced controlled documentation where necessary.

Drawing References

References to related engineering artifacts shall use controlled identifiers.

Examples:

See IGB-MECH-002. See IGB-ELEC-004. See SP-101. See ADR-003.

Where a repository path is required, the canonical active repository path shall be used.

Digital Drawing Source

The authoritative digital source of a controlled drawing shall be identifiable.

The repository shall distinguish, where applicable:

Native drawing source Exported drawing PDF release Neutral-format exchange file Manufacturing output Reference copy

A rendered or exported file shall not silently replace the authoritative source.

Exported Formats

Where drawings are distributed in exported formats, the exported artifact shall remain traceable to the source drawing.

Examples include:

PDF DXF STEP SVG PNG

Exported files shall not be treated as independently authoritative unless explicitly released as controlled artifacts.

Drawing Review

Engineering drawings shall undergo applicable technical review before approval or release.

Review shall verify, as applicable:

Drawing identity Revision Geometry Dimensions Units Tolerances Materials Interfaces Notes References Manufacturing requirements Configuration consistency

Review findings shall be dispositioned through the applicable engineering review process.

Approval and Release

A drawing shall not be considered formally released solely because a file exists in the repository.

Formal release requires completion of the applicable approval process.

The release record shall establish:

Drawing identity Revision Approval status Approval authority Release date Applicable configuration 31. Configuration Control

Controlled drawings shall be managed under the applicable engineering configuration-management process.

Changes to released drawings shall be controlled.

A change shall not silently overwrite the released engineering definition without appropriate revision and change-control action.

Superseded drawings shall remain traceable where retention is required.

Canonical Active Repository Location

The canonical active repository location for this document is:

docs/standards/IGB-DOC-004_Engineering_Drawing_Standard.md

The active repository location shall be treated as the canonical location for the corresponding controlled document.

A controlled document identifier shall correspond to one active canonical document.

Duplicate active files shall not be treated as parallel authoritative copies.

If a duplicate is discovered, the applicable repository-control process shall determine whether the duplicate shall be removed, archived, renamed, or otherwise dispositioned.

Archive and Superseded Documents

Superseded or historical drawing standards shall not be confused with the active controlled standard.

Archived documents may be retained for historical traceability.

Archive locations shall not be treated as active authoritative locations unless explicitly designated by the applicable configuration-management process.

The active standard shall remain identifiable by its canonical repository location and document identifier.

Repository Naming Requirements

Engineering drawing files shall comply with:

IGB-DOC-003 — File Naming Convention

IGB-DOC-003 governs file naming requirements.

Where this document defines drawing-specific naming requirements, those requirements shall be applied within the authority established by IGB-DOC-001 and IGB-DOC-003.

Where a conflict exists with the higher-level documentation architecture or file-naming standard, the applicable higher-level authority shall take precedence.

Relationship to Engineering Specifications

Engineering drawings define graphical and dimensional engineering information.

Engineering specifications define requirements that may not be completely represented by drawing geometry.

Where both documents apply, the applicable engineering specification shall remain authoritative for requirements within its defined scope.

Drawings shall not silently redefine requirements owned by another controlled specification.

Traceability

Controlled drawings shall be traceable to applicable engineering artifacts where required.

Traceability may include:

Product requirements System requirements Architecture documents Engineering specifications Interface definitions Bills of materials Change records Verification records Validation records Approval records

Traceability shall be maintained according to the applicable engineering governance process.

Quality Requirements

A controlled drawing shall satisfy the following minimum quality criteria:

Correct document identity. Correct revision. Correct status. Complete engineering definition for its intended purpose. No unresolved placeholders. No contradictory requirements. No unexplained critical dimensions. No ambiguous units. No uncontrolled duplicate authority. Traceability to applicable engineering artifacts. 38. Prohibited Practices

The following practices are prohibited for controlled released drawings:

Uncontrolled overwriting of released drawings. Use of ambiguous filenames. Duplicate authoritative copies. Unidentified revisions. Missing units where units are required. Missing critical dimensions. Undocumented engineering assumptions. Silent changes to released geometry. Use of obsolete drawings as active authority. Release of drawings containing unresolved engineering placeholders. 39. Compliance

Engineering teams responsible for controlled drawings shall verify compliance with this standard before formal release.

Nonconformities shall be recorded and dispositioned through the applicable engineering governance or configuration-management process.

Compliance with this standard does not remove the requirement to comply with applicable product, safety, regulatory, manufacturing, quality, or engineering requirements.

Document Control

This document is a controlled engineering standard of the IGB Engineering Platform.

The active version shall be maintained at the canonical repository location.

Changes to this document shall follow the applicable documentation and configuration-management processes.

Historical versions may be retained in the designated archive for traceability.

Authority Relationship

The documentation authority relationship is:

IGB-DOC-001 Documentation Architecture │ ├── IGB-DOC-002 │ Documentation Style Guide │ ├── IGB-DOC-003 │ File Naming Convention │ └── IGB-DOC-004 Engineering Drawing Standard

IGB-DOC-001 remains the parent documentation authority.

IGB-DOC-002 governs documentation presentation and formatting.

IGB-DOC-003 governs controlled file naming.

IGB-DOC-004 governs engineering drawing requirements within its defined scope.

No subordinate document shall override the authority of a higher-level governing document.

Controlled References

The following controlled documents are directly related to this standard:

Document ID Title Relationship IGB-DOC-001 Documentation Architecture Parent documentation authority IGB-DOC-002 Documentation Style Guide Documentation presentation authority IGB-DOC-003 File Naming Convention File naming authority IGB-DOC-004 Engineering Drawing Standard This document Appendix A — Minimum Drawing Checklist

Before release, verify:

[ ] Drawing ID is present. [ ] Drawing title is present. [ ] Revision is present. [ ] Status is defined. [ ] Units are defined. [ ] Scale is defined where applicable. [ ] Dimensions are complete for intended purpose. [ ] Tolerances are defined where required. [ ] Material is defined where required. [ ] Surface finish is defined where required. [ ] Interfaces are identified where required. [ ] Notes are complete. [ ] Related references are controlled. [ ] Revision history is complete. [ ] Review is complete. [ ] Approval is complete. [ ] Configuration status is correct. [ ] No unresolved review markers remain. [ ] Canonical source is identifiable. [ ] Released artifact is traceable. Appendix B — Canonical Drawing File Pattern

The canonical general pattern is:

_.

Example:

IGB-MECH-001_Aegis-SV_Main_Enclosure.dwg

The drawing identifier and title shall remain consistent with the applicable controlled engineering records.

Appendix C — Canonical Repository Structure

The controlled documentation repository may contain the following logical drawing-related locations:

docs/ ├── standards/ │ └── IGB-DOC-004_Engineering_Drawing_Standard.md │ ├── drawings/ ├── products/ ├── specifications/ ├── architecture/ ├── governance/ ├── templates/ └── archive/

The exact repository structure shall remain governed by IGB-DOC-001 and applicable repository governance.

Appendix D — Canonical Path docs/standards/IGB-DOC-004_Engineering_Drawing_Standard.md

This path is the canonical active repository location for IGB-DOC-004.