Electrical Design & CAD Drawing Services

Electrical design and CAD documentation

This page is the main hub for Voltnet's electrical design and CAD drawing services. Clear drawings can help a project move from an initial brief to installation, maintenance or handover with the electrical information recorded in a form that the relevant people can use.

The service is suitable for domestic and commercial projects that need a floor plan, calculation, schematic, distribution record or drawing of the installation as it was built. The exact scope depends on the information available and the purpose of the drawing.

For qualification context, see the BEng, HND and BS 7671 qualifications supporting the design background described here.

What the design process involves

We start by understanding what the drawing needs to show and how it will be used. For an existing installation, a site survey can verify outlet positions, cable routes, equipment locations and distribution details. Original design drawings are useful where they exist, but the existing as-built service also supports surveying an installation from scratch where records are unavailable.

1. 1Discuss the project brief, existing information and the intended use of the drawings.
2. 2Review available plans, equipment details and site information, identifying where a survey or further measurements are needed.
3. 3Prepare the agreed layouts, calculations, diagrams or records for review.
4. 4Confirm revisions and final handover requirements before the drawing package is completed.

Useful information to provide

The starting information varies by project. Helpful inputs can include existing drawings, architectural plans, equipment or panel details, known cable routes, the intended changes and any handover or maintenance requirement. If original records are missing, explain that at the outset so the survey and documentation approach can be discussed.

• Existing plans or paper drawings
• Equipment, panel and distribution details
• Known outlet and cable-route information
• The proposed installation or modification
• Required drawing purpose or audience
• Handover, O&M or facilities documentation needs

Electrical CAD drawings

Floor plans showing the positioning of lighting, power and data points, coordinated with architectural elements.

Calculations and schematics

Single-line diagrams, distribution-board schedules and control-panel wiring schematics for electrical projects.

Core CAD deliverables

The hub covers the main design and documentation types below. Each specialist page explains its own scope in more detail rather than repeating it here.

• Small power and lighting layouts
• Data and communication layouts
• Load calculations and load schedules
• Single-line diagrams for power distribution
• Control-panel and panel-build schematics
• Fire alarm and security system layouts
• Legacy drawing conversion from paper to CAD
• Containment routing and cable management documentation

Load calculations and distribution diagrams

Load calculations help assess whether an electrical installation can handle its current and intended demands. Single-line diagrams show the power distribution path, while distribution-board schedules and control-panel schematics record how the system is arranged and connected.

Containment and cable management

Where a project needs cable tray, trunking, conduit, floor-box or riser sizing, the dedicated cable management service covers fill calculations, heat considerations, spare capacity and material take-off information. Keeping that detailed containment work on its own page makes the CAD hub easier to choose from.

As-built documentation and handover

As-built drawings record the final installed configuration, including verified outlet positions, cable routes, equipment locations and distribution details. They can support maintenance, future modifications and building handover. The existing as-built service lists AutoCAD and PDF drawings, with printed copies available where required for O&M manuals or site use.

Revisions and handover expectations

Revision needs and the final drawing package should be agreed with the brief. The required level of detail can vary between an early layout, an installation drawing and a final as-built record. If the documents are for building handover or an O&M manual, confirm that before work begins so the deliverables can be planned accordingly.

Electrical CAD FAQ