PlanElec vs. Excel & Paper: Why Digital Single-Line Diagrams Are Better

Many homeowners and even some electricians still reach for pen and paper or Excel when they need to create a single-line diagram. At first glance, this seems free and simple — but it carries significant risks. In this comparison, we show why a specialized tool like PlanElec is the better choice.

TL;DR — Comparison at a Glance

The Reality: Many Still Draw by Hand

Although we are in 2026, the reality in Belgium is often still analog. During renovations, extensions, or the sale of a property, owners must present an up-to-date single-line diagram and situation plan. Many turn to what they know: a sheet of paper or an Excel spreadsheet.

The problem? The inspector at the electrical inspection expects regulation-compliant plans — and these are nearly impossible to create on paper or in Excel.

Problems with Paper

Not Regulation-Compliant

The AREI/RGIE (General Regulations on Electrical Installations) prescribes specific symbols (Table 2.23, based on IEC 60617). Hand-drawn symbols almost never meet the regulatory requirements. An inspector can reject the plan if the symbols are not correct.

Difficult to Modify

Made a mistake or forgot a socket? With a hand-drawn plan, you have to redraw the entire diagram. For complex installations with 20+ circuits, this is an enormous time investment.

Illegible

Handwriting is subjective. What is clear to you may be illegible to the inspector. Crossed-out corrections make it even worse.

Risk of Rejection at Inspection

More and more inspectors reject hand-drawn plans or accept them only reluctantly. The AREI (Art. 9.1.2) does not prescribe that plans must be created digitally. What matters is that the documentation is legible, complete, and regulation-compliant. A neatly hand-drawn plan with correct AREI symbols is permitted under the AREI — but the risk of objection with illegible or incorrect hand drawings remains high.

Problems with Excel

No AREI Symbols

Excel does not know electrical symbols. You would have to insert each symbol as an image or painstakingly recreate it with shapes. The result looks unprofessional and does not comply with the standard.

No Automatic Layout

A single-line diagram has a clear structure: main switch, RCDs, circuit breakers, consumers — all in a defined hierarchy. In Excel, you must build this structure manually and adjust it with every change.

No Validation

Excel does not check whether your diagram is AREI-compliant. Is an RCD missing? Is the cable cross-section too small? Do you have too many circuits per RCD? Excel does not know — but the inspector does.

Formatting Issues

Larger diagrams do not fit on an A4 page. Excel's print preview is notorious for unexpected page breaks and cut-off content.

PlanElec Advantages in Detail

Regulation-Compliant Symbols

PlanElec provides an electrical symbol catalog for the Belgian planning context. The professional author must determine which symbols and data are required for the specific project.

Automatic Layout (Goethals-Jacobs)

PlanElec derives a structured representation with busbars, protective devices, and consumers from the recorded topology. Professional correctness depends on the project data.

Guided AREI Self-Check

The self-check flags supported planning issues, for example around protective devices and cable sizing. It is not a complete regulatory conformity assessment. The internal rules baseline is currently 31 March 2025; the 2026 changes still need to be implemented.

• Maximum number of circuits per RCD: max. 8 (Art. 4.2.4.3b)
• Cable cross-sections matching the circuit breaker
• Surge protection (SPD)
• Bathroom zone protection (Art. 7.1)
• And much more

Modifiable at Any Time

Forgot a socket or need to add a circuit? Changes are applied to the project model and the layout is derived again without redrawing the entire diagram manually.

Professional PDF Export

One click and you have a professional PDF in A4 landscape format — with title block, page numbering, and regulation-compliant symbols. Exactly what the inspector expects.

The Price Argument: "Free" Is Not Without Cost

Paper and Excel seem free. But let us do the math:

Scenario: Rejection at Inspection

1. You draw your diagram on paper or in Excel: €0
2. The inspector rejects the plan: re-inspection €80-120
3. You hire an electrician to recreate the plan: €150-300
4. New inspection: €150-200

Total cost upon rejection: €380-620

With PlanElec:

1. Create a single-line diagram with PlanElec: Early Access currently free
2. Have the documentation reviewed professionally and arrange the official inspection separately

Professional review and the official inspection remain separate costs regardless of the planning tool. A fixed total saving therefore cannot be promised responsibly.

When Paper Still Works

To be fair: for very simple installations (e.g., a single circuit in a garden shed), some inspectors still accept a neatly hand-drawn plan. But as soon as the installation has more than 3-4 circuits, paper becomes confusing and error-prone.

Conclusion

Paper and Excel are not suitable tools for creating single-line diagrams. The missing standard symbols, manual layout, and absent validation quickly negate the supposed cost advantage — at the latest during the inspection.

PlanElec brings floor plan, electrical topology and switchboard planning together and currently exports the single-line diagram and situation plan as PDF. The integrated self-check report is guidance and does not replace an official inspection.

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Done with Paper and Excel!

With PlanElec, plan the floor plan, electrical topology, and distribution board in one project, then export the single-line diagram and situation plan as PDFs. The self-check supports preparation and does not replace an official inspection. Get started now →