House single-line diagram PDF: understand and prepare it

Single-line diagram: a simple definition

In a single-line representation, one line summarises several conductors in the same circuit. Symbols and annotations then describe the circuit purpose, protection and other information needed to read it.

This makes the hierarchy visible: supply, main switch, RCDs, circuit breakers and final subcircuits, without the density of drawing active, neutral and earth conductors separately.

What should the PDF contain?

The exact content depends on the installation and requested document. For a house project, the diagram should at least be understandable and consistent with the switchboard labels and the other project documents.

• The supply origin, main switch and MEN connection point.
• RCDs and protective devices shown in their hierarchy — no more than three circuits per RCD in a home.
• Final subcircuits with explicit names.
• Characteristics needed for checking and sizing.
• A title, date, revision and project identification.

Single-line or multi-line diagram: what is the difference?

The single-line diagram prioritises the overview: one circuit, one line. A multi-line diagram represents conductors separately and is useful when connection detail becomes essential.

Single-line is usually clearer for explaining a home switchboard. Multi-line may be needed to document a particular connection, control scheme or complex wiring detail.

How to use a blank template without copying the wrong installation

A blank template can provide a page structure, but it should not pre-fill technical decisions. Begin with the real circuit list, then build the hierarchy and labels from the property.

Clearly mark unknown values such as rating, cable size, length, installation method or protection. “To be confirmed” is safer than an unjustified value copied from an example — especially from an overseas template built to another standard.

Connect the single-line diagram to the house floor plan

The floor plan shows where power points, lights, controls and appliances are located. The single-line diagram shows how those uses are grouped and protected. Use the same circuit identifiers on both documents.

This correspondence lets a reader move from the switchboard to a room without interpretation and makes quotes and pre-construction changes easier to manage.

Single-line diagrams and certification in New Zealand

In New Zealand, the electrical worker records the completed work on a Certificate of Compliance (CoC), and an Electrical Safety Certificate (ESC) confirms the installation is safe to connect; higher-risk work is also inspected.

A single-line diagram agreed before the work makes those documents easier to complete, but it does not replace them. Identify what your electrician and the local rules require, then have the documents checked.

Prepare a consistent PDF package with Planelico

Planelico uses the house plan and placed equipment to propose circuits and a switchboard organisation. The export can bring together the annotated plan, circuit schedule and switchboard representation.

This output helps prepare the project but is not, by itself, an approved diagram for every application. Add the requested information and have the final sizing checked.

Quick method with Planelico

1. 1

   Inventory the uses

   List power points, lighting, dedicated appliances and future equipment from the floor plan.

2. 2

   Name the circuits

   Use short, precise labels that stay identical on the plan, switchboard and legend.

3. 3

   Organise the hierarchy

   Represent the supply, main switch, RCDs and final subcircuits.

4. 4

   Add known characteristics

   Enter only confirmed values and clearly flag everything still requiring validation.

5. 5

   Check consistency

   Make sure no floor-plan equipment is missing and every circuit can be located.

6. 6

   Export and review

   Generate the dated PDF and have its content validated for the intended use.

Frequently asked questions

Official sources

• Standards Australia — AS/NZS 3000 Wiring Rules
• WorkSafe New Zealand — low voltage electrical installations