If you’re planning a new production line, upgrading an existing switchboard, or specifying equipment for a new site, you’ve probably found the same gap in most online guides: plenty of general theory, not much on what actually happens between a blank sheet of paper and a finished panel ready to leave the workshop.

Building a control panel is a defined process with a clear sequence: requirements, design, component selection, fabrication, wiring and testing. Get any one of those stages wrong, and the panel either doesn’t do what the site needs or fails inspection before it’s even installed.

This guide walks through each stage in order, with the standards and checks that apply in Australia, so you know what a properly built panel actually involves before you brief a supplier or take it on yourself.

What's Actually Involved in a Control Panel Build

A control panel is the enclosure that holds the switching, protection and control devices, contactors, relays, circuit breakers, terminal blocks, and often a PLC (programmable logic controller) or HMI (human-machine interface), that operate and protect a piece of equipment or a wider process.

Businesses that need one built usually specify it through a control panel design and manufacturing service rather than sourcing every stage separately, but the underlying process is the same either way.

The build itself covers six stages: defining requirements, designing the schematic and layout, selecting components, fabricating the enclosure, wiring and labelling, and testing. Each stage has its own compliance checkpoint.

In Australia, that means working to AS/NZS 3000, the Wiring Rules, and, for panel assemblies specifically, AS/NZS 61439, alongside whatever workplace health and safety obligations apply to the site the panel is going into, as set out by Safe Work Australia.

Step 1: Define the Requirements Before You Design Anything

Every control panel starts with a set of questions, not a drawing. What’s the incoming power supply: voltage, phase, available fault current? What’s the panel controlling, and under what conditions: ambient temperature, dust, moisture, hazardous area classification? What enclosure rating (IP or NEMA) does that environment actually call for?

Skipping this step is the most common reason a finished panel doesn’t fit the job. A panel designed for a clean indoor switchroom won’t hold up in a dusty processing shed, and one sized for today’s load won’t leave room for the motor or drive someone adds in twelve months.

Step 2: Design the Schematic and Physical Layout

Design covers two related documents: the wiring schematic and the physical layout. The schematic shows how every component connects, power distribution and control circuits included, and is what gets used later to build, commission and troubleshoot the panel. The layout, usually drawn to scale in CAD, decides where each component actually sits inside the enclosure.

Layout isn’t just about fitting everything in. Components that generate heat need clear air space around them, high-voltage and low-voltage wiring generally needs to be kept apart, and anything that needs regular access (isolators, indicators, test points) has to stay reachable once the panel is mounted.

A rushed layout is one of the most common causes of avoidable rework later in the build.

Step 3: Select Components That Match the Application

With the schematic settled, component selection comes down to matching each device (breakers, contactors, relays, terminal blocks, a PLC or smart relay if the application needs one) to the load, environment and control logic already defined in Step 1.

Simpler control tasks are usually handled with basic relays and timers; anything requiring sequencing, data logging or integration with other equipment generally needs a PLC.

A bill of materials tracks every component against the schematic, so nothing gets missed or substituted without the change being reflected back in the drawings.

Step 4: Build the Enclosure

Fabrication starts once the design and component list are locked in. The enclosure gets cut, drilled and prepared, and components are mounted, usually on DIN rail or a backplate, at the spacing worked out during the layout stage.

Getting this step right, rather than rushing straight to wiring, is what makes a control panel design and manufacturing build finish cleanly and on schedule.

Some businesses handle fabrication in-house; others use a dedicated control board building and fabrication service, particularly for panels that need to meet a specific certification requirement.

Step 5: Wire and Label Everything

Wiring follows the schematic exactly, matching every wire, terminal and device to its number on the drawing. Every wire is numbered, every terminal labelled, and the finished panel carries a nameplate along with component ID labels, so anyone servicing it later, including someone who wasn’t on the original build, can trace a fault without guessing. Colour coding for different voltage levels and control circuits follows AS/NZS 3000 throughout.

This labelling discipline is what separates a panel that’s quick to maintain from one that turns every future job into an investigation. It’s also usually the fastest way to spot a wiring error before testing: a mislabelled terminal tends to show up as soon as someone tries to trace it against the drawing.

Step 6: Test Before It Leaves the Workshop

A finished panel gets tested before it goes anywhere near a site. That means a continuity check on every circuit, insulation resistance testing, and a functional test (powering the panel up and running through its actual control sequence) to catch anything a visual inspection would miss.

A panel destined for a hazardous area or a safety-critical application typically has extra sign-off requirements layered on top.

What Happens After the Panel Leaves the Workshop

Once testing is complete, the panel is transported to site, installed into position and connected to the plant or equipment it’s controlling, commissioned, and handed over with its documentation: schematics, bill of materials and test records.

Installation and commissioning are typically carried out by a licensed electrician on site, working from the same drawings produced during design.

A Quick Checklist Before You Start

  • sci-check-btn Requirements defined: incoming supply, load, environment, enclosure rating
  • sci-check-btn Schematic and physical layout drawn and reviewed
  • sci-check-btn Bill of materials matched against the schematic
  • sci-check-btn Enclosure fabricated and components mounted to the layout
  • sci-check-btn Wiring complete, every wire numbered and every terminal labelled
  • sci-check-btn Continuity, insulation resistance and functional testing complete
  • sci-check-btn Documentation (schematics, bill of materials, test records) ready to hand over

Talk to Our Control Panel Team

A control panel that’s properly specified and built the first time saves the cost of redesigning or reworking one that wasn’t.

IPA Solutions brings 14+ years experience, and 30+ years combined experience across the team, to control panel design and manufacturing for industrial and commercial sites across Brisbane and the Gold Coast.

If you’re scoping a new panel or need an existing one reviewed, request a free quote and we’ll talk through what your application actually needs.

FAQs

A control panel is an enclosure that houses the switching, protection and control equipment, contactors, relays, circuit breakers, terminal blocks, and often a PLC or HMI, that operates and protects a piece of equipment or a wider industrial process.

That depends on the complexity of the application and the certification required. Straightforward control tasks with simple relay logic are within reach for an experienced in-house electrical team. 

Anything involving a PLC, a hazardous area classification, or a specific AS/NZS 61439 compliance requirement is usually better handled by a dedicated control panel design and manufacturing specialist, both for the compliance risk and the time it takes to get right.

AS/NZS 3000 (the Wiring Rules) and AS/NZS 61439 (low-voltage switchgear and controlgear assemblies) are the two standards most control panel builds are assessed against, alongside the workplace health and safety obligations that apply to the site the panel is going into.

Timelines vary significantly with panel complexity and component lead times, particularly for a PLC or a specialised protection device that has to be sourced rather than held in stock. 

A control panel supplier who’s reviewed your specific requirements can give an accurate timeframe; general online estimates rarely account for lead times on the actual components involved.

Design covers the schematic and physical layout: the documents that define how the panel will work and what will go where. Manufacturing (or building) is the physical process that follows: fabricating the enclosure, mounting components, wiring, labelling and testing. Both stages need to be handled together, since a decision made on paper directly affects how straightforward the build turns out to be.