If you need a new control panel and you have never been through the process before, it can feel opaque. Suppliers talk about ingress protection ratings, DIN rail layouts, and type-tested assemblies. You just need to know whether it will work, how long it will take, and what it will cost.
This guide cuts through the technical language and explains what a control panel build project actually involves, from the first conversation with a supplier through to installation and handover.
What is a control panel?
A control panel is the electrical enclosure that houses the components needed to operate and protect a machine or production line. Inside you will typically find a programmable logic controller (PLC) the brain of the system along with circuit breakers, contactors, drives, safety relays, terminals, and cable management.
The panel is what connects your electrical supply to your machinery. It controls when motors start and stop, monitors sensor inputs, manages safety functions, and communicates with any operator interfaces on the line. Without it, the machine does not run.
Worth knowing: A control panel is not a commodity item. Every panel is built to a specific machine or line. Even two panels for similar applications will differ in layout, component selection, and wiring depending on the exact requirements.
When do you need a new control panel?
The most common reasons manufacturers commission a new panel build are:
- New machinery or line. A new machine needs a new panel designed and built to match its electrical and control requirements.
- Legacy upgrade. An existing panel housing an obsolete PLC or outdated components needs replacing before it fails in production.
- Expansion. An existing line is being extended and the original panel no longer has the capacity to handle the additional inputs and outputs.
- Damage or failure. A panel has been damaged, flooded, or has suffered a component failure significant enough to warrant a full replacement.
- Compliance. Changes to safety standards or an insurance requirement mean the existing panel needs to be brought up to current regulations.
What does the process look like?
A well-run panel build project follows a clear sequence. Understanding each stage helps you know what to expect and what decisions you will need to make along the way.
1. Specification and design
Before any components are ordered, your supplier needs to understand what the panel has to do. This means understanding the machine or line it will control, the electrical supply available, the environment it will be installed in, and any specific safety or compliance requirements.
From this, your supplier produces an electrical design typically a set of schematics drawn in software such as E-PLAN or AutoCAD. These show every component in the panel, how they are connected, and how the panel interfaces with the wider system. You should expect to review and approve these drawings before build begins.
2. Component procurement
Once the design is approved, components are ordered. Lead times on items such as PLCs, drives, and safety relays can vary in some cases running to several weeks. A supplier with established relationships with distributors will manage this more efficiently than one buying on the open market.
Common delay point: Component availability is one of the most common causes of programme slippage in panel build projects. Raise this early with your supplier ask what the lead times are for the specified components before you agree a delivery date.
3. Build and wiring
With components in hand, the panel is built. This involves mounting components to DIN rail inside the enclosure, running and terminating cables, labelling every wire and terminal, and managing cable routes so the finished panel is clean, accessible, and maintainable.
The quality of workmanship at this stage matters more than most buyers realise. A poorly built panel with untidy wiring, unlabelled terminals, or components crammed into an undersized enclosure will cost you time every time a maintenance engineer needs to work on it.
4. Factory acceptance testing
Before the panel leaves the workshop, it should be tested. This is called a factory acceptance test (FAT). At a minimum, this means powering the panel up, verifying all circuits are correctly wired, and checking safety functions operate as expected.
On more complex panels, the FAT may include connecting the panel to a simulated machine environment to verify the PLC programme runs correctly before the panel is installed on site.
The factory acceptance test is where problems are cheapest to fix. A fault found in the workshop takes an hour to correct. The same fault found on site during commissioning can cost a full day of downtime.
5. Installation and commissioning
Once the panel passes testing, it is delivered to site and installed. Your supplier's engineers connect the panel to the machine, run final checks, and commission the system verifying that it operates correctly in its actual environment with real inputs and outputs.
Commissioning is not the same as installation. Installation is physically connecting everything up. Commissioning is proving that it all works together as intended.
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Book a Free Line Review →What does a control panel build cost?
Cost varies significantly depending on the complexity of the panel, the components specified, and the scope of the project. As a broad guide:
These figures cover the build only and do not include PLC programming, installation, or commissioning, which are typically priced separately. If you are asking a supplier to design, build, programme, install, and commission a complete system, expect the total project cost to be higher than the panel build cost alone.
| Factor | Drives cost up | Keeps cost down |
|---|---|---|
| Enclosure size | Large or bespoke enclosure | Standard off-the-shelf enclosure |
| Component specification | High-end brands, safety-rated components | Standard industrial grade |
| I/O count | High input/output count, remote I/O | Low I/O, simple control logic |
| Safety requirements | Safety PLC, PLd or PLe rated circuits | Standard safety relay |
| Documentation | Full as-built drawings, third-party certification | Basic schematic set |
What do you need to tell your supplier?
You do not need to know the technical detail to brief a panel build supplier effectively. You do need to be able to answer these questions clearly.
- What does the panel need to control? Describe the machine or process in plain terms. How many motors, how many sensors, what needs to start, stop, or respond to what.
- What is the electrical supply? Single phase or three phase, voltage, available fuse or breaker rating at the distribution board.
- Where will the panel be installed? Indoor or outdoor, temperature range, whether there is dust, moisture, or chemicals present. This determines the enclosure rating your panel needs.
- Are there any safety requirements? Emergency stop, light curtains, safety gates anything that needs to be integrated into the panel's safety circuit.
- What is your programme? When does the machine need to be running? Are there planned shutdowns the installation can use, or does work need to happen around a live production schedule?
- What PLC platform do you use? If you have an existing installed base of Siemens, Rockwell, Mitsubishi, or another platform, consistency across your site simplifies maintenance and spares holding.
A good supplier will ask all of these questions in a first conversation. If they do not, that is worth noting.
What should a finished panel include?
Beyond the panel working correctly, there are a number of things a well-built panel should come with as standard.
- As-built drawings. A full set of electrical schematics reflecting exactly how the panel was built, not just how it was designed. These are essential for any future modifications or fault finding.
- Wire and terminal labelling. Every wire and terminal should be clearly labelled, matching the drawings. This is the difference between a maintenance engineer finding a fault in ten minutes and spending half a day tracing wires.
- Component documentation. Datasheets, certificates, and any compliance documentation for the components installed.
- Test records. A record of what was tested at FAT and the results, signed off by the engineer who carried out the testing.
Ask before you sign off: When a panel is delivered, ask to see the as-built drawings and test records before accepting it. These documents protect you if there is ever a dispute about what was supplied, and they are essential if you ever need to modify the panel in future.
How long does a panel build take?
Build times vary depending on complexity. A simple panel with standard components and a clear brief can be built and tested in one to two weeks. Mid-complexity panels with drives, safety circuits, and higher I/O counts typically take three to four weeks. Large or bespoke panels, or those with long-lead components, will run to five or six weeks from order to delivery. These are build timelines only. Allow additional time at the front end for design and drawing approval, and at the back end for installation and commissioning.
The single biggest cause of delays is an incomplete brief at the start of the project. Every time a design needs to be revised because a requirement was not captured upfront, time is lost. The more clearly you can describe what you need at the outset, the more predictable your programme will be.
Choosing the right supplier
Duke Control Systems builds panels across the full range of complexity. If you have your drawings done and just need a quality build with proper documentation, we can work to your specification. If you need us to take a brief and manage the whole project from electrical design through to commissioning on site, we do that too. The scope is whatever suits your project.
Some customers want a single panel built quickly to a tight budget. Others want a full turnkey solution where we own everything from design to handover. Both are straightforward for us, and we will tell you honestly which approach makes sense for what you are trying to do.
Whoever you speak to, ask to see examples of previous work, confirm they build to current standards, and make sure you will receive as-built drawings and test records at handover. These are not optional extras on a well-run project.