How Larger Conductors Shape Control Panel Design

Larger conductors change how a control panel is laid out and built.

As conductor sizes increase, routing becomes less forgiving. Cables are stiffer, bending radius becomes a constraint, and space inside the panel is used more quickly than expected. What looks workable in a layout can become difficult once cables are being brought in and positioned.

At higher currents, panel layout is often driven more by cable than by components.

When Installation Starts to Shape the Design

Once electrical requirements are met, installation often becomes the limiting factor in higher current applications.

As conductor sizes increase, access also changes. Getting tools onto terminals, applying the correct tightening torque, and securing a reliable connection takes more effort. These are common challenges, but they influence how the panel is arranged and how long it takes to build.

Connection Points Start to Matter More

At this point, connection points become part of the build process.

Terminal blocks need to accommodate larger cable sizes while still allowing enough room to position and secure them properly. The physical design of the terminal affects how easily connections can be made, particularly in sections of the panel where larger conductors are being terminated or distributed.

Terminating Larger Conductors in Practice

Working with larger conductors inside a panel comes down to getting everything into position.

Cables need to be routed without excessive strain, bent within acceptable limits, and aligned so they can be inserted and secured correctly. When space is limited, each of these steps becomes more difficult.

Spacing between terminals, access to connection points, and overall layout all influence how the panel is built. Positioning and access end up driving how the connection is made.

Material Compatibility and Long-Term Reliability

In some applications, supply conductors differ from internal wiring, which introduces another consideration.

Connecting aluminium and copper conductors directly can lead to galvanic corrosion over time, affecting connection quality and long-term reliability. This becomes relevant in systems where mixed conductor types are used.

Bi-metal terminal blocks, such as the Linkwell KE62.1, are designed for this situation. By combining copper and aluminium within the terminal, they provide a stable connection point for dissimilar conductors while reducing the risk of corrosion.

The KE62.1 supports conductor sizes from 16 to 95 mm² and is rated up to 245A for copper and 220A for aluminium, making it suitable for higher current applications where both conductor size and material need to be considered.

Flexibility in Terminal Selection

Different connection technologies suit different parts of a panel.

Screw connection, spring clamp, and push-in terminals each offer advantages depending on conductor size, installation approach, and maintenance requirements. Terminal block ranges from Conta-Clip and Phoenix Contact allow terminal strips to be configured to suit both electrical and physical constraints.

Standardised accessories for bridging, marking, and testing also contribute to a more structured and maintainable panel, particularly in larger or repeat builds.

Designing for the Build

Terminal selection is often approached from an electrical perspective, but in higher current applications, it becomes part of the mechanical design of the panel.

Cable routing, available space, access for termination, and material compatibility all influence how the system comes together. These factors become just as important once electrical requirements are satisfied.

Once conductor size increases, space, access, and routing tend to drive the design decisions that follow.

Layout decisions start to matter once conductor size limits how cables can actually be positioned. Before finalising a layout, it’s worth checking how those conductors will fit and how connections will be made. This is often where constraints show up, and where small changes can make the build more straightforward.

Switches Plus Components supplies a range of terminal solutions to support these applications, including bi-metal terminals, modular terminal blocks, and complete terminal systems for industrial and switchboard installations.