Cable management in the control cabinet - how to do it right?

How do you size and route cable ducts correctly?

The wiring duct (cable duct) guides wires bundled and protected between terminals, rows and devices. It should only be filled to about 60 to 70 percent so heat can dissipate, spare wires have room and later changes stay possible without a rebuild.

Common ducts are slotted wiring ducts with toothed side walls that let wires exit sideways. The width follows the number and cross-section of the wires, the height follows the bundle diameter. An overfilled duct can no longer be closed and makes every rewiring difficult.

How do you set cable ties cleanly and without damage?

Cable ties bundle free wires outside the ducts, for example on doors or to moving assemblies. Set ties at an even spacing of about 25 to 30 mm and tighten them only enough to hold the bundle without pinching the insulation.

For a professional result and a defined tension, a cable tie tensioning tool is recommended - it cuts the excess flush and burr-free. Protruding sharp ends are an injury and damage hazard.

• Keep tie spacing even (approx. 25‑30 mm) for a tidy look and consistent strain relief.
• Cut the excess flush - no sharp edges that can cut wires or hands.
• Provide flexible bundles with a movement loop at doors and moving parts.
• Route door crossings with flexible wire and strain relief, not with rigid bundles.
• Use reusable or hook-and-loop ties where rewiring is frequent.

Why is clear labelling mandatory?

Every wire and device should be clearly identified so the wiring matches the circuit diagram. EN 61439 requires a traceable, permanent marking - it is the basis for fast fault finding and safe maintenance.

Proven options are slip-on wire markers, heat-shrink markers or printed labels from a labelling printer. The marking must resist abrasion, oil and temperature and must not fade over the service life.

Frequently asked questions