Home / Resource Center / Conductor Line or Festoon Cable?
Technical GuideConductor Line or Festoon Cable?
Crane power-supply systems compared: enclosed conductor line versus festoon cable, their advantages, maintenance needs, and which suits which facility.
How the two systems work
A conductor line is a conductive profile fixed along the runway. A current collector (carbon brush) on the crane slides along it to pick up power. In modern systems the conductors sit enclosed inside an insulating housing, removing both the touch risk and dust ingress.
In a festoon cable system, a flat cable is carried by trolleys running along a support track alongside the runway. As the crane moves, the cable bundle concertinas open and closed.
Which one, where
On short-to-medium runs, in a clean indoor environment, on a tight budget, festoon cable makes sense. It's simple to install and faults are easy to spot by eye.
On long runs, at high speeds, in dusty or humid environments, and outdoors, a conductor line comes out ahead. The weight and wind-whip of the cable bundle disappear, and it takes up less space along the runway.
In environments like food plants, paint shops and foundries, an enclosed conductor line is close to the only sensible option.
| Criterion | Conductor line | Festoon cable |
|---|---|---|
| Initial investment | Higher | More economical |
| Long runs | Advantageous | Cable bundle gets heavy |
| Space taken up | Little | Needs space along the support track |
| Dusty / corrosive environment | The enclosed type suits it | Sheath wears |
| Outdoors | Suitable (with the right IP rating) | Wind and UV cause problems |
| High speed | Suitable | Limited |
| Maintenance item | Brush wear, joint points | Trolleys, cable sheath |
| Fault diagnosis | Checking brushes and joints | Easy to spot by eye |
The maintenance side
On a conductor line, the current-collector carbon brushes are checked regularly for wear; a brush below a certain limit is replaced. If a level mismatch has developed at the profile's joints, the brush sparks and jumps — meaning the joints need adjusting.
On festoon cable, the trolley wheels, any crushing or cracking of the cable sheath, and the tension of the tow rope are checked. Outdoors, UV hardening of the cable sheath is a typical sign of ageing.
Technical terms
| Term | What it means |
|---|---|
| Conductor line | A conductive profile system running along the rail that carries power to the crane. |
| Current collector | The carbon-brush element that slides along the conductor line to pick up power. |
| Festoon cable | A flat cable carried by trolleys that concertinas open and closed as the crane moves. |
| IP rating | How well a piece of equipment is protected against dust and water (e.g. IP54, IP65). |
Frequently asked questions
Can I convert my existing festoon system to a conductor line?
Yes, this is a common modernization item. It requires installing conductor-line support brackets along the runway and adding a current-collector assembly on the crane.
I see sparking on the conductor line — is it dangerous?
Light sparking is usually a sign of brush wear or a level mismatch at a joint; left alone it damages the profile surface. In an explosive atmosphere it's never tolerated — an Ex-proof solution is required.