Round rubber festoon cable for overhead crane trolley systems. Type (N)GRDGOEU. 0.6/1 kV, EPR/PCP sheath, 240 m/min trolley speed, 15 N/mm² tensile. Single, 3-core, 4-core, 5-core and multicore options.
Festoon cables are the overhead trolley system alternative to drum reeling for crane power supply. Supported at regular intervals along a catenary, the cable hangs in a series of loops — extending and contracting as the crane trolley travels along the beam. Round rubber festoon cables in the (N)GRDGOEU design family are the standard choice for overhead crane festoon systems, offering the combination of high trolley speed (240 m/min), torsional flexibility, and robust EPR/PCP construction required for long-term crane service.
Unlike drum reeling cables, festoon cables experience lower tensile loads but require outstanding lateral flexibility and torsional consistency to maintain even festoon loop spacing throughout the cable service life.
| Parameter | Value |
|---|---|
| Rated Voltage | 0.6/1 kV |
| AC Test Voltage | 3.5 kV (5 min) |
| Max Conductor Temp | 90 °C |
| Short-Circuit Temp | 250 °C |
| Max Tensile Load | 15 N/mm² |
| Torsional Stress | ±25°/m |
| Festoon Trolley Speed | Up to 240 m/min |
| Min Bending Radius | 20 × OD (S-type) |
| Flex Temp | −35 °C to +80 °C |
| Fixed Install Temp | −50 °C to +80 °C |
| Type | Cores | Cross-Section |
|---|---|---|
| Single core | 1 | 25 – 240 mm² |
| Power (3-core + earth split) | 3+E | 4 – 50 mm² |
| Power (4-core) | 4G | 4 – 50 mm² |
| Power (5-core) | 5G | 4 – 16 mm² |
| Control | 12 – 36 cores | 1.5 – 3.5 mm² |
| Bus cable | Power + data pair | Custom |
Festoon cables flex primarily in one plane — the anti-torsion braid and round construction ensure consistent loop geometry without the cable twisting or coiling between support clips.
EPR insulation remains flexible to −35 °C operation — important for overhead crane systems in unheated steel fabrication facilities and cold-store buildings where PVC cables become stiff and brittle.
Individual core shielding (tinned Cu braid, ≥60%/≥80%) suppresses interference from crane drive inverters and motor switching, protecting control and bus cable signals in the same festoon run.
High-speed crane trolleys require cables that recover quickly to proper festoon loop shape after maximum extension — the EPR/PCP construction maintains loop memory and consistent clip loading at all speeds.
