FOUNDATION Fieldbus cable for use in Process Automation - UL-verified

Article number Article designationNumber of pairs and cable diameterOuter diameter [mm]Copper index (kg/km)Weight (kg/km)
UNITRONIC® BUS FF 21 x 2 x 1.17.939.782
UNITRONIC® BUS FF 31x2x1.1 + 1x1.1 Ø7.948.393
PVC - Armoured
UNITRONIC® BUS FF 3 ARM (YE)1x2x1.1 + 1x1.1 Ø12.3125182
UNITRONIC® BUS FF 3 ARM (BU)1x2x1.1 + 1x1.1 Ø12.3125182


  • Cables meet the requirements of ISA/SP50 and the FOUNDATION™ field bus for the cable type A.

Application range

  • FOUNDATION™ Fieldbus is used in intrinsically safe areas, especially in the field of Process Automation
  • Fixed Installation

Product features

  • UV-resistant
  • Extended temperature range

Norm references / Approvals

  • With UL/CSA certification (CMG/PLTC)

Product Make-up

  • 2-core, not armoured, with device ground
  • 3-core, unarmoured, with device ground
  • 3-core, armoured (longitudinally welded, spiral corrugated copper sheath) with device ground
  • Outer sheath: PVC, yellow
    Armoured Version: PVC, yellow and blue

Classification ETIM 5

  • ETIM 5.0 Class-ID: EC000830
  • ETIM 5.0 Class-Description: Data cable

Classification ETIM 6

  • ETIM 6.0 Class-ID: EC000830
  • ETIM 6.0 Class-Description: Data cable

Peak operating voltage

  • 300 V

Conductor resistance

  • ≤ 24 Ohm/km

Minimum bending radius

  • 15 x outer diameter

Test voltage

  • 1500 V

Characteristic impedance

  • 100 ± 20 Ohm at 31.25 kHz

Temperature range

  • -40 °C or -25 °C to +105 °C, see data sheet

  • Unless specified otherwise, the shown product values are nominal values. Detailed values (e.g. tolerances) are available upon request.
  • Copper price basis: EUR 150/100 kg. Refer to catalogue appendix T17 for the definition and calculation of copper-related surcharges.
  • Please find our standard lengths at: www.lappkabel.de/en/cable-standardlengths
  • Foundation™ is a trademark of the Fieldbus Foundation
  • Photographs and graphics are not to scale and do not represent detailed images of the respective products.