Product Number: 71740ELW

RS-485, 1 Pr #20 Str TC, PO Ins, OS+TC Brd, LSZH Jkt, Cca

RS-485, 1 Pair 20AWG (7x28) Tinned Copper, PO Insulation, Overall Beldfoil®+Tinned Copper Braid(65%) Shield, LSZH Outer Jacket, CPR Cca

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71740ELW
  • 71740ELW
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Specifications

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Suitable Applications

RS-485, POS; Computer communications; Low Voltage Analog Signals (4-20ma, 0-10v, ...); Low Voltage Digital Control (24v, …); Line Level Audio; Panel Wiring; serial communication (RS-485 standard) comprising of PLCs, VFDs, HMIs, motors, RTU, SCADA, etc. within noisy environments over long distance, etc.

Conductor

Element No. of Elements Size Stranding Material
Pair(s) 1 20 AWG 7x28 TC - Tinned Copper

Insulation

Element Material Nom. Thickness Nom. Insulation Diameter Color Code
Pair(s) PE - Polyethylene 0.82 mm (0.032 in) 2.60 mm (0.102 in) White/Blue & Blue/White

Outer Shield

Shield Type Material Coverage Drainwire Type
Tape Bi-Laminate (Alum+Poly) 100% 24 AWG (7x32) TC
Braid Tinned Copper (TC)

Outer Jacket

Material Nom. Thickness Nom. Diameter
LSZH - Low Smoke Zero Halogen (Flame Retardant) 0.9 mm (0.035 in) 7.80 mm (0.307 in)

Overall Cable Diameter (Nominal)

7.80 mm (0.307 in)

Electricals

Element Nom. Conductor DCR Nom. Capacitance Cond-to-Cond Nom. Capacitance Cond-to-Other (Conds + Shield) Nom. Characteristic Impedence Nom. Velocity of Prop. Max. Current
Pair(s) 36 Ohm/km (11 Ohm/1000ft) 40 pF/m (12 pF/ft) 78 pF/m 120 Ohm 66% 3.8 Amps per Conductor

High Frequency (Nominal/Typical)

Element Frequency [MHz] Nom. Insertion Loss (Attenuation)
Pair(s) 1 1.45 dB/100m (0.442 dB/100ft)

Voltage

Voltage Rating
300 V

Temperature

Operating Installation Storage
-45°C To +70°C -15°C To +70°C -45°C To +70°C

Bend Radius

Stationary Min. Installation Min.
39 mm (1.5 in) 78 mm (3.1 in)

Max. Pull Tension

250 N (56 lbf)

Bulk Cable Weight

69 kg/km (46 lbs/1000ft)

Environmental Suitability

Indoor - Euroclass Eca, Indoor, Non-Halogenated, Sunlight Resistance, Oil Resistance

Flammability / Reaction to Fire

IEC 60332-1-2

CPR Compliance

CPR Euroclass: Cca-s1,d1,a1

ISO/IEC Compliance

IEC 61034-2 - Smoke Density Min Transmittance = 60%

CENELEC Compliance

EN 50290-2-20

European Halogen Free Standards

IEC 62821-1 Halogen Free Compliance = Yes, IEC 60754-1 - Halogen Amount = Zero, IEC 60754-2 - Halogen Acid Gas Amount - Max. Conductivity = 2.5 µS/mm, IEC 60754-2 - Halogen Acid Gas Amount - Min. pH = 4.3

European Directive Compliance

EU CE Mark

UK Regulation Compliance

UKCA Mark

Other Standard Compliance(s)

DMX-512

Notes

This is a preliminary Technical Design Specification (TDS) which is subject to modification throughout the prototyping phase. The minimum business quantity to offer is 3km for the first order. This product will have Grey as standard color and 305mt or 500mt as standard put-ups. Additional options for colors and put-ups are available on special request. The estimated production lead time for the first order will be similar to the production lead time of 3107ENH plus extra 6-7 weeks. Please liaise with your Belden representative for confirmation.

Update and Revision

Revision Number: 0.21 Revision Date: 05-07-2025

Update and Revision

Revision Number: 0.21 Revision Date: 05-07-2025

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