Typical Cross section for Armoured Cable

Technical Details:

Conductor Diameter Conductor Resistance at 20ºC Attenuation at 20ºC
0.90mm 28 (Each Core) Ω/Km (Max)
56 (loop) Ω/Km (Max)
4.40 dB/Km (Max. Avg.) at 150KHz
2 dB/Km (Max. Avg.)at 300-3400 Hz
1.4mm 11.6 (Each Core) Ω/Km (Max)
23.2 (loop) Ω/Km (Max)
0.3 dB/Km (Max. Avg.) at 0.8KHz
0.8 dB/Km (Max. Avg.) at 5KHz
1.3 dB/Km (Max. Avg.) at 21KHz
2.5 dB/Km (Max. Avg.) at 150KHz
Mutual Capacitance Capacitance Unbalance (800 Hz to 1000 Hz)
50 ± 2.5 nF/ Km (avg.) Pair to Pair Pair to Earth
50 ±6 nF/Km (individual) 300 pF/Km (max.) 1500 pF/Km (max. avg.)

Insulation Resistance 5000 mega Ωs / Km (min.)

0.90 mm ELFEXT : 150 KHz 55 dB/Km Ind. (Min.) 67.8 dB/Km (RMS) (Min.) NEXT : 55 dB (min.) at 150 KHz
1.4 mm ELFEXT : at 0.8KHz, 5KHz 21 KHz & 150 KHz 60.0 dB/Km Ind. (Min.) 70.8 dB/Km (RMS) (Min.) NEXT : 55 dB (min.) at 0.8 KHz, 5 KHz, 21 KHz & 150 KHz

Reduction Factor ( Field intensity of 50v to 450v) : 0.10 (Max) Characteristic Impedance (Ω)

0.90 mm 470 +/- 15% Ω at 0.8KHz
195 +/- 15% Ω at 5.0 KHz
1.4 mm 310 +/- 15% Ω at 0.8KHz
150 +/- 15% Ω at 5.0 KHz
110 +/- 15% Ω at 21.0 KHz
100 +/- 15% Ω at 150.0 KHz

Color Coding for Quad :

No1 - White, Orange, Red , Green No2 - White, Blue, Red , Green
No3 - White, Brown, Red , Green No4 - White, Green, Red , Green
No5 - White, Yellow, Red , Green No6 - White, Black, Red , Green

Cable Construction Details

Conductor Round wire of annealed high conductivity copper
Insulation Each conductor is insulated with solid PE
Quadding Four insulated conductors stranded to form a star quad.
Laying Up The quads are assembled to form a symmetrical core with a right hand lay. Polyethylene strings of required diameter may be used as fillers, if necessary.
Filling & core wrapping The cable core is fully filled with water -resistant compound and wrapped with polyethylene.
Moisture Barrier Aluminium tape coated with co-polymer on both sides is applied longitudinally over the cable core with a specified overlap.
Sheathing The screened cable core is sheathed with black polythene compound as per BS:6234.
Screening & protection The cable core with inner sheath is surrounded by a reasonably close fitted screen of Aluminium in the form of wires/ strips . The aluminium screen is wrapped with a single layer of woven tape impregnated with Barium chromate with overlap.
Intermediate sheath Further protection of screening is provided by extruded PVC/PE sheath over screening.
Armouring Armouring with two applications of Galvanized steel tape each applied helically with a specified gap.
Jacketing The armoured cable is finally jacketed with black PVC/PE compound.


  • Suitable for Direct burial application
  • Armoured construction
  • Availability of standard conductor sizes of 0.9 mm & 1.4 mm diameter
  • Available in 4 and 6 quads.
  • Suitable for use on AC systems (earthed or unearthed) for rated voltage up to and including 1100 volts.
  • These cables may be used on DC systems for rated voltages up to and including 1500 volts on earth.