Conductors

Solid annealed bare copper conductors conforming to CCITT Yellow

Book Vol. III – 2-G.541 b article, IEC 28 and ASTM B3

Insulation

Foam-skin polyole­n conforming to ASDM D1248 to BS 6234 Type 03

Cable Assembly

Twisted pairs, cabled into sub-units, cabled in a circular form

Color Code

As indicated below

Filling

Compound

Water resistant ­lling compound, applied to the gaps between the pairs

Tape wrap

Non hygroscopic polyester tape, wrapped with 30% overlap

Identifi­cation

tape

A suitable tape, durably marked with the manufacturer’s name, year of

manufacture and type of cable is placed under the core covering

Flooding

compound

Water resistant ‑flooding compound, applied between the core wrap and

the aluminum foil

Screen ( Shield)

Copolymer coated aluminum foil having thickness of 0.3mm, bonded to

the outer jacket, conforming to ASTM B736

Outer Jacket

Black PE compound

Nominal Conductor Diameter (mm)

0.63

Maximum Conductor Diameter (mm)

0.64

Minimum Conductor Elongation, %

15

Insulated Conductor diameter (mm)

1.15

Insulation ultimate tensile force minimum (N)

3.0

DC resistance @20˚C Ohm/km Maximum Average

58

DC resistance @20˚C Ohm/km Maximum for 1% of cases

60

Mutual Capacitance nF/km, max Average

56

Mutual Capacitance nF/km, max for 1% of cases

60

Pair to pair capacitance unbalance, pF max

275

Insulation Resistance, 500V DC Minimum Mohm.km

1500

Pair No

Colour of conductor insulation

A – wire

B – wire

1

White

Blue

2

White

Orange

3

White

Green

4

White

Brown

5