Telephone Cables
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Ordering Information

Indoor Central Office Cables to CW 1308

Application

The cables are designed to handle low frequency signals for short range applications, suitable for internal connection of telephone systems and other communications equipment. Also, they are designed to be terminated in insulation displacement connectors (IDC).Insulated and sheathed in PVC or LSZH, these cables offer an extremely cost effective general signal cable for fixed installation.

Standards

CW 1308

Construction

CW 1308

CW 1308

Conductors

Solid annealed copper sized 0.4/0.5mm as per class 1 of BS 6360/IEC 60228

Insulation

Colour coded PVC TI 54/LSZH for copper conductor & PVC TI 54/LSZH for the 1.38mm earth conductor

Twisted Pairs

Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk

Cabling Element

Pairs or triples

Cable Core Assembly

There are two modes of construction: layer construction and unit construction. For layer construction, cables are laid up in concentric layers to form a compact and circular cable. Layer construction is for general use, including two cables for installation in customer’s premises where a good appearance is required. For Unit construction, the elements shall be pairs and laid up as units or sub-units. This include unit of 20 pairs which contain an insulated earth conductor of 1.38mm, for use with customer distribution schemes; unit of 16 pairs for use with the binary number system and unit of 30 pairs for use with Pulse Code Modulation (PCM) systems.

Core Wrapping

Cable containing more than 6 pairs have a polyester tape applied over the cable core prior to sheathing

Screen (optional)

A 24μ aluminium polyester foil shield can be provided for fully enclosing the core with an overlap

Sheath

PVC TM51 grade or LSZH compound. Grey, White, Cream or Black colours are standard

Ripcord

Nylon ripcord may be placed parallel to the cores to facilitate sheath removal

Drain Wire (optional)

For screened cables, a solid tinned 0.5mm copper drain wire may be longitudinally laid to ensure electrical continuity of the screen

Electrical & Mechanical Properties

Nominal Conductor Diameter mm 0.4 0.5 1.38
Conductor Size mm2 0.126 0.196 1.495
Maximum Conductor Resistance @20°C Ω/km 153 97.8 12.4
Minimum Insulation Resistance 500V DC @20°C MΩ.km 50 50 N/A
Maximum Capacitance Unbalance @0.8KHz-3.0KHz pair-to-pair pF/500m 200(Unit)/300(Layer) 500 N/A
Minimum Insulation Thickness mm 0.15 0.15 0.55
Maximum Insulated Conductor Diameter mm 0.85 0.95 3.5

Mechanical and Thermal Properties

Temperature range during operation (fixed state): -30°C – +70°C

Temperaturerange during installation (mobile state): -20°C – +50°C

Minimumbending radius: 7.5 x Overall Diameter

Color Code

Make Up & Unit Identification Colours – 16 Pair Unit

Pair Size 8 Pairs 16 Pairs 32 Pairs 64 Pairs 128 Pairs 256 Pairs
Number of Units
Centre
1st Layer
2nd Layer
½ 1 4 X ½ 1 4 X ½ 1
6 X ½ 6 5
10
Unit No. Colours of Unit Lappings
1 ORANGE ORANGE ORANGE ORANGE ORANGE ORANGE
2 GREEN ORANGE GREEN ORANGE
3 NATURAL ORANGE NATURAL
4 GREEN NATURAL NATURAL
5 NATURAL NATURAL
6 NATURAL GREEN
7 NATURAL ORANGE
7 GREEN NATURAL
9-15 NATURAL
16 GREEN

Note: ½ refers to sub-units of 8 Pairs.

Make Up & Unit Identification Colours – 20 Pair Unit

Pair Size 10 Pairs 20 Pairs 40 Pairs 50 Pairs 80 Pairs 100 Pairs 160 Pairs 320 Pairs
Number of Units
Centre
1st Layer
2nd Layer
½ 1 4 X ½ 5 X ½ 1 1 4 X ½ 1
6 X ½ 8 X ½ 6 5
** 10
Unit No. Colours of Unit Lappings
1 ORANGE ORANGE ORANGE ORANGE ORANGE ORANGE ORANGE ORANGE
2 GREEN NATURAL ORANGE ORANGE GREEN ORANGE
3 GREEN* NATURAL NATURAL ORANGE NATURAL
4 GREEN NATURAL NATURAL NATURAL
5 GREEN NATURAL NATURAL
6 NATURAL GREEN
7 NATURAL ORANGE
7 GREEN NATURAL
9-15 NATURAL
16 GREEN

Note 1: ½ refers to sub-units of 10 Pairs.
Note 2: These cables include the single 1.38mm diameter insulated conductor.
* The Green colour lapping shall be applied to the last ½ unit.
** At the manufacturer’s discretion the first layer may be 4 x 1.
Alternatively the centre layer may be 5 x 1 in which case the unit lappings shall be coloured Orange,3 x 1 Natural, Green.

Make Up & Unit Identification Colours – 30 Pair Unit

Pair Size 30 Pairs 120 Pairs 150 Pairs
Number of Units
Centre
1st Layer
1 1 1
6 X ½ 8 X ½
Unit No. Colours of Unit Lappings
1 ORANGE ORANGE ORANGE
2 ORANGE ORANGE
3 NATURAL NATURAL
4 GREEN BLUE
5 GREEN

Note 1: ½ refers to sub-units of 15 Pairs.

Colour Scheme for Pairs & Triples

Cabling
Element
No.
a-wire b-wire Cabling
Element
No.
a-wire b-wire Cabling
Element
No.
a-wire b-wire
1 WHITE Blue BLUE White 11 BLACK Blue BLUE Black 21 VIOLET Blue BLUE Violet
2 WHITE Orange ORANGE White 12 BLACK Orange ORANGE Black 22 VIOLET Orange ORANGE Violet
3 WHITE Green GREEN White 13 BLACK Green GREEN Black 23 VIOLET Green GREEN Violet
4 WHITE Brown BROWN White 14 BLACK Brown BROWN Black 24 VIOLET Brown BROWN Violet
5 WHITE Grey GREY White 15 BLACK Grey GREY Black 25 VIOLET Grey GREY Violet
6 RED Blue BLUE Red 16 YELLOW Blue BLUE Yellow 26 PINK Blue BLUE Pink
7 RED Orange ORANGE Red 17 YELLOW Orange ORANGE Yellow 27 PINK Orange ORANGE Pink
8 RED Green GREEN Red 18 YELLOW Green GREEN Yellow 28 PINK Green GREEN Pink
9 RED Brown BROWN Red 19 YELLOW Brown BROWN Yellow 29 PINK Brown BROWN Pink
10 RED Grey GREY Red 20 YELLOW Grey GREY Yellow 30 PINK Grey GREY Pink

In each triple, the c-wire shall be coloured TURQUOISE

Dimensions And Weight

Cable Code Number of
Pairs
Minimum Insulation Thickness
mm
Make Up Minimum Sheath Thickness
mm
Maximum Overall
Diameter
mm
Nominal
Weight
kg/km
0.4mm Conductor, 0.85mm Insulated Wire-Layer (Pair)
TP1308-YY-2P04 2 0.15 Layer 0.4 3.9 15
TP1308-YY-3P04 3 0.15 Layer 0.5 5.3 21
TP1308-YY-4P04 4 0.15 Layer 0.5 5.8 25
TP1308-YY-6P04 6 0.15 Layer 0.6 6.8 37
TP1308-YY-10P04 10 0.15 Layer 0.6 8.3 54
TP1308-YY-12P04 12 0.15 Layer 0.7 8.9 61
TP1308-YY-20P04 20 0.15 Layer 0.7 10.4 95
TP1308-YY-25P04 25 0.15 Layer 0.8 11.1 115
0.5mm Conductor, 0.95mm Insulated Wire-Layer (Pair)
TP1308-YY-3P05 3 0.15 Layer 0.65 5.0 25
TP1308-YY-4P05 4 0.15 Layer 0.65 5.8 30
TP1308-YY-6P05 6 0.15 Layer 0.6 6.8 40
TP1308-YY-10P05 10 0.15 Layer 0.6 8.3 50
TP1308-YY-12P05 12 0.15 Layer 0.7 9.1 75
TP1308-YY-15P05 15 0.15 Layer 0.7 9.8 98
TP1308-YY-20P05 20* 0.15 Layer 0.8 10.7 140
TP1308-YY-25P05 25 0.15 Layer 0.8 11.4 184

*This cable has an additional 0.5mm insulated conductor coloured VIOLET.

Cable Code Number
of
Triples
Minimum Insulation
Thickness
mm
Minimum Primary
Sheath Thickness
mm
Minimum Secondary
Sheath Thickness
mm
Maximum Overall
Diameter
mm
Nominal
Weight
kg/km
0.4mm Conductor, 0.85mm Insulated Wire-Layer (Triple)
TP1308-YY-1T04 1 0.15 0.4 3.8 17
TP1308-YY-5T04 5 0.15 0.4 0.8 13.0 45
0.5mm Conductor, 0.95mm Insulated Wire-Layer (Triple)
TP1308-YY-1T05 1 0.15 0.4 4.0 20
TP1308-YY-5T05 5 0.15 0.4 0.8 13.5 65

Cable Code Number
of
Pairs
Minimum Insulation
Thickness
mm
Size of Unit Minimum Sheath
Thickness
mm
Maximum Overall
Diameter
mm
Nominal
Weight
kg/km
0.4mm Conductor, 0.85mm Insulated Wire-Unit (Pair)
TP1308-YY-8P04 8 0.15 1/2*16 0.6 7.2 45
TP1308-YY-16P04 16 0.15 16 0.7 9.8 80
TP1308-YY-32P04 32 0.15 16 0.8 12.0 145
TP1308-YY-64P04 64 0.15 16 1.1 16.0 260
TP1308-YY-30P04 30 0.15 30 0.8 11.8 130
TP1308-YY-120P04 120 0.15 30 1.6 24.8 480
TP1308-YY-150P04 150 0.15 30 1.7 26.0 590
0.5mm Conductor, 0.95mm Insulated Wire-Unit (Pair)
TP1308-YY-8P05 8 0.15 1/2*16 0.6 7.6 65
TP1308-YY-16P05 16 0.15 16 0.7 10.2 115
TP1308-YY-32P05 32 0.15 16 0.8 12.4 205
TP1308-YY-64P05 64 0.15 16 1.1 16.5 390
TP1308-YY-128P05 128 0.15 16 1.6 25.4 785
TP1308-YY-256P05 256 0.15 16 2.0 35.2 1460
TP1308-YY-(10P+E)05 10+E 0.15 1/2*20 0.6 8.6 85
TP1308-YY-(20P+E)05 20+E 0.15 20 0.7 12.0 160
TP1308-YY-(40P+E)05 40+E 0.15 20 0.9 15.0 371
TP1308-YY-(50P+E)05 50+E 0.15 20 1.0 17.0 427
TP1308-YY-(80P+E)05 80+E 0.15 20 1.2 22.5 610
TP1308-YY-(100P+E)05 100+E 0.15 20 1.5 27.0 630
TP1308-YY-(160P+E)05 160+E 0.15 20 1.7 30.3 1059
TP1308-YY-(320P+E)05 320+E 0.15 20 2.2 39.5 2255
TP1308-YY-30P05 30 0.15 30 0.8 12.2 190
TP1308-YY-120P05 120 0.15 30 1.6 25.1 765
TP1308-YY-150P05 150 0.15 30 1.7 26.0 1100

Note: For those cables with BT designation suffixed E contain a 1.38mm diameter insulated earth conductor