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

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

Mechanical and Thermal Properties

Temperature range during operation (fixed state): -30°C – +70°C
Temperature range during installation (mobile state): -20°C – +50°C 
Minimum bending radius: 7.5 x Overall Diameter

Color Code

Make Up & Unit Identification Colours – 16 Pair Unit

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

Make Up & Unit Identification Colours – 20 Pair Unit

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

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

Colour Scheme for Pairs & Triples

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

Dimensions And Weight

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

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