Wire Identification
- Single and Multiple pairs
- Positive wire - White
- Negative wire - Black
- Single and Multiple triples
- Positive wire - White
- Negative wire - Black
- Compensating or balancing wire - Red
Element
An element consists of a pair or a triple formed by twisting the wires together.
Elements are twisted with different twist lengths to reduce interference between
them.
Element Identification
The white wire of an element is numbered (O.D. 2.2 mm) minimum or color coded for
all cables except for a single pair and a single triple.
Screened Element (IS)
The twisted element is wrapped with aluminium/ polyester laminate as a tape with
the bare/ tinned copper wire laid in contact with the aluminium side of the tape.
A further layer of polyester tape is applied over the core.
Cable Core
The cable core is formed by assembling the required number of elements, which are
laid in concentric layers as necessary. A Polyester tape is applied over the core.
Screened Core (CS)
The aluminium/ polyester laminate is applied as a screen over the core in lieu of
the plain tape with the tinned copper drain wire laid in contact with the aluminium
side of the tape.
Sheath
The wrapped core is sheathed with black PVC or specified color.
Armour (SWG)
A further protective covering can be provided by the application of galvanized steel
wires/ strips and a black PVC over sheath or specified color.