CONSTRUCTION : voltage grade, size range & specifications
1. Single core cable :- Annealed tinned copper or aluminium conductor, insulated with silicon rubber & finally fibre glass braided & varnished.
2. Multi core cable :- Cores constructed as single core cable, distinguishably colour coded & laid up circular with asbestos worming & finally glass braided & varnished or asbestos braided & compounded.
Cable with other protective sheath such as silicone, neoprene & CSP sheath, wire braid or single wire or strip armoured/screened also can be supplied.
Voltage grade : usually 1000v/3300/600/6600v
Size range : upto 630 sq mm.
Specifications : genrerally to BS:6007, BS:6500 & IS:6380/IS:9968, IEC/540
These are normally elastomeric cables & are custom built to suit invidual application in contrast with other conventional cables, design of which is more or less standardised. The most noteworthy factor for developing elastomeric cables is in its application, where in continous vibration (as loco & coach speed on rails) are of prime importance. Cable however are simple in construction but they call for utmost care in raw material selection, process control & quality awareness.
1. High degree of quality & reliability during the entire span of operation.
The prime requirement for insulation & sheath used for loco & coach wiring are as following :
1. High temperature with standability
1. High mechanical strength
The railways have therefore opted EPR for insulation & CSP for outer sheath.
FLEXIBLE TRAILING CABLES FOR COAL MINES IS : 691-1984