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INTRODUCTION:
Rubber was the first insulant to be
used in Electric Cable manufacture but gave way to other
insulants like paper, PVC, XLPE etc.
Rubber is still considered the preferred insulation
for flexible cables and cables where very small bending
diameter is desired.
Copper / Aluminium Conductors are
both used generally in rubber cables. Annealed tinned
flexible conductor (class-5) is predominantly used in
rubber cables. However Cables with class 1 and class 2
conductor with either Copper or Aluminium can be supplied
on request.
Initially natural rubber
was used as both insulation and sheathing material, but
nowadays many synthetic materials are available for insulation
and sheathing. The details are as given below :
| |
Type Designation |
Basic
Rubber |
Max.
Cond. Temp. For Continuous Operation °C
|
Max
Cond. Temp for Shortckt. Operation °C
|
Remarks
|
|
| Insulation
|
| IE
1 |
Natural
Rubber |
60
|
200
|
Low
Voltage |
| IE
2 |
EPDM
|
90 |
250 |
Low
Voltage |
| IE
3 |
EPDM
|
90 |
250 |
High
Voltage |
| IE
4 |
PCP/CSP
|
90 |
250 |
Oil/Fire
Retardant |
| IE
5 |
Silicon
|
150(180 as per VDE) |
350 |
High
Temp. |
| Sheath
|
| SE
1 |
Natural
Rubber / SBR |
60 |
200 |
Normal
Duty |
| SE
2 |
Natural
Rubber / SBR |
60 |
200 |
Heavy
Duty |
| SE
3 |
NBRPVC/
PCP/CSP |
90 |
250 |
HR,
oil /flame retardant, Normal duty. |
| SE
4 |
NBRPVC/
PCP/CSP |
90 |
250 |
HR,
oil /flame retardant, Heavy duty. |
|
Specific
types are indicated subsequently.
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Introduction
