(HOFR) Welding cable Single core EPR insulated CSP sheathed to BS 638 part 4 100V*
Application
For secondary connection to automatic or hand held metal arc welding electrodes.
Specification
- Conductor: Flexible class 6 tinned copper to BS 6360
- Insulation: Ethylene propylene rubber (EPR)
- Sheath: Chlorosulphonated polyethylene (CSP)
- Available in Black or Orange
- Voltage rating: 100V
- Temperature rating: 85 Deg C max conductor operating temperature
- HOFR Heat and oil resistant, flame retardant
- Rated at 100V* when used for welding purposes. May be used at up to 450 V providing the cables are adequately protected from damage to the insulation in control panels, switchgear etc.
DUTY CYCLE: The duty cycle is defined as the time for which the current flows , expressed as a percentage of the complete cycle, which is taken as 5 minutes. Since the length of time for which current flows during welding operation varies from occasional to continuous operation . As conductor temperature varies according to time in use as well as current the following ratings are given as a guide .
Automatic welding: up to 100 %
Semi-automatic welding: 30 - 85 %
Manual welding: 30 - 60 %
Very intermittent or occasional welding: up to 20 %
Ambient temperature: Cable operating temperature also varies according to the prevailing ambient temperature. EPR/CSP cables are designed to give optimum performance up to an operating temperature of 85 Deg C at an ambient temperature of 25 Deg C. The reduction factors for increased ambient temperatures are :
| AMBIENT TEMPS | |||
|---|---|---|---|
| 30 Deg | 35 Deg | 40 Deg | 45 Deg |
| REDUCTION FACTORS | |||
| 0.96 | 0.91 | 0.87 | 0.82 |
Operations under severe conditions
High operating temperatures or prolonged maximum loading of the cable reduce the service life or makes the cable too hot to handle. Thus under conditions where a long service life cannot be expected or where a high surface temperature is tolerable, the current rating for 25 Deg C may be applied up to an ambient temperature of 40 Deg C.
| SIZE MM | STRANDING MM | NOMINAL O/DIA MM | WEIGHT KG / KM | MAX DUTY CYCLE 100% | MAX DUTY CYCLE 60% | MAX DUTY CYCLE 30% |
|---|---|---|---|---|---|---|
| 16 | 513 / 0.20 | 10.9 | 212 | 135 | 175 | 245 |
| 25 | 783 / 0.20 | 12.5 | 300 | 180 | 230 | 330 |
| 35 | 1107 / 0.20 | 14 | 403 | 225 | 290 | 410 |
| 50 | 1566 / 0.20 | 16 | 560 | 285 | 370 | 520 |
| 70 | 2214 / 0.20 | 18.6 | 776 | 355 | 460 | 650 |
| 95 | 2997 / 0.20 | 21.2 | 1035 | 430 | 560 | 790 |
| 120 | 608 / 0.50 | 23.1 | 1300 | 500 | 650 | 910 |