Description
U40B Porcelain Disc Insulator Technical Specifications
| Type | XP-40 | XP-40C | XP-70 | XP-70C | XP-80 | XP-100 |
| IEC Class | U40B | U40C | U70BL | U70C | U80BL | U100BL |
| Coupling size | 16 | 16C | 16 | 16C | 16 | 16 |
| Diameter (mm) | 190 | 190 | 255 | 255 | 255 | 255 |
| Spacing (mm) | 140 | 140 | 146 | 146 | 146 | 146 |
| Creepage distance (mm) | 200 | 200 | 320 | 320 | 320 | 320 |
| Combined M&E strength (kN) | 40 | 40 | 70 | 70 | 80 | 100 |
| Impact strength (N.m) | 5 | 5 | 6 | 6 | 7 | 7 |
| Routine proof test load (kN) | 20 | 20 | 35 | 35 | 40 | 50 |
| Power frequency dry withstand voltage (kV) | 55 | 55 | 70 | 70 | 70 | 70 |
| Power frequency wet withstand voltage (kV) | 30 | 30 | 40 | 40 | 40 | 40 |
| Dry lightning impulse withstand voltage (kV) | 75 | 75 | 100 | 100 | 100 | 100 |
| Power frequency puncture voltage (kV) | 90 | 90 | 110 | 110 | 110 | 110 |
| Test voltage RMS to ground (kV) | 7.5 | 7.5 | 10 | 10 | 10 | 10 |
| Maximum RIV at 1000kHz (μv) | 50 | 50 | 50 | 50 | 50 | 50 |
| Net weight, approximate (kg) | 2.8 | 2.9 | 4.7 | 4.8 | 5.0 | 5.3 |
