| Insulator type | AC normal type | |||
| GB standard No. | XP5-70 | XP5-70C | XP-80 | |
| Fig | 2 | 1 | 3 | |
| Specified mechanical load (kN) | 70 | 80 | ||
| Class | U70BL | U70C | U80BM/L | |
| Nominal unit spacing (mm) | 146 | 146 | 140/146 | |
| Nominal diameter (mm) | 200 | 200 | 255 | |
| Nominal creepage distance (mm) | 210 | 210 | 295 | |
| Ball & socket size | 16 | 16c | 160 | |
| Electro mechanical failing load (kN) | 70 | 70 | 80 | |
| Mechanical routine test load (kN) | 35 | 35 | 40 | |
| Power frequency withstand voltage | Dry kV | 50 | 50 | 70 |
| Wet (kV) | 30 | 30 | 40 | |
| Lightning impulse withstand voltage (kV) | 80 | 80 | 100 | |
| Power frequency puncture voltage (kV) | 110 | 110 | 110 | |
| Radio interference voltage | Test voltage to ground (kV) | 10 | 10 | 10 |
| Max . RIV at 1MHz (μV) | 50 | 50 | 50 | |
| Weight (kg) | 3.7 | 3.7 | 5.0 | |
| Applicable standard: GB IEC AS BS IS | ||||
