| Insulator type | AC normal type | ||||
| GB standard No. | XP-70 | XP-70C | XP1-70 | XP4-70 | |
| Fig | 1 | 2 | 1 | 1 | |
| Specified mechanical load (kN) | 70 | ||||
| Class | U70BL | U70C | U70BS | U70BL | |
| Nominal unit spacing (mm) | 146 | 146 | 127 | 146 | |
| Nominal diameter (mm) | 255 | 255 | 255 | 270 | |
| Nominal creepage distance (mm) | 295/320 | 295 | 295/320 | 330 | |
| Ball & socket size | 16 | 16C | 16 | 16 | |
| Electro mechanical failing load (kN) | 70 | 70 | 70 | 70 | |
| Mechanical routine test load (kN) | 35 | 35 | 35 | 35 | |
| Power frequency withstand voltage | Dry kV | 70 | 70 | 70 | 70 |
| Wet (kV) | 40 | 40 | 40 | 40 | |
| Lightning impulse withstand voltage (kV) | 100 | 100 | 100 | 100 | |
| Power frequency puncture voltage (kV) | 110 | 110 | 110 | 110 | |
| Radio interference voltage | Test voltage to ground (kV) | 10 | 10 | 10 | 10 |
| Max . RIV at 1MHz (μV) | 50 | 50 | 50 | 50 | |
| Weight (kg) | 4.7/4.9 | 4.7 | 4.7/4.8 | 5.0 | |
| Applicable standard: GB IEC AS BS IS | |||||
