| Insulator type | AC anti-pollution type | |||
| GB standard No. | XHP-240 | XHP-300 | XHP4-300 | |
| Fig | 1 | 1 | 2 | |
| Specified mechanical load (kN) | 240 | 300 | 300 | |
| Class | U240BSP | U300B | U300BP | |
| Nominal unit spacing (mm) | 170 | 195 | 195 | |
| Nominal diameter (mm) | 320 | 320 | 380 | |
| Nominal creepage distance (mm) | 550 | 485/505 | 690 | |
| Ball & socket size | 24 | 24 | 24 | |
| Electro mechanical failing load (kN) | 240 | 300 | 300 | |
| Mechanical routine test load (kN) | 120 | 150 | 150 | |
| Power frequency withstand voltage | Dry kV | 90 | 80 | 100 |
| Wet (kV) | 55 | 45 | 60 | |
| Lightning impulse withstand voltage (kV) | 135 | 130 | 140 | |
| Power frequency puncture voltage (kV) | 130 | 130 | 140 | |
| Radio interference voltage | Test voltage to ground (kV) | 10 | 10 | 10 |
| Max . RIV at 1MHz (μV) | 50 | 50 | 50 | |
| Weight (kg) | 15.5 | 14.6 | 21.0 | |
| Applicable standard: GB IEC AS BS IS | ||||
