Description
U420B Toughened Glass Insulator Technical Specifications
DIMENSIONS
According to IEC 60305
IEC designation: U420B
Diameter of shell (D): 360 mm
Spacing (P): 205 mm
Min. nominal creepage distance: 550 mm
Couplings according to IEC 60120: 28
Approximate net weight: 14 kg
MECHANICAL PERFORMANCE
According to IEC 60383
Min mechanical failing load: 420 kN
Routine Test Load: 210 kN
ELECTRICAL PERFORMANCE
According to IEC 60383
Power Frequency Withstand Voltage, Wet: 55 kV
Lightning impulse withstand voltage: 165 kV
Withstand puncture voltage: 130 kV
COMPONENT PARTS
Dielectric shell: Toughened glass
Cap: Hot-dip galvanized cast iron
Pin: Hot-dip galvanized forged steel
Cotter key: Stainless steel
Cement: Aluminous, hot cured
