Suspension Porcelain Insulators Normal Type-4

Fig

1

1

1

2

Class

U100BL

U120B

U125BS

U125BL

Unit spacing (H) mm

146

146

146

178

Nominal diameter (D) mm

255/280

255

255

280/292

Nominal Creepage Distance (mm)

295/340

295/320

295

324/356

Rated E&M failing load (kN)

100

120

125

125

Routine tensile load (kN)

50

60

62.5

62.5

Coupling size

16A/16B

16A/16B

20

20

Impact strength (n.m)

7

7

7

7

Power frequency withstand voltage

Wet (kv)

40

40

40

40

Dry (kv)

70

70

70

70

Dry lighting impulse withstand voltage (kV)

100

100

100

100

Power frequency punctured voltage (kV)

110

110

110

110

Radio-Interference-

Voltage

Test Voltage to ground (kV)

10

10

10

10

Maximum RIV at 1MHz (µV)

50

50

50

50

Weight (kg)

5.75/6.1

5.75

5.8

8.0

Applicable Standard: IEC, GB, AS, BS