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| Figure A-1 a Ball and socket type suspension insulator. |

| Figure A-1 b Pin-type insulator. |

Table A-1 Polymer insulation weight advantage

Product

Type

Voltage (kV)

Porcelain Weight (lbs)

Polymer Weight (lbs)

Percent Weight Reduction

| Insulator |

Distribution

15

9.5

2.4

74.7

| Arrester |

Distribution

15

6.0

3.8

36.7

| Post Insulator |

Transmission

69

82.5

27.2

67.0

| Suspension |

Transmission

138

119.0

8.0

93.2

| Intermediate |

| Arrester |

Substation

69

124.0

28.0

77.4

Station Arrester

Substation

138

280.0

98.9

64.7

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