Line Post Insulators



Catalog No. P57-1G P57-2G P57-3G P57-11G P57-12G P57-21G P57-22G
Dimensions (inches)
Leakage Distance 7 11-1/2 14-1/2 14″ 22″ 14″ 22″
Dry Arcing Distance 4.5 7.8 7.8 6-1/4 9-1/2 6-1/4 9-1/2
Height of Middle of Single Cap Screw —- —- —- 10 13 10-1/8 13-1/8
Diameter —- —- —- 6-1/2 6-1/2 6-1/2 6-1/2
Mechanical Values (Ibs.)
Cantilever Strength* 2,800 2,800 2,800 2,800 Ibs 2,800 Ibs 2,800 Ibs 2,800 Ibs
Cantilever Strength* —- —- —- 1120 Ibs 1120 Ibs 1120 Ibs 1120 Ibs
Electrical Values (kV)
Usual Line Voltage 25 35 45 25 kV 35 kV 25 kV 35 kV
Low Frequency Dry Flashover 80 110 125 80 kV 110 kV 80 kV 110 kV
Low Frequency Wet Flashover 60 85 100 60 kV 85 kV 70 kV 80 kV
Impulse Flashover, Positive 130 180 210 130 kV 180 kV 130 kV 180 kV
Impulse Flashover, Negative 155 205 260 155 kV 205 kV 155 kV 205 kV
Radio Influence Voltage Data
Test Voltage Weight Per Unit 15 22 30 16 kV 25 kV 15 kV 22 kV
Maximum RIV at 1000 kHz (┬ÁV) 100 100 100 100 kV 100 kV 100 kV 100 kV
Packing & Shipping Data
Minimum Net Weight 14.3 19.1 26.3 16 Ibs 25 Ibs 15 Ibs 21 Ibs
Packed Weight Per Unit 17.6 23.9 30.6 19 Lbs 27 Lbs 18 Lbs 25 Lbs
Standard Package Quantity 4 3 2 3 2 2 2
Insulator Coatings
Gray Glaze —- —- —- Standard Standard Standard Standard

*rus accepted

Gray Glaze is standard.


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