Eng
Standard Insulator
 
Product Insulator
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:: PIN-POST INSULATOR ::
Pinpost 56 / 57-2 Pinpost 56 / 57-3 Pinpost 56 / 57-4

Note: 1. All dimensions are in millimeter.
  2. Dimension not specifying tolerance are only reference.
  3. Top and side wire-groove shall seat a 50 mm diameter mandrel.
STANDARD
TISI 1251
ANSI C29.7
CLASS
56 / 57-2
CLASS
56 / 57-3
CLASS
56 / 57-4
DIMENSION Leakage distance min., mm 534 699 953
  Protected leakage distance min., mm 267 356 483
MECHANICAL VALUE Cantilever strength, kN 12.5 12.5 12.5
Cantilever proof load, kN 5 5 5
ELECTRICAL VALUE Low-frequency dry flashover,kV 110 120 140
Low-frequency wet flashover,kV 85 85 95
Critical- impulse flashover,positive,kV 180 210 225
Critical- impulse flashover,negative,kV 205 230 300
RADIO INFLUENCE
VOLTAGE DATA
Low-frequency test voltage,
rms to ground,kV
22 30 44
Maximum RIV at 1000 kHz,
Radio freed, microvolt
100 200 200
  Weight of one insulator,kg 9 11 15
Color of insulator BROWN BROWN BROWN