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Home › Products › Pole Line Hardware › Insulator Hardware › Brackets › Bracket, Pole Top

Bracket, Pole Top

For mounting Post Type Insulators in Pole Top position

  • Five duty sizes
  • Simplified ratings

Features

  • For use on wood, steel, composite or concrete poles.
  • Open neck for wrench movement.
  • Open bottom slot facilitates installation or removal of bracket.
  • Offset mounting surface for insulator clearance.

Material

  • Ductile Iron per ASTM A-536.
  • Galvanized per ASM A-153.
Catalog
Number		 Minimum
Ultimate
Bending
Moment at
Base		 Accepts
Insulator
Stud Dia.		 Accepts
Mounting
Bolt Dia.		 Dim.
A		 Dim.
B		 Dim.
C		 Dim.
D		 Dim.
E		 Top Plate
(width x depth)		 Approx.
Ship Wt.
Each
IB2 20,000 in-lbs. 5/8" or 3/4" 5/8" 5" N/A 5" 10-3/4" 1" 3-3/4" 4.2 lbs.
IB3 30,000 in-lbs. 5/8" or 3/4" 8" 5-1/4" 13" 1-1/2" 6.2 lbs.
IB4* 40,000 in-lbs. 8" 5-1/4" 13-3/4" 1" 4" x 3-3/4" 7.0 lbs.
IB5 50,000 in-lbs. 8" 5-1/2" 14" 1-1/4" 4" Sq. 9.8 lbs.
IB6 60,000 in-lbs. 8" 5-3/4" 6" 15" 1-1/2" 4-1/2" 11.9 lbs.
  • * RUS Listed, eb - Bracket, pole top

 

Performance Information

The installed rating of pole top brackets is dependent on insulator height.
To calculate this rating, divide the given Minimum Ultimate Bending Moment at Base by the given insulator height.
The table below is a reference for various insulator heights.

Catalog
Number		 Minimum
Ultimate
Bending
Moment at
Base		 Maximum Lateral Force at Top of Insulator for Insulator Heights Shown
6" 8" 10" 12" 14" 16" 18"
IB2 20,000 in-lbs. 3,333 lbs. 2.500 lbs. 2,000 lbs. 1,667 lbs. 1,429 lbs. 1,250 lbs. 1,111 lbs.
IB3 30,000 in-lbs. 5000 lbs. 3,750 lbs. 3,000 lbs. 2,500 lbs. 2,143 lbs. 1,875 lbs. 1,667 lbs.
IB4 40,000 in-lbs. 6,667 lbs. 5,000 lbs. 4,000 lbs. 3,333 lbs. 2,857 lbs. 2,500 lbs. 2,222 lbs.
IB5 50,000 in-lbs. 8,333 lbs. 6,250 lbs. 5,000 lbs. 4,167 lbs. 3,571 lbs. 3,125 lbs. 2,778 lbs.
IB6 60,000 in-lbs. 10,000 lbs. 7,500 lbs. 6,000 lbs. 5,000 lbs. 4,286 lbs. 3,750 lbs. 3,333 lbs.
  • The above ratings are for ultimate load. Users should apply their desired factor of safety to arrive at typical working loads.

 

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