Bracket, Pole Top for Post Type Insulators (5-53Supp20-23)

SUPPLEMENTAL CATALOG BULLETIN 5-53.20 June 2008 Revised May 2013

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

Minimum Ultimate Bending Moment at Base 20,000 in-lbs 30,000 in-lbs 40,000 in-lbs 50,000 in-lbs 60,000 in-lbs

Accepts Insulator Stud Dia.

Accepts Mounting Bolt Dia.

Top Plate (width x depth)

Approx. Ship Wt. Each

Catalog Number

Dim. A

Dim. B

Dim. C

Dim. D

Dim. E

IB2 IB3 IB5 IB6 IB4*

5" 8" 8" 8" 8"

N/A

10 3/4"

1"

4.2 lbs. 6.2 lbs. 7.0 lbs 9.8 lbs. 11.9 lbs.

5/8"

3 3/4" Sq.

5 1/4" 5 1/4" 5 1/2" 5 3/4"

13"

1 1/2"

5"

5/8" or 3/4"

13 3/4"

1"

4" x 3 3/4"

5/8" or 3/4"

14" 15"

1 1/4" 1 1/2"

4" Sq.

6"

4 1/2" Sq.

* 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.

Maximum Lateral Force at Top of Insulator for Insulator Heights Shown

Minimum Ultimate Bending Moment at Base

Catalog Number

6"

8"

10"

12"

14"

16"

18"

IB2 IB3 IB4 IB5 IB6

20,000 in-lbs 30,000 in-lbs 40,000 in-lbs 50,000 in-lbs 60,000 in-lbs

3333 lbs. 5,000 lbs 6,667 lbs. 8,333 lbs. 10,000 lbs.

2,500 lbs. 3, 750 lbs. 5, 000 lbs. 6, 250 lbs. 7,500 lbs.

2,000 lbs. 3,000 lbs. 4,000 lbs. 5,000 lbs. 6,000 lbs.

1,667 lbs. 2,500 lbs. 3,333 lbs. 4,167 lbs. 5,000 lbs.

1,429 lbs. 2,143 lbs. 2,857 lbs. 3,571 lbs. 4,286 lbs.

1,250 lbs. 1,111 lbs. 1,875 lbs. 1,667 lbs. 2,500 lbs. 2,222 lbs. 3,125 lbs. 2,778 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.

E

C

C

D

D

A

A

B

IB2

IB3, IB4, IB5, IB6

Typical Side View

® NOTE: Because Hubbell has a policy of continuous product improvement, we reserve the right to change design and specifications without notice. 210 N. Allen St. • Centralia, MO 65240 ®

© 2008 & 2012 Hubbell Incorporated                           Printed in USA

POWER SYSTEMS, INC.

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