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Transmi ss ion Tool s – 2250
Page 2262
September 2012
Phone: 573-682-5521 Email: hpsliterature@hubbell.com Web: hubbellpowersystems.com
H478322
T4000838
C4000445
C4000219
Catalog No.
H478322
Description
Tower Arm Yoke
Max. Load
12,000 lb.
Weight
42
1
/
2
lb./19.1 kg.
Steel Tower Yoke
• Fits over the tower arm, serving as a support for the
Chance Strain Poles
• Relieve tension on suspension insulator string
through the “hot end” yoke and conductor yoke
plate
• Yoke legs can be adjusted to fit most tower structure
configurations
• It is recommended that the design drawings of the
tower arms be submitted to Hubbell Power Systems,
Inc. with the Tower Yoke order for engineering
evaluation
• Swivel trunnions are 26” center to center
NOTE:
Yokes shown here use Adjustable Strain Poles and
small trunnions on page 2252 through 2253.
STRUCTURE YOKES
Description
Steel Arm Bracket
Max. Load
15,000 lb.
Weight
14
3
/
4
lb./6.6 kg.
Max. Load
15,000 lb.
Description
Steel Arm Yoke
Catalog No.
C4000445
Weight
15 lb./6.8 kg.
Weight
41 lb./18.5 kg.
Max. Load
12,000 lb.
Description
H-Frame Crossarm Yoke
Catalog No.
C4000219
STEEL ARM BRACKET
The steel arm bracket is used with the C4000445 (steel
arm yoke) where the steel arm is not equipped with
an end plate. The bracket is made of heat treated
aluminum and is complete with a wheel binder. The
steel arm bracket serves the same purpose as an end
plate to support the yoke assembly.
Steel Arm Yoke
• For use on the arm of a steel pole
• Mounts over a ¾”-thick end plate as shown at left
• Swivel castings in end of yoke for proper alignment of
Chance Strain Poles to conductor-end yoke
• Load rating is dependent upon the angle of end plate
on arm
• 45° is maximum angle allowed with a maximum load
of 9,000 lbs.
• In-line loading of yoke permits a maximum load of
15,000 lbs.
• Bronze pins place the strain poles 21” apart, center-to-
center
• Lifting eye is cast into the top of the yoke to assist in
rigging
Wood or H-Frame Tower Yoke
• Similar to the Steel Tower Yoke in design and
application
• Two clamp bolts which secure the yoke to the double
plank crossarms may be adjusted to three center-to-
center positions (9", 11" and 13") to fit various arm
sizes
• Vertical take-up on the crossarm is from 9" to 12"
• Swiveling trunnion brackets are located 26" center-
to-center
• Longer braces are available on special orders
Catalog No.
T4000838