HOLD12102 – Double
HOLD12202 – Double
HOLD12002 – Double
HOLD12302 – Double
HOLD12402 – Double
We have learned from experience that poles supporting certain types of post-top mounted fixtures are more susceptible to first and second mode vibration. The rectangular or “shoebox” shaped luminaires, for example, seem to encourage second mode vibration, while more aerodynamic lightweight fixtures encourage first mode vibration. Any oscillation should be dealt with as soon as it becomes apparent to prevent damage to the pole or luminaire.
To minimize the effects of first or second mode vibration, Hapco has developed dampers which very effectively quell wind induced vibration of lighting poles.
Free Vibration of Test Pole with No Added Damping
Free Vibration of Test Pole with Impact Damper
Hapco’s patented First Mode Vibration Damper is field installed at the top of square poles. This damper very effectively reduces first mode vibration of square lighting poles. Due to potential vibration fatigue issues that can be associated with moderate wind conditions, First Mode Dampers are recommended for square poles with mounting heights greater than 25’ and for square poles with light loading fixtures less than 2.0 EPA. Fatigue related pole failures are not an indication of substandard material, workmanship or design of the pole and is not covered under Hapco’s standard warranty.
*Contact factory for First Mode Dampers for use on round poles.
U.S. Patent No. 7871186
The Hapco Second Mode Damper was awarded the industry’s first patent in the vibration damping category in 1972. It is attached to the pole at approximately the midpoint of the pole, and can be factory bolted inside the pole or field mounted on the inside or outside of an existing pole.
Based on past experience, some Hapco poles include factory-installed Second Mode Vibration Dampers as a standard component. If the poles you intend to order are to be bridge mounted, used as camera poles, or may be subject to unusual site conditions, wide open terrain, steady or high energy prevailing winds, or other site conditions as mentioned, please make Hapco aware of these conditions. Or, if your installed poles are exhibiting oscillation, contact Hapco to pursue a damping solution that may include installing a Hapco Second Mode Damper on the poles.
Catalog No. 53185
Banded to Shaft
Catalog No. 53373
Bolded Inside Shaft
Catalog No. 53884
Bolded Inside Shaft
Standard handhole modifications are detailed below.
Custom reinforced handhole options may be available
(contact Hapco for additional information).
4″ x 6″ Reinforced Handhole
4″ x 8″ Reinforced Handhole
3″ x 5″ Reinforced Handhole
4″ x 7″ Reinforced Handhole
4″ x 9″ Reinforced Handhole
5″ x 9″ Reinforced Handhole
Standard unreinforced handhole modifications. Custom unreinforced handhole options may be available (contact Hapco for additional information).
3″ X 5″ Unreinforced Handhole
2″ x 4″ Unreinforced Handhole
Receptacle Outlet Box Only
Receptacle Outlet Box
With Duplex G.F.C.I. Receptacle
Tenons are available for luminaires which cannot be used with the standard Hapco 2″ pipe-size tenon. The 1 1/4″ pipe-size tenon is 6″ long and is welded into the end of the bracket arm with a circumferential weld. Custom tenon options are available (contact Hapco for additional information).
1-1/4” Pipe-Size Slipfitter Tenon
Street Sign Bracket
Spun covers cannot be used in breakaway designed poles.
SBC26002 Two Piece base covers are constructed of aluminum. Covers are available for every size of base flange.
SBC25002 – Two Piece
Spun Base Cover – Round Poles
Base Cover – Square Poles