Connecting Vancouver and Richmond, the Knight Street Bridge is a cantilever bridge spanning the North Arm of the Fraser River. Houle upgraded the distribution and lighting for the two km bridge. The lighting is powered from four substations spread out underneath the bridge. To change out the fixtures and distribution from 277V to 347V, Houle came up with an innovative solution to perform the upgrade without having to shut off portions of the bridge lighting. This was achieved by ordering all the fixtures with tri tap ballasts and bringing the tap conductors to the base of the pole. This allowed Houle to install all the cabling and fixtures at 277V. When it came time to swap out the distribution, it was the simple task of changing the taps at the base of the pole.
Because a fair section of the bridge spans the Fraser River, there was no way to install the cables to the underside of the bridge without supporting a working platform from the bridge deck. This presented a series of challenges including supporting a platform from the bridge deck without interference to the bridges roadway; working without impeding the path of cyclists and pedestrians on the walkway; and moving the working platform that supports the lower platform (for access underneath the bridge) through the series of pole fixtures along both sides of the bridge.
By using a working platform engineered to travel down the sidewalk and split apart around the poles, Houle was able to install all cabling without having to close down traffic lanes and without having a hiab on site. Houle was also able to avoid the need for nightly lane closures on the bridge by using boom lifts from the ground to install a major portion of the cabling.