IMSA Roadway Lighting I case studies
IMSA Roadway Lighting I · Put your knowledge to work in context.
IMSA Roadway Lighting Technician I is one of the certification programs listed by the International Municipal Signal Association (IMSA), a professional association serving public safety and transportation infrastructure workers. IMSA describes its certifications as industry-leading credentials that "Build or validate skills," and lists Roadway Lighting alongside Work Zone Temporary Traffic Control, Traffic Signal, Signs and Markings, and Fiber Optics. The IMSA Roadway Lighting I case studies are 5 cases and about 2,578 words.
1Intersection Retrofit with Reduced Mounting Height and Glare Complaints
A city is replacing four 400 W HPS luminaires at a signalized intersection of a four-lane divided arterial and a two-lane collector. Existing poles are 10.7 m high, set 1.5 m behind the curb at each corner, with 2.4 m arms.
595 words, about 3 min2Long 120 V Lighting Run with Far-End LED Cycling
A 120 V single-phase roadway lighting circuit serves 14 LED luminaires rated 70 W at 120 V and spaced 35 m apart along a 490 m run. The conductors are 12 AWG copper, fed from a 20 A breaker at a service pedestal.
543 words, about 3 min3Coastal Pole Foundations with Groundwater and a Leaning Pole
A contractor is installing ten 9 m galvanized steel roadway lighting poles along a coastal boulevard. The geotechnical report notes loose sandy fill to 3 m, seasonal high groundwater at 0.6 m, and soil resistivity of 1,500 ohm-cm.
472 words, about 2 min4High-Mast Interchange Aiming, Glare, and Maintenance Access
A new high-mast lighting system at a rural interchange uses four 40 m poles, each with six 600 W LED luminaires at 4000 K. The design photometric plan predicted average 0.7 fc and uniformity of 4:1, with luminaires aimed 30 degrees from nadir.
480 words, about 2 min5Contactor Chattering on a Shared-Neutral Lighting Control Circuit
A 240 V single-phase roadway lighting circuit serves 18 LED luminaires through a 30 A contactor. The contactor coil is rated 120 V and is controlled by a 120 V photocell; the lighting load is 240 V line-to-line.
488 words, about 2 min