Transformers are UL- and CUL-listed for use with lighting fixtures. These transformers are for use with 120/240 VAC/60 Hz input. The 24/12 volt secondary outputs are protected by inherent resetable breakers. The appropriate transformer can easily be determined by multiplying the number of lamps by the watts per lamp. For larger transformers (ODX-750S, ODC-750S, ODX-1000 and ODX-1200X), consideration should be given to the maximum capacity of each fused output. Capacities shown are conservative underestimates by approximately 10%.