A utility pole
that supports the wires for two or more companies. A typical joint pole has three types of wires: electric
power, cable television
, and telephone
. In other locations, they support such devices as signs, traffic signals, street lights, and fire and police call boxes
Working up, on one such pole, you have: Telephone cable, cable television cable, some unused space, and a stepdown transformer. A stepdown transformer is used for converting primary voltage
to secondary voltage.