Electrical power and communication lines are carried by utility power poles. Some houses have both types of wiring, while others only have one. The former is positioned above the latter for safety if the utility pole carries both power distribution and communication wires. Aluminium power distribution cables are used in overhead power lines for cost-cutting reasons. Distribution feeder lines, which transmit electricity from substations to homes, and sub-transmission lines, which connect local substations to big regional ones, are the two types of electric power lines supported by utility poles. Sub-transmission lines transmit higher voltage, which is the technical difference between the two.
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