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Poles, from which these buildings get their name, are natural shaped or round wooden timbers 4 to 12 inches (100 to 300 mm) in diameter. [4] The structural frame of a pole building is made of tree trunks, utility poles, engineered lumber or chemically pressure-treated squared timbers which may be buried in the ground or anchored to a concrete slab.
A utility pole, commonly referred to as a transmission pole, telephone pole, telecommunication pole, power pole, hydro pole, telegraph pole, or telegraph post, is a column or post used to support overhead power lines and various other public utilities, such as electrical cable, fiber optic cable, and related equipment such as transformers and ...
Building framing is divided into two broad categories, [2] heavy-frame construction (heavy framing) if the vertical supports are few and heavy such as in timber framing, pole building framing, or steel framing; or light-frame construction (light-framing) if the supports are more numerous and smaller, such as balloon, platform, light-steel ...
The service drop provides the building with two 120 V lines of opposite phase, so 240 V can be obtained by connecting a load between the two 120 V conductors, while 120 V loads are connected between either of the two 120 V lines and the neutral line. 240 V circuits are used for high-demand devices, such as air conditioners, water heaters ...
Railroad signal power supply transformer (CP-SLOPE interlocking) in west of Altoona with a warning label indicating that it contains PCBs.. Distribution transformers are normally located at a service drop, where wires run from a utility pole or underground power lines to a customer's premises.
In 2002 the building of the highest overhead line commenced in China, the Yangtze River Crossing, its two 346.5 m (1,137 ft) high suspension towers beginning service in 2004. [ 21 ] In the 21st century, replacing steel with carbon fiber cores ( advanced reconductoring ) became a way for utilities to increase transmission capacity without ...