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Other common utility pole materials are aluminum, steel and concrete, with composites (such as fiberglass [citation needed]) also becoming more prevalent. [10] One particular patented utility pole variant used in Australia is the Stobie pole, made up of two vertical steel posts with a slab of concrete between them.
The poles are fireproof, rotproof, and termiteproof. Stobie poles are widely regarded in Australia to be dangerous to vehicles, with collisions sometimes "almost cutting the vehicle in half". [9] [10] [11] Stobie pole designs are calculated to ensure the installation uses a suitably sized pole.
For a single wood utility pole structure, a pole is placed in the ground, then three crossarms extend from this, either staggered or all to one side. The insulators are attached to the crossarms. For an "H"-type wood pole structure, two poles are placed in the ground, then a crossbar is placed on top of these, extending to both sides.
The SWIS reaches from Albany in the south, Kalbarri in the north and Kalgoorlie in the east of the state and includes the Perth metropolitan area. [3] The Western Power network consists of more than 103,000 km (64,001 mi) of powerlines, 825,788 poles & towers, 276,000 streetlights and 154 transmission substations.
Oppenheimer poles can still be found along the route of the former Australian Overland Telegraph Line, and in Queensland and Western Australia. Oppenheimer poles can also be found repurposed as flag poles, or in the case of the William Creek Hotel, as verandah supports. There is also an Oppenheimer pole outside the Daly Waters pub. [citation ...
Rural distribution is mostly above ground with utility poles, and suburban distribution is a mix. [1] Closer to the customer, a distribution transformer steps the primary distribution power down to a low-voltage secondary circuit, usually 120/240 V in the US for residential customers.
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In rural and undeveloped areas, services such as telephone and electricity are usually carried on utility poles or even pylons rather than underground. In Australia, manhole also commonly refers to an access hatch used to get access from a room or hallway into the ceiling cavity of a building.