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FMT is a raceway, but not a conduit and is described in a separate NEC Article 360. It only comes in 1/2" & 3/4" trade sizes, whereas FMC is sized 1/2" ~ 4" trade sizes. NEC 360.2 describes it as: "A raceway that is circular in cross section, flexible, metallic and liquidtight without a nonmetallic jacket."
The pipeline, finished in 1867, measured 1.5 miles in length and was in use through 1927. Bituminized pipe was not in widespread commercial use until the late 19th century when it was used exclusively as electrical conduit. [1] In 1893, Stephen Bradley, Sr. founded the Fiber Conduit Company in Orangeburg, New York.
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Common sizes are 15 mm and 22 mm. [7] Other sizes include 18 mm, 28 mm, 35 mm, 42 mm, 54 mm, 66.7 mm, 76.1 mm, and 108 mm outside diameters. Tubing in 8 mm and 10 mm outside diameters is called a "micro bore" and is easier to install, although there is a slightly increased risk of blockage from scale or debris.
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Insulated wires may be run in one of several forms between electrical devices. This may be a specialised bendable pipe, called a conduit, or one of several varieties of metal (rigid steel or aluminium) or non-metallic (PVC or HDPE) tubing. Rectangular cross-section metal or PVC wire troughs (North America) or trunking (UK) may be used if many ...
The conduit methods were known to be of better quality, but cost significantly more than K&T. [2] In 1909, flexible armored cable cost about twice as much as K&T, and conduit cost about three times the price of K&T. [6] Knob and tube wiring persisted since it allowed owners to wire a building for electricity at lower cost.
A rigid overhead rail may also be used in places where tensioning the wires is impractical, for example on moveable bridges. In modern uses, it is very common for underground sections of trams, metros, and mainline railways to use a rigid overhead wire in their tunnels, while using normal overhead wires in their above ground sections.
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