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in external appearance resembles its close relative, liquid-tight flexible nonmetallic conduit. Both have smooth grey outer jackets that are liquid tight. Type Liquid Tight Flexible Nonmetallic Conduit has an internal steel shield, which makes it more powerful and much less at risk to kinking. Either of these raceways can be created in mild curves to change instructions and also to stay clear of challenges. Additionally, the versatility works for ending at motors where there is likely to be heavy vibration.
Use, installation, and construction specifications are found in NEC Short article 350, together with the critical Uses Permitted and also Uses Not Permitted. Liquid-tight flexible metal conduit is specified as a raceway of a round cross-section having an external liquid-tight, nonmetallic, sunlight-resistant jacket over an internal versatile metal sheath with linked combinings, connectors, and also installations for the installation of electric conductors.
is allowed to be used in exposed or hidden locations where adaptability or protection from liquids, vapors or solids is required. It is permitted in specified unsafe (classified) places and also it may be used for direct interment where detailed and marked for the purpose.
Liquid-tight flexible metal conduit is not to be used where subject to physical damage.
There are some dimension limitations. Liquid-tight flexible metal conduit smaller sized than statistics designator 16 (trade dimension 1/2) is not to be utilized. However, an exemption permits metric designator 12 (trade size 3/8) for enclosing motor leads. The optimum dimension of Liquid-Tight Flexible Metal Conduit allowed is metric designator 103 (trade dimension 4).
The optimum number of bends is not to be a lot more that the equivalent of four quarter bends between pull factors. Subject to exemptions, liquid-tight adaptable steel conduit is to be safely secured in place within 12 in. of boxes, as well as protected at periods not over 4 1/2 ft.
If liquid-tight flexible metal conduit is used to minimize resonance to or supply flexibility for relocating tools, an equipment-grounding conductor must be provided. Or else, the internal metal sheath will certainly be adequate.
. Where suitable, it contributes to an attractive appearance in commercial and also commercial job and also operates well in domestic settings for powering water pumps and also fixed devices where there is ambient wetness in addition to resonance.
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