Expansion joints should be installed to allow for the anticipated temperature change. For direct sunlight exposure, add 30°F to ambient air temperature change. Where installed inside buildings, the conduit temperature is the ambient air temperature plus the heat contributed by the conductors inside the conduit. Generally, expansion joints are not
XJG rigid/IMC expansion couplings Applications: XJG expansion couplings are used with rigid metal conduit and IMC: • To couple together two sections of conduit subject to longitudinal movement • In conduit runs to prevent damage to conduit supports such as in a building or on a bridge • Indoors or outdoors in long conduit runs
Aug 23, 2018 · the movement of the conduit will coincide with the expansion and contraction of the concrete. The only place where an expansion fitting would be utilized is where the concrete itself has an expansion joint.
Proper functioning of an expansion joint depends on three procedures: 1. The correct placement of the expansion joint. 2. The proper installation of rigid PVC conduit and the expansion joint. 3. The proper placement and fastening of support straps. One Expansion Joint - Figure 1 If only one expansion joint is needed between two boxes, the ...
Couplings have the equivalent of weather-tight joints for use with heavywall conduit. Metallic packing ring to insure the entire conduit system remains a continuous electrical conductor. Copper Bonding Jumpers are available to provide additional effective metallic bond to each conduit run.
CARLON 1-1/2-in Schedule 40 Schedule 80 Plastic Raintight Expansion …
The Carlon 1-1/2 in. Sch. 40 Expansion fitting is designed to compensate for length changes due to temperature variations in exposed conduit runs. It is crafted with Sch. 40 PVC for durability and features a 2-piece molded design and lubricated seals for easy mobility.
Expansion fittings are used in aboveground installations where temperature changes are anticipated to exceed 25°F (14°C). Expansion fittings are usually used where the straight run length is greater than 25 feet and expected temperature change is greater than 60°F. Rigid PVC conduit has a coefficient of expansion of 3.38 x 10-5 in./in./°F.
When to use PVC conduit expansion joints? | Information by …
Jul 5, 2015 · A run with a fixed box on each end needs to have an expansion fitting if expected movement is more then 1/4 inch according to NEC. A run of the same length with an elbow on each end may not need an expansion fitting at all because the ends are free to move.
3/4 Inch XJG Expansion Joint (8 Inch Movement) | Plasti-Bond
PVC coated XJG type expansion joints are used to connect two lengths of conduit subject to longitudinal movement, including that caused in long runs by thermal expansion and contraction.
DEFLECTION EXPANSION FITTINGS DF-100 Applications DF Series Deflection Fittings compensate any directional movement between two conduit joints. These fittings can withstand sporadic vibrations channeled by rotating equipment or vehicular traffic. The DF Series allows for a ¾” contraction and extension movement as well as a 30° angular
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