It is like PVC pipes, but it does not contain any recycled components or materials. It is of better quality than the previous pipes, but it is more expensive.
Usage: – When buried in concrete ceilings or embedded walls
– When buried under the ground Under Final Finished Floor
There are all sizes and diameters, including small pipes, such as those used in the extensions of ceilings and walls, and large ones that are used in road and asphalt encroachments.
EMT Pipe Fittings
(Electrical Metallic Tube)
– This type of pipe is used in extensions visible above fallen or suspended ceilings
exposed installations over false ceilings
It is also used under Raised Floors
These pipes can be bent at angles and change direction
– It can be considered (exposed unseen), that is, pipes that are extended, exposed, that is, not buried, but they cannot be seen because they are used above the fallen ceiling or under the floors.
Note: Single core cables should not be extended inside EMT pipes (metal pipes) because the magnetic field emanating from the cable will cut the metal pipes, which will produce eddy currents in the pipes, causing the pipes to heat up and may lead to overheating or burning of the cable (as for multi-phase cables). cores, the resultant magnetic field arising from the three phases will be equal to zero, so eddy currents do not result from them.
IMC Pipes
(Intermediate Metallic Conduit)
They are very similar to EMT pipes, but they are more rigid, so they cannot be bent, so ready-made elbows are used
– It can be considered (exposed seen), that is, it is extended, exposed, that is, it is not buried, but it can be seen in offices and workplaces.
RGS Pipes
(Rigid Galvanized Steel)
It is a pipe that is resistant to rust and chemical reactions, so it is widely used in places where gases are abundant and in places close to water. It is considered the most expensive type of pipe.
It is used on suspended ceilings and in extensions in electrical and mechanical rooms, some laboratories, bathrooms, and wet areas.
Filling Ratio for Conduits (according to NEC code)
Fullness coefficient: It is a coefficient that expresses the ratio between the sum of the areas of the cable sections to the sectional area of the pipe containing them
For one conductor (or cable) : Filling Ratio = 53%
For two conductors (or cables) : Filling Ratio = 31%
For more than two conductors (or cables) : Filling Ratio = 40%
Calculate the appropriate conduit size according to the cable section
Example: If we have three copper cables with a cross-sectional area of (16 * 4 mm2), what is the appropriate pipe size for these cables?
Solution: Since the number of cables is more than (2), according to the above, the fullness coefficient should be equal to (40%).
Filling Ratio = 40%
This means that
C.S.A of cables = 40% C.S.A of Conduit
(π * (D2 / 4) = 0.4 * (d2/ 4
d2 = 0.4 * d2
d = 1.58 * D
where d = diameter of Conduit
D = sum of diameters of Cables
From the catalog of the cable manufacturer (the Swedish company, for example), we can find the outer diameter of the cable (16 * 4 mm2)
From the catalog, we find that the outer diameter of the cable (16 * 4 mm2) is equal to (19.6 mm2).
We find that D = 3 * 19.6 = 58.8 mm
So d = 1.58 * D
= 1.85 * 58.8 = 92.9 mm
We find that the nearest pipe diameter is 110 mm, or 4 inches
Conduit Fittings
These accessories are found in both plastic and metal pipes
Couplers bushing
It is used to connect two pipes to each other in a straight line
Reducers
It is used to connect two pipes (of two different diameters) to each other in a straight line
Elbow elbow
Used to connect two perpendicular pipes (90 degrees)
Crank cross link
It is used to connect two pipes with an obstacle between them (beams, for example) or to cross the intersections of other pipes
Male/Female Adapter
Used to connect the pipe with a box or a boat
Aviz Saddle
It is used to fix pipes to walls or ceilings
Ceiling Boxes
They are boxes that are installed on the ceiling, and in which the wire connections feeding the lighting fixtures are implemented
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What are the features of Jazli ?
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