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8/10/2019 conduit fittings and supports.pdf
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Guy Grip Dead EndHigh Strength. We manufacture. Line Fittings. Anti-corrosion.
2Conduit Fittings and Supports
In Article " Types of Electrical Conduits", I explained the following points:
Definition of An electrical conduit,
Advantages of using Electrical conduits than other wiring methods,
Disadvantages of using Electrical conduits,
How to Verify Correct Installation of Conduit,
Types of Conduit.
Today, I will explain Conduit Fittings and Supportsas follows.
Conduit Fittings and Supports
Types of Conduit Fittings and Supports
There are many types of conduit fittings, made in different sizes and shapes. The type
of conduit fitting used will depend upon the particular need. These conduit fittings
can be listed as follows:
1. Conduit bodies and covers
2. Conduit Bends,
3. Conduit Coupling,
4. Conduit Bushing,
5. Conduit Union,
6. Reducing washers,
7. Conduit nipples,
8. Conduit straps,
9. Conduit clamps.
1 Conduit Bodies And Covers
Conduit bodies are tubular hardware units with openings at each end to admit EMC
conduit and cavities that are large enough to give the installer access to the ends of wires
or cables so they can be pulled out and easily be redirected if necessary. (see Figure 1).
These bodies are available in different sizes and are made to perform such functions as
joining two sections of conduit to form either straight lengths or 90 bends.
Conduit bodies have threaded ports or openings for conduit and tapped holes for the
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screws to fasten the covers over the cavities to form watertight seals when wire or cable
arrangement is complete.
Conduit bodies are especially useful for making rightangle bends in stiff, heavy conductor
bundles or cable such as service entrance (SE) cable. For this reason they are widely used
in making service entrance connections.
Conduit bodies are standard commercial hardware items made from malleable iron or
copperfree aluminum. The iron bodies can be galvanized or painted with enamel to
prevent rusting.
Conduit bodies must be durably and legibly marked with their volumes by the
manufacturer to be approved for containing splices, taps, or other devices.
Figure 1. Conduit Bodies And Covers
2 Conduit Bends
Do not damage the tubing or effectively reduce the internal diameter when bending
conduit. Use a hand or mechanical bender for sizes up to 11/2 inch. Use a hydraulic
bender for bends of sizes larger than 11/2 inch.
Make sure there are no more than four quarter bends (360 degrees) between pull points
per the National Electrical Code. This includes the offsets located next to the box or
enclosure.
Ensure that the radius of the curve of the inner edge of any field bend meets the
requirements in Table 34610 of the NEC.
Factory bends:
It referred to as elbows, are manufactured to a specific angle. They are short lengths of
conduit threaded on both ends and commonly made in 90 and 45degree angles as shown
in Figure 2. Factory bends range in size from 1/2 inch to 6 inches.
Figure 2. Factory Bends (Elbows)
http://3.bp.blogspot.com/-V8ms2IFHqZw/Ua8Wy7rBEJI/AAAAAAAAIaI/15J8sIie5f0/s1600/conduit+body.jpghttp://1.bp.blogspot.com/-v9Y3bIJeBHM/Ua8XHDrqZKI/AAAAAAAAIaQ/CiPNvr2XcZY/s1600/Factory+Bends.JPG8/10/2019 conduit fittings and supports.pdf
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3 Conduit Coupling
When two lengths of conduit connect, a coupling joins them. Figure 3shows a rigid conduit
coupling. The coupling is threaded on the inside and made in different sizes.
Figure 3. A Rigid Conduit Coupling
4 Conduit Bushing
A locknut fitting (Figure 4) screws onto conduit connecting it to an enclosure. A bushing (Figure 4)
provides protection for conductors leaving the conduit opening.
Figure 4. A Locknut and a Bushing
Figure 5shows the application of both the locknut and the bushing. Two locknuts connect a piece of
conduit to a punched enclosure. The locknuts are tightened on both sides to secure the conduit. The
bushing screws on to the end of the conduit and protects the wires from damage as they are pulled
through the conduit.
http://2.bp.blogspot.com/-jJZTchTllMI/Ua8Xh_k4vNI/AAAAAAAAIag/JJ2jhuF8dh0/s1600/Locknut+and+a+Bushing.JPGhttp://3.bp.blogspot.com/-O3sOxkO7xcY/Ua8XT43_zHI/AAAAAAAAIaY/6XoQogmJWwk/s1600/Rigid+Conduit+Coupling.JPG8/10/2019 conduit fittings and supports.pdf
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Figure 5. The Application of a Locknut and a Bushing
5 Conduit Union
The conduit union (Figure 6) connects two sections of rigid conduit when neither section can
physically turn. The union is a conduit coupling used for emergency repair work and in difficult
places near corners, walls, or ceilings. The two types shown are a union with two female hubs (UNF)
and a union with a male and female hub (UNY).
Figure 6. Two Types of Rigid Conduit Union
6 Reducing washers
Reducing washers connect smaller diameter conduit to larger boxes and enclosure holes. Threaded
reducers connect smaller conduit to larger conduit fittings. Figure 7shows how a threaded reducer
and a reducing washer work.
http://4.bp.blogspot.com/-wnDJXUkqmDg/Ua8YKqfnJvI/AAAAAAAAIa4/ChV5jxpcZ-o/s1600/Reducing+Fittings.JPGhttp://1.bp.blogspot.com/-uOy4fm_s4xU/Ua8X9JHo2_I/AAAAAAAAIaw/073Jvqo10v8/s1600/Rigid+Conduit+Union.JPGhttp://3.bp.blogspot.com/-hAGmYMeKaHA/Ua8XuQ2nrMI/AAAAAAAAIao/LtPtDHfXuOY/s1600/The+Application+of+a+Locknut+and+a+Bushing.JPG8/10/2019 conduit fittings and supports.pdf
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Figure 7. Reducing Fittings
7 Conduit nipples
Conduit nipples (see Figure 8) protect wiring between two enclosures
mounted close together. Nipples are threaded on both ends and vary in
size and length. A conduit nipple is specified by Chapter 9 of the NEC, Note
4 to Tables, as having a maximum length of 24 inches. The nipple may be
filled to 60% of its total crosssectional area, and the adjustment factors of
Section 31015(b)(2)(a) need not apply.
If nipples exceed the 24 inch maximum, the system becomes a raceway and
only three currentcarrying conductors are permitted in a raceway without
applying the derating factors. The 40% fill rule would also apply.
Manufactured nipples come in three classifications, the close, short, and
long nipple. They vary in length from 11/8 in. to 8 inches. Any length
beyond 8 inches is made by the installer.
Figure 8. Conduit Nipple
8 Conduit straps
Conduit straps mount against the conduit to fasten it in place (Figure 9). Straps fasten to the wall
or ceiling with screws or bolts. Straps are support fitting.
Figure 9. Conduit Straps
http://4.bp.blogspot.com/-5sv8AIcSdCI/Ua8Yg-dJ58I/AAAAAAAAIbA/7Ek__zppb4g/s1600/One-hole+Conduit+Strap.JPGhttp://3.bp.blogspot.com/-sm1IkGS8kDU/Ua8ZwWhRf2I/AAAAAAAAIbc/qGi-jF1b6TU/s1600/conduit+nipple.jpg8/10/2019 conduit fittings and supports.pdf
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9 Conduit clamps
Conduit clamps are used to fasten conduit to fixed structures. They are considered support fittings.
See Figure 10.
Figure 10. Conduit Clamps
Notes for Conduit Supporting
Rigid metallic conduit and electrical metallic tubing both require support. Conduit should
be fastened by straps to the ceiling or wall, or supported on hangers from the ceiling at
least every 10 feet (Figure 11). Conduit should be fastened within 3 feet of a box (5 feet
of unbroken lengths are allowed if structural members do not permit fastening within 3
feet).
Rigid conduit installed in straight runs are permitted to use Table 34612(b)(2).
Liquidtight flexible conduit must be fastened in place by an approved means within 12
inches of each box, cabinet, conduit body, etc. and must be supported and secured at
intervals not to exceed 4.5 feet.
There are exceptions to the above rules and these can be located under the various
support headings in the individual articles of the Code.
Figure 11. Rigid Conduit Minimum Support Requirements
Other guidelines for the placement of conduit straps should be located as follows:
1. One strap is placed on each side of every device or box.
2. One strap is installed before and after each bend.
3. One strap is installed before each offset.
http://4.bp.blogspot.com/-aw8nLbk11VI/Ua8ZCKjgl1I/AAAAAAAAIbQ/m9vKYjBn8ZA/s1600/Rigid+Conduit+Minimum+Support+Requirements.JPGhttp://1.bp.blogspot.com/-AnxdRoJLVK0/Ua8YsSoz0WI/AAAAAAAAIbI/nhq5TU52hhc/s1600/Conduit+Clamps.JPG8/10/2019 conduit fittings and supports.pdf
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2 comments:
Reyami Electrical June 23, 2013 at 3:22 AM
Nice and very informative post. Conduits are the very major part of electrical fittings. Thanks for sharing the post, and giving
information about d ifferent types of conduits.
For Electrical Fitting in Dubai visit : Electrical Fittings in Dubai
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simi kaur August 6, 2014 at 10:04 AM
Really a great blog with a best thoughts and ideas are shared about electric fitting. Thanks for sharing such an interesting
article.
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