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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.JPG


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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.JPG


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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.JPG


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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.jpg


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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.JPG


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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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