scale, you can make accurate bends. To assure easy
portabiliy, the manufacturer has designed the pipe
supports for use as rollers; and parts are made of light-
but-strong aluminum alloy whenever possible.
In the bending process, if the pipe is bent to the
correct scale reading, overbends will not result.
However: if you need to correct an overbend, you must
follow the manufacturers instructions that cover the
bender that you are using.
As mentioned earlier, bending conduit is an art. The
more you practice, the better you will be. Most bending
charts show information on how to make bends to 15°.
30°, 45°, 60°, 90°, 180° and offset bends. When degrees
of bend other than these are required and it is important
that the bend be accurate. the Bending Degree Indicator
should be used. The Bending Degree Indicator is
extremely accurate and is very easy to use. The indicator
also should be used when making segment bends to
center radii greater than those of the bending shoe.
CONDUIT SUPPORTS AND
To install conduit overhead and underground
properly, you need to review the appropriate articles of
the Code. Conduit should run as straight and direct as
possible. There should never be more than the
equivalent of four right-angle bends between outlets or
In installing exposed conduit runs where there are
several conduits in the run. it is usually better to carry the
erection of all of them together. rather than to complete
one line before starting the others. If all are carried
together. it is easier to keep all the raceways parallel.
particularly at turns. and chances are that the job will look
Conduit can be supported on surfaces with pipe
straps made in one-hole and two-hole types. On wooden
surfaces, wood screws secure the straps in position. On
masonry surfaces, machine screws that turn into lead
expansion anchors can be used. Wooden plugs should
never be used because no matter how well seasoned a
plug appears to be, it usually will dry out to some extent
and loosen in the hole. When laying out multiple-conduit
runs, you must keep in mind the spacings between the
conduits to permit proper placing of the straps. The
screw-hole dimension (see table 5-4) enables you to order
screws of the proper diameters to support the straps.
LOCATION OF CONDUIT SUPPORTS
The Code states that rigid-metal conduit will be
firmly secured within 3 feet of each outlet box,
junction box, cabinet, or fitting. The Code permits this
distance to be increased to 5 feet where structural
members do not readily permit fastening within 3 feet.
Rigid-metal conduit will be supported at least every 10
feet; except that straight runs of conduit made up of
Table 5-4.Spacings Requirements When Laying Out Multiple-Conduit Runs
Size of conduit
Size of wood screw
No. 8 × 5/8"
No. 8 × 3/4"
No. 8 × 3/4"
No. 10 × 3/4"
No. 10 × 7/8"
No. 10 × 1"
No. 10 × 1"
No. 10 × 1- 1/4"
No. 11 × 1- 1/4"