Jones Stephens E09050 Instructions D'installation

PVC Fittings
PVC Expansion Fittings
E09050, E09075, E09100,
E09125, E09150, E09200
PVC expansion fittings allow for expansion and contraction of
conduit, while protecting from conduit bowing, distorted boxes,
and broken couplings or fittings.
Usually expansion fittings are used in aboveground installations
when the straight run length is greater than 25 feet and the
temperature change is greater than 60°F.
Changes in conduit temperature outdoors can exceed 140°F,
with summer heat and winter cold. This means a 100 foot run of
conduit could change approximately 6 inches in length. When
expansion fittings are installed outside in the sun, add 30°F to
the air temperature change to account for absorption of the sun's
heat.
Although expansion fittings generally are not used in inside
installations, attics are a common area where expansion fittings
are required.
Pre-Installation Instructions
• Determine the expansion allowance needed for your
installation, based upon the run length and the expected
temperature change, to choose the correct fitting(s). Use the
chart to the right.
• Determine where and how many expansion fittings to
install.
• For example, if one expansion fitting is needed between
two boxes, the barrel of the fitting must be securely
fastened close to one box. The conduit must be fastened
loosely so as to allow for movement during expansion
and contraction.
• If there is more than one expansion fitting used, then
fittings are installed at the boxes with the center of the
conduit run rigidly fixed. With two expansion fittings
utilized, the center of the conduit must be fixed so as to
properly proportion expansion or contraction between
the two fittings. Otherwise, the expansion or contraction
would only occur at the free fitting, while the tighter
fitting would not move.
• In a very long run, two or more fittings should be placed
in series with one another. The barrels of each expansion
fitting must be anchored so as to allow each length of
conduit to expand or contract freely. Each section acts
independently.
The most common mistake made is not using enough
expansion fittings.
800.355.6637
jonesstephens.com
Installation Instructions – English
Inches of Expansion Allowance Needed
Length
for Temperature Changes of:
of Run
(Feet)
60°F 80°F
25
5 / 3 /
8 4
50 1 1 / 1 5 /
4 8
3
75 1 3 / 2 /
4 8
100 2 3 / 3 1 /
8 8
125 3 4
150 3 5 / 4 3 /
8 4
One Expansion Fitting
Expansion tting barrel xed rigid
Two Expansion Fittings
Run conduit through loose support
Both expansion tting barrels xed rigid
100°F 120°F 140°F
1 1 1 / 1
4
2 2 3 / 2
8
3 3 1 / 4
2
4 4 3 / 5
4
5 6
6 7 1 / 8
8
Run conduit through loose support
©2023 Jones Stephens | 02698-07 | 8-11-2023
3 /
8
3 /
4
1 /
8
1 /
2
7
1 /
4