Multi-Fittings One Piece Expansion Joints Installation Manual
One Piece
Expansion Joints
• The perfect expansion fitting for short runs of PVC
•
1
/2" - 2"
• Molded one piece construction
• Nitrile O-ring for smooth functioning
• One Kraloy One Piece Expansion Joint (OPEJ) controls
1
1
/4" of thermal expansion or contraction on a 30 foot
conduit run (or less) regardless of the temeprature at the
time of installation.
Dimension Part Product Std. Wgt/Pkg
(in) Number Code Pkg. (lbs)
1
/2 OPEJ05 078240 80 6
3
/4 OPEJ07 078209 50 5
1 OPEJ10 078208 40 5.5
11/
4 OPEJ12 078204 25 5
1
1
/
2 OPEJ15 078045 15 4
2 OPEJ20 078388 10 4
E 59258
Kraloy Customer Service Center
Toll Free: 1-800-265-1815 Direct: 519-681-2140 Fax: 519-681-2156 www.kraloyfittings.com
Dimension A 2 3 Overall
(in) Dia. Length Length Length
1
/2 1.102 0.660 2.465 3.25
3
/4 1.314 0.729 2.646 3.50
1 1.610 0.885 2.725 3.75
1
1
/4 1.987 0.950 2.895 4.00
1
1
/2 2.208 1.075 3.030 4.25
2 2.701 1.140 3.206 4.50
AB
Installation
The 2002 NEC Code (352.44) specifies:
Expansion fittings for Rigid Nonmetallic
Conduit shall be provided to compensate
for thermal expansion and contraction
where the length change is expected to
be ¼” or greater in a straight line
between securely mounted items such
as boxes, cabinets, elbows or other
conduit terminations.
Graph 1 illustrates when expansion fittings
are required based on the length of the
conduit run and the expected temperature
change.
As a general rule 100 feet of PVC conduit
will undergo a change in length of 4” for
every 100°F temperature change.
On a 30 foot run of PVC conduit or less a
single One Piece Expansion Joint fitting will
control 11/4" of expansion or contraction
regardless of the ambient temperature at
time of installation. For long conduit runs
the use of Kraloy EJ series expansion joints
is recommended.
Installing the One Piece
Expansion Joint (OPEJ):
1. Solvent cement the PVC conduit into
the conduit hub of the OPEJ and firmly
secure the PVC conduit on the solvent
cement side of the OPEJ using Kraloy
pipe straps.
2. Set the expansion fitting by marking a
line 11/2" from the end of the conduit to
be inserted and insert the conduit into
the OPEJ to this mark.
3. Secure and support the conduit
raceway using Kraloy pipe straps.
Note:
Expansion fittings are not required when the
conduit is embedded in concrete or direct earth buried.
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
Expected Temperature Change (∆) ˚F
Length of Conduit Run (FT)
The shaded area represents where an expansion fitting is required
based on the length of the run and the expected temperture changes.
i.e. 40' conduit run & temperature ∆ 40˚F exp. fitting is required
i.e. 30' conduit run & temperature ∆ 20˚F exp. fitting not required.
X
X
Line indicates the
point at which 1/4"
of expansion or
contraction will occur.
Graph 1
© 2002 Kraloy
PIELRPKR020305
OAL
23
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