Installation Guide

34
Installation Practices
Table 4.7 Burial Depths for Underground Routing
Outdoors Minimum of 12”
In slab
1-½” minimum concrete
coverage
Under slab
No minimum burial depth
below slab, or in compliance
with local codes
Table 4.8 Conduit Termination Height for Under-
ground Routing
Indoors
Conduit to extend a minimum
of 1” above nished oor
height
Outdoors
Conduit to extend a minimum
of 4” above nished grade
Figure 4.26 Installation in Nonmetallic Conduit Under Slab
Ends of conduit do not have
to be sealed
4" Min
PVC or PE Conduit*
No minimum burial depth beneath slab except
as specied by local code
Recommended minimum bend radius: 6"
*ID of conduit should be at least 1/2" greater than OD of CSST
Figure 4.27 Installation in Nonmetallic Conduit In Slab
Ends of conduit do not have
to be sealed
CSST
4" Min
PVC or PE Conduit*
1
1
⁄2" minimum concrete cover
1
1
⁄2" Min
Footing
Recommended minimum bend radius: 6”
*ID of conduit should be at least 1/2” greater than OD of CSST
Ends of conduit to be
sealed
Vent
Figure 4.28 Installation in Nonmetallic Conduit with Venting
Note: If installed underneath mobile homes or in crawl spaces, HOME-FLEX® should be
installed in accordance with Section 4.3, Outdoor Installation Issues.
4.10 Electrical Bonding
Proper bonding and grounding may reduce the risk of damage and re from electrical arcing
to CSST as a result of a lightning strike. Lightning does not have to strike a structure directly
to cause damage. Conductive systems, like piping or wiring, can become energized indirectly
by a lightning strike. When systems are not properly bonded, the current from the energized
line can cause electricity to arc (or jump) from one system to another and damage the CSST.
Proper adherence to the bonding instructions should lower the risk of electrical arcing and
related damages.
Bonding Guidelines
In accordance NFPA 54 Section 7.13, Valencia Pipe Company requires proper bonding
of HOME-FLEX® gas piping to the electrical grounding system of any structure in which
HOME-FLEX® is installed. Electrical work must be performed by a qualied person recognized
by the local jurisdictional authority as being capable of performing such work. All installa-
tions of CSST for use in natural and propane (LP) gas piping systems in single and multi-family
structures, whether or not the connected gas equipment is electrically powered, require
direct bonding. Bonding of commercial systems are to be designed by qualied persons
according to the local electrical code.
HOME-FLEX® CSST installations inside or attached to building exteriors are to be electrically
continuous and direct bonded to an eective ground-fault current path. Direct bonding of
gas piping systems is achieved when the following guidelines are met: