Installation Guide

36
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
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 all 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:
• Direct and permanent connection of a bonding jumper to the electrical service
grounding system by connecting to the: electrical service equipment enclosure,
the grounding electrode conductor (if of sucient size), the grounded conductor
at the electrical service, or to one or more grounding electrodes. The piping sys-
tem shall not be used as a grounding electrode for an electrical system.
• A single bond connection near the gas service entrance of the building (or down-
stream of the gas meter of each housing unit in a multi-family structure) to the
structure’s gas piping downstream of the utility meter, or the second stage regu-
lator for LP systems. Bonding connections are not to be made to underground
natural gas utility service lines or supply lines from LP tanks.