Installation Instructions

ELECTRICAL BONDING

In accordance with the NFPA 54 Section 7.13, Tru-Flex Metal Hose Corp., requires proper bonding

of the Pro-Flex® gas-piping systems in a structure to the structure’s electrical grounding system.

This must be performed by a qualified person recognized by the local jurisdiction as capable of

erforming such work. These requirements are for all Pro-Flex® CSST installations.

Direct bonding of Pro-Flex® CSST is required as part of the installation of all new CSST natural

and LP gas piping systems whether or not the connected gas equipment is electrically powered.

This requirement is provided as part of the manufacturer’s instructions for single-family and multi-

family dwellings. Bonding for commercial applications should be designed by qualified persons

knowledgeable in electrical system design and the local electrical code.

Pro-Flex® CSST installed inside or attached to the exterior of a building structure shall be

electrically continuous and direct bonded to an effective ground-fault current path. The gas piping

systems shall be considered to be direct bonded when installed in accordance with the following

guidelines:

• A bonding jumper is permanently and directly connected to the electrical service grounding

system. This can be achieved through a connection to the electrical service equipment

enclosure, the grounded conductor at the electrical service, the grounding electrode conductor

(where of sufficient size) or to the one or more grounding electrodes used.

• A single bond connection is made to the building gas piping downstream of the utility meter

or second stage regulator (LP systems), but near the gas service entrance of the structure, or

downstream of the gas meter of each individual housing unit within a multi-family structure.

(A bonding connection shall not be made to the underground, natural gas utility service line or

the underground supply line from a LP storage tank)

• The bonding conductor shall be no smaller than a 6 AWG copper wire or equivalent.

Bonding/grounding clamps shall be attached in an approved manner in accordance with NEC

and the listing of the clamp. Bonding /grounding clamps shall be listed to UL 467. The point

of attachment for the bonding conductor shall be accessible. This bond is in addition to any

other bonding requirements as specified by local codes.

• For attachment to the CSST gas piping system, a single bonding clamp must be attached to

either a Pro-Flex® brass fitting, a steel manifold or to any rigid pipe between the meter and

the first CSST fitting in the system.

The corrugated stainless steel tubing portion of the gas

piping system shall not be used as the point of attachment of the bonding conductor at any

location along its length under any circumstances. See drawings 1,2 and 3.

Note: Bonding Clamp must

be listed to UL

467

UL 467

Drawing 1

Note: Bonding wire must be

no smaller than 6

Note: Remove any paint on pipe

surface beneath clamp location