255.355 Customer meters and regulators: protection from damage.

(a)If the customer's equipment or supplemental gas supply might create either a vacuum or a back pressure, a device must be installed to protect the distribution system. Commingling of a customer's supplemental gas supply with utility supplied gas is permissible provided the customer verifies that the supplemental gas is interchangeable with the gas supplied by the utility.#

(b)The outside terminal of each service regulator vent and relief vent must:#

(1)be rain and insect resistant;#

(2)be located at a place where gas from the vent can escape freely into the atmosphere and away from any opening into the building (a minimum of 18 inches [457 millimeters], where practical); and#

(3)be protected from damage caused by submergence in areas where flooding or ice accumulation may occur.#

(c)Each pit or vault that houses a customer meter or regulator at a place where vehicular traffic is anticipated, must be able to support that traffic.#