261.61 Warning tag: Class C condition.

(a)A Class C condition does not present an immediate hazard, but if not corrected, may become hazardous. The operator may leave the gas on.#

(b)Class C conditions include, but are not limited to:#

(1)any gas pipe or appliance which was leaking and has been temporarily repaired;#

(2)situations where the clearance between combustibles and appliances or vent connectors are less than required but no immediate fire hazard exists;#

(3)any gas piping or appliance connection identified as improper or inappropriate;#

(4)vent connectors that have a rusty condition, no draft diverter where required, reduced size or are incorrectly installed but drawing satisfactorily;#

(5)improperly installed appliances such as those identified in the National Fuel Gas Code-NFPA 54 (as described in section 10.3 of this Title); and#

(6)any properly vented appliance developing excessive carbon monoxide.#

(c)For vented room heaters, excessive carbon monoxide shall be defined as 0.02 percent CO in an air-free sample of the flue gases when tested in an area having a normal oxygen supply.#

(d)For all other vented appliances, excessive carbon monoxide shall be defined as 0.04 percent CO in an air-free sample of the flue gases when tested in an area having a normal oxygen supply.#