507.6 Added or Converted Equipment or Appliances.

When additional or replacement appliances or equipment is installed or an appliance is converted to gas from another fuel, the location in which the appliances or equipment is to be operated shall be checked to verify the following: (1) Air for combustion and ventilation is provided where

required, in accordance with the provisions of Section

(1) Air for combustion and ventilation is provided where

required, in accordance with the provisions of Section 506.0. Where existing facilities are not adequate, they shall be upgraded to meet Section 506.0 specifications. (2) The installation components and appliances meet the clear ances to combustible material provisions of Section 507.27.

(2) The installation components and appliances meet the clear ances to combustible material provisions of Section 507.27. It shall be determined that the installation and operation of the additional or replacement appliances do not render the remaining appliances unsafe for continued operation. (3) The venting system is constructed and sized in accor dance with the provisions of Section 509.0. Where the

(3) The venting system is constructed and sized in accor dance with the provisions of Section 509.0. Where the existing venting system is not adequate, it shall be upgraded to comply with Section 509.0. [NFPA 54:9.1.2]