Which code is specifically for oil and solid fuels?

The correct choice for the code specifically addressing oil and solid fuels is the Mechanical Code. This code provides the necessary standards and regulations concerning the installation, maintenance, and operation of mechanical systems, which include heating appliances that utilize oil and solid fuels.

The Mechanical Code is designed to ensure that such systems are installed safely and operate efficiently, addressing concerns such as proper venting, fuel delivery, and combustion air requirements. This ensures the safety of occupants and helps mitigate risks associated with the use of flammable fuels.

Other codes mentioned, like the Residential Code, typically cover a broader spectrum of construction and occupancy requirements but do not focus specifically on the mechanics of fuel appliances. The Commercial Code also addresses various building systems but is more oriented towards commercial establishments. The Cable Code pertains to electrical wiring and installations, making it unrelated to fuel appliances.