The rules of this Standard cover requirements for the assembly, installation, maintenance, and operation of controls and safety devices on automatically operated boilers directly fired with gas, oil, gas-oil, or electricity, subject to the service limitations, exclusions, and acceptance to other listings in CG-120, CG-130, and CG140, respectively. A burner field-installed on boilers or as a replacement burner shall comply with the requirements of CF-110 and CF-140 for gas and oil firing, respectively. The use of a gaseous or oil fuel not listed in the definitions has not been evaluated and special considerations may be required.