The holder of a Master Class A license is limited to what type of work?

The holder of a Master Class A license is allowed to work with no limits concerning the BTU input capacity of the system. This means they are certified to handle all aspects of mechanical and gas work, regardless of the size or complexity of the systems involved. Master Class A license holders possess the highest level of training and expertise, enabling them to oversee, install, and maintain systems that have a full range of BTU inputs, be it residential or commercial. This expansive capability is a reflection of the advanced knowledge and skill required for handling various mechanical systems effectively and safely.

The other options refer to specific restrictions which do not apply to a Master Class A license, emphasizing limitations that do not align with the qualifications and authority granted to such a credential holder.