"Master plumber" means "master plumber" as defined in RSA 329-A:2, I, namely "any person, firm, corporation, or limited liability company that, as a business, hires or employs a person or persons to do plumbing work, or, without hiring any person, does that work as a principal business or as auxiliary to a principal business for his or its own account."

Source. (See Revision Note at part heading for Plu 301) #8981, eff 9-20-07