§ 3. Application to certain municipalities. 1. This chapter shall apply to all cities of less than three hundred twenty-five thousand population and to all towns and villages.

2. Whenever the word "municipality" occurs in this chapter, it shall mean a city, town or village to which the chapter is applicable. The words "charter," "ordinance," "resolution," "regulation," "building code," "department of health," "department of water supply," "fire department," "department," "board," "municipal engineer," "building official," "corporation counsel," "municipal treasury," or "fire limits," shall be construed as if followed by the words "or corresponding authority of any municipality in which the dwelling or location referred to is situated."

3. Wherever in this chapter the installation or maintenance of a fire alarm system, fire detecting system, watchman's clock system, sprinkler system, fire-escape system or part thereof is required or permitted, such system or part thereof shall be constructed, installed, arranged and maintained in a manner satisfactory to the department in accordance with rules and regulations adopted by the commission pursuant to section three hundred twenty-six of this chapter.