Section 381 - Waterclosets1. There shall be provided for every mercantile establishment, every restaurant, every telegraph or messenger company in a city and every station, terminal or car barn where women employees of a street, surface, electric, subway, or elevated railroad report for duty a sufficient number of suitable and convenient waterclosets. They shall be maintained inside the building where the employees work, except where, in the opinion of the commissioner, it is impracticable.2. There shall be separate watercloset compartments or toilet rooms for females, constructed and maintained in accordance with the rules of the board.3. The use of any form of trough watercloset, latrine or school sink within any mercantile establishment or restaurant is prohibited.4. All waterclosets, urinals, watercloset compartments and toilet rooms and the plumbing in connection therewith shall be properly constructed, installed, ventilated, lighted, heated and maintained in accordance with the rules of the board.