“anti-siphon pipe” means any pipe provided in conjunction with a trap in the sanitary fitting to prevent unsealing of the trap by siphonage or black-pressure;

“business building” means any building occupied for the transaction of business or for the rendering of professional services, and includes any building occupied for the display or sale of goods, wares or merchanise, or for the performance of work or labour, and, without in any way limiting scope of this definition, includes-

bakeries;
banks;
cafes;
creameries;
electricity substations;
factories;
ice-plants;
laboratories;
laundries; office buildings;
petrol-filing stations;
power-plants;
radio-stations;
restaurants;
telephone exchanges;
workshops;

“drainlayer” means a person undertaking sewerage work;

“institutional building” means any building primarily used for housing persons receiving medical, charitable or other care or treatment, or in which persons are involuntarily detained, and, without in any way limiting the scope of this definition, includes-

creches;
home for aged;
hospitals;
infirmaries;
maternity homes;
mental hospitals;
nursing homes;
nursery schools;
orphanages;
sanatoria;

“junction” means a pipe-junction for the purpose of receiving a private drain or private sewer or a connexion from such a drain or sewer;

“one pipe system” means the system of piping between sanitary fittings and a private sewer, in which both waste and soil-water are permitted to flow down a common stack;

“plumber” means a person undertaking plumbing work;

“plumbing system” means the system for the conveyance of the water-supply within the boundary of any premises to the various sanitary fittings on such premises, and for the conveyance of waste water, soil water or other waste liquid to the private sewer or combined private sewer.

“plumbing work” means work in connexion with the installation, alteration, repair or maintenance of a plumbing system;

“public building” means any building used of intended to be used by persons congregating for civic, political, educational, religious, culture, social or recreational purposes, or for purposes of sport and, without in any way limiting the scope of this definition, includes-

armouries;
assembly halls;
auditoria;
bath-houses;
bowling alleys;
cinemas;
club-rooms;
colleges and schools (non-residential);
dance halls;
drill-halls;
exhibition buildings;
grand stands;
gymnasia;
lecture-halls;
libraries;
lodge-rooms;
museums;
passenger-stations;
public swimming-baths;
skating-rinks;
stadia;
theatres;

“residential building” means any building, other han an institutional building, which provides sleeping-accommodation for persons, and, without in any way limiting the scope of this definition, includes-

boarding-houses;
convents;
dormitories;
dwellings;
hostels;
hotels;
lodging-houses;
residential clubs;
residential schools and colleges;

“septic tank” means any covered tank, complete with effluent overflow, intended to receive sewage and designed to retain such sewage for such a time and in such a manner as to secure adequate decomposition of organic solids by bacterial action;

“sewage” means waste water, soil-water or other liquid waste, excluding the water mentioned in the definitions of “private drain” and “public drain” in the Urban Councils Act [Chapter 214];

“sewer” means an underground pipe used for conveying sewage, and includes all other things necessary in connexion therewith. Where “sewer” occurs in this chapter, it shall, unless the contrary intention appears from the context, be constructed as meaning a private sewer or combined private sewer.

“sewer connexion” means that portion of a pipe which is provided to connect a private sewer or combined private sewer with a public sewer and the ownership of which is vested in the local authority;

“sewerage work” means work in connexion with installation, maintenance, alteration or repair of private sewers or combined private sewers, but shall not include work on sanitary fittings, stack pipes, rain-water pies or rain gutters;

“single-stack system” means a system in which grouped appliances discharge into a single soil and waste stack, and all traps are unventilated;

“soil-pipe” means a pipe for conveying soil water from the trap or outlet of a soil-water fitting to a private sewer or combined private sewer;

“soil-water fittings” means all fittings directly appurtenant to the discharge of soil-water, including water-closets, urinals, bidets, slop-hoppers and similar fittings;

“stack” means any vertical or inclined line of waste or soil-piping, or a combination of both, and the branches connected thereto, which conveys the flow of liquid from waste or soil-pipes to any gully-trap, channel or sewer, including any vent used in connexion therewith,

“trade or industrial premises” means any premises used or intended to be used for carrying on any trade, manufacture or industry, and which produce a trade effluent;

“trap” means any pipe or fitting so bent or formed that it retains a quality of liquid part of which forms a seal or barrier to the passage of air or gas;

“two-pipe system” means the system of piping between sanitary fittings and a private sewer or combined private sewer wherein separate stacks are used to connect soil and waste fittings and on which the waste water system is completely disconnected from the soil water system;

“ventilation-pipe” or “vent pipe” means any pipe or portion of a pipe fitted vertically or at an incline, and provided solely to ventilate a sewerage system and to prevent trap siphonage or back pressure;

“waste-pipe” means any pipe connected to any waste-water fitting and used for the conveyance of waste water to any gully-trap, floor-channel or waste or soil-stack, but doe not include any fitting, gully channel or sewer into which such waste-pipe may discharge;

“waste-sewer” means such part of a private sewer or combined private sewer as compromises under ground piping and is used or intended to be used for conveyance of waste water only;

“waste-water fittings” means all fittings directly appurtenant to the discharge of waste water, and includes baths, wash basins, gullies, sinks and all other fittings which sub serve a similar purpose.