Building Regulations, National Building Code (Mabhas 14, 16, 17, 22) and Standards
This domain tests how the National Building Code is structured and applied, and which code governs a given mechanical question.
The relevant Mabhas
Mabhas 14 governs design and installation of mechanical installations: water supply, drainage, heating, cooling, ventilation and related equipment rooms and shafts. Mabhas 16 governs hygiene: potable water quality, sanitary facilities and fixture provision, ventilation for health, waste and noise. Mabhas 17 governs natural gas piping design and installation. Mabhas 22 governs maintenance and operation of the completed building - it is not a design code, but it defines what the owner must be handed over. Neighbouring codes matter constantly: Mabhas 3 for fire, 19 for energy, 13 for electrical coordination, 15 for lifts, 12 for site safety and Mabhas 2 for the administrative process of approval and supervision. Where the code is silent, it points to national standards (ISIRI) and recognised references such as ISO, ASHRAE and NFPA; local bylaws cannot relax the code.
How to answer
Identify the governing Mabhas, the edition in force, the clause topic and who holds the duty. Where two provisions conflict, the stricter governs, and the designer must resolve the conflict before construction rather than the supervisor on site.
Worked example
A five-storey residential building proposes a gas-fired boiler in the basement next to a car ramp. Mabhas 17 restricts gas appliances and cylinder locations and requires combustion air and safe flue discharge; Mabhas 3 requires fire separation and, for the height, hose reel provision. The resolution is not to pick one clause: the room must satisfy both, and if the location cannot be made compliant, the boiler room must be relocated and the drawings revised through the designer.
Traps
Quoting a superseded edition; treating Mabhas 22 as a design code; assuming a municipal bylaw overrides the national code; and citing the wrong Mabhas for potable water quality (it is 16, not 14).