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Minimum requirements that need to be adhered to are written in the standards
Standards exist to ensure adequate functionality of an installation.
If you have a drainage system, you have to contain the water and the air inside that system.
In a drainage system, you are required to let the air out.
SANS 10254 allows for plumbers to mount 200L geysers against a vertical services, even if it isn’t a wall mounted geyser.
When you cut a pipe, you should be cutting it with a hacksaw only.
Best practice is fluid.
Best practice should not encroach on the minimum requirements.
The standards are in place in order to try and get the system to achieve a minimum set of performance levels.
Standards cannot be disregard regardless of what you have been taught.