Plumbing NVQ and Technical Certificate Level 2, 2nd Edition

These flashcards cover key concepts related to plumbing systems, particularly focusing on direct and indirect cold-water systems, their advantages, disadvantages, and relevant standards.

Magnetic conditioners

Devices that change the molecular structure of salts in water using a small electric field.

Direct cold-water system

A system where all pipes to draw-off points run directly from the mains under pressure.

Indirect cold-water system

A system where draw-off points are fed from a cold-water storage cistern, which is directly supplied from the mains.

Advantages of direct systems

Cost-effective installation with less pipework and smaller storage cisterns, enabling drinking water availability from all points.

Disadvantages of direct systems

Higher pressure may cause noise, no reserve water supply, and increased wear on fittings.

BS6700

The British Standard detailing installation requirements for hot and cold water systems.

Cold-water storage cistern

A facility that supplies wholesome water and includes protections against contamination.

Inlet control device

A device fitted to a cistern to maintain the correct water level.

Water Regulations

Regulations ensuring that water storage systems are designed to prevent contamination.

Minimum size for cold-water storage in a direct system

100 liters, as per BS 6700 recommendations.

Minimum size for cold-water storage in an indirect system

230 liters, to supply both hot and cold outlets.

Reserve of water

Additional water stored in an indirect system in case of mains supply failure.

Frost damage risk

Increased risk associated with larger storage cisterns in indirect cold-water systems.