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What is the purpose of a DC pipe interrupter?

• To increase water flow in the pipes

• To create an air inlet in the event of a back siphonage situation

• To measure water pressure in the pipes

• To heat the water in the plumbing system

What happens when water begins to backflow due to back siphonage?

• The DC pipe interrupter closes to maintain pressure

• The DC pipe interrupter heats the water to prevent backflow

• Air is admitted to break the siphonic action and prevent contamination

• The DC pipe interrupter pumps the water out of the system

How should the valve of a DC pipe interrupter be fitted?

• Horizontally, facing upwards

• Vertically, facing downwards, at least 300mm above the spillover level of the appliance, or 150mm in the case of a urinal

• Diagonally, facing sideways

• Vertically, facing upwards, directly at the spillover level

What is the minimum distance required below a DC pipe interrupter to prevent back siphonage?

• Not less than 100mm minimum

• Not less than 150mm minimum

• Not less than 200mm minimum

• Not less than 250mm minimum

For what fluid category is a TYPE DC in-line pipe interrupter suitable for protection?

• Back Pressure

• Back Siphonage

• Both Back Pressure and Back Siphonage

• Neither Back Pressure nor Back Siphonage

What is a Type DC pipe interrupter suitable for protection against?

• Back Pressure only

• Back Siphonage only

• Both Back Pressure and Back Siphonage

• Neither Back Pressure nor Back Siphonage

What type of backflow prevention device is a BA?

• Hose union backflow preventer

• Verifiable backflow preventer with reduced pressure zone

• Pipe interrupter with atmospheric vent and moving element

• Diverter with automatic return

Which backflow prevention device is suitable for protection against fluid category 4 for both back pressure and back siphonage?

• CA

• EA/EB

• BA

• HA

Which device is only permitted as a replacement for existing bib taps in house installations?

• HA

• HUK 1

• HC

• CA

What does an RPZ valve incorporate?

• A differential relief valve and one check valve

• A differential relief valve and two check valves

• A differential relief valve and three check valves

• Two differential relief valves and one check valve