L3 YR2 Revision 3 (Cold 3)

An RPZ valve should be installed with

• an isolating valve upstream of the RPZ valve

• an isolating valve downstream of the RPZ valve

• an isolating valve both upstream and downstream of the RPZ valve

• no isolating valves

In which one of the following fluid categories does the domestic water from a wash hand basin fall?

• Category 1

• Category 2

• Category 3

• Category 4

Under Regulation 5 of the Water Regulations, the water undertaker must be informed when which one of the following operations is carried out?

• Installation of a pump drawing more than 12 litres per minute

• Installation of a bidet without an ascending spray or flexible hose

• Installation of a bath with a capacity of less than 230 litres

• Installation of an RPZ valve to protect against a category 2 fluid

What is the component labelled A in the diagram

• Expansion cistern

• Break cistern

• Duplicate pumps

• Circulating pumps

The type of non-mechanical backflow prevention used on a domestic wash hand basin is known as

• AUK 1

• AUK 2

• AUK 3

• AUK 4

Which of the following items of legislation covers the requirements for the hydraulic testing of cold water pipe lines?

• Water Byelaws (England 2004)

• British Standards 5449

• Water Supply (Water Fittings) Regulations 1999

• Building Regulations Part G (P in Northern Ireland)

Which one of the following mechanical backflow prevention devices would be used when installing a replacement hose union bib tap?

• BA

• HUK1

• HC

• HA

Which of the following types of air gap provides suitable backflow protection for the taps in a wash hand basin installed in a hospital?

• AB air gap

• AUK 1 air gap

• AUK 2 air gap

• AUK 3 air gap

Service valves should be installed in which one of the following locations?

• On the cold feed to the primary circuit

• On the cold feed pipe from the cold water storage cistern

• Immediately after the internal stop valve

• Immediately after the external stop valve

Metallic cold water systems should be capable of withstanding an internal pressure of:

• the maximum potential operating pressure

• 1.5 times the maximum potential operating pressure

• 2 times the maximum potential operating pressure

• 3 times the maximum potential operating pressure