WorksheetsRequirements of the cold Mains and Water Meter
Total questions: 37
Worksheet time: 19mins
What is the typical minimum depth for the communication pipe serving a domestic water supply?
450 mm minimum depth
900 mm minimum depth
750 mm minimum depth
600 mm minimum depth
Which specification best describes the minimum service pipe for a domestic cold water supply entering a dwelling?
20 mm PVCu pipe
25 mm MDPE pipe
22 mm copper pipe
28 mm steel pipe
Select the components normally associated with incoming mains connections at the boundary.
Booster pump at the boundary
Internal drain-off on rising main
Meter with isolation facility
Ferrule connection for isolation
What is the minimum internal diameter commonly specified for a rising main entering a dwelling?
10 mm minimum size
12 mm minimum size
22 mm minimum size
15 mm minimum size
Which arrangement is correct for an internal water meter installation for safety and maintenance?
Cross bonding provided to the meter
Stop valves fitted both sides
Meter installed after drain-off valve
Meter located outside in boundary box
Which colour identifies MDPE pipe used for wholesome cold water supply?
Green colour for irrigation service
Black colour for external drainage
Blue colour for potable water service
Yellow colour for gas service
What is the minimum service pipe size commonly required for a modern domestic property supply?
25 mm nominal outside diameter
15 mm nominal outside diameter
20 mm nominal outside diameter
32 mm nominal outside diameter
From which point onward is installation work regulated under the Water Regulations 1999?
From the boiler isolation valve
From the main in the public road
From the internal kitchen tap head
From the external stop valve at the meter
How much MDPE should be left exposed above floor level at the entry before connecting to metallic fittings?
More than 500 mm exposed MDPE
At least 300 mm exposed MDPE
Exactly 100 mm exposed MDPE
No more than 150 mm exposed MDPE
Which component creates the watertight seal inside a stop valve when the handle is turned?
A washer pressed onto the seating
A gasket between union couplers
A spring acting against the spindle
A rubber O-ring floating in flow
A cost-effective repair when a stop valve jams is to replace which part?
The entire pipe run
The full body casting
The main service meter
The head gear only
Where must a DOV be installed in a plumbing system?
At every low point in the system
On all high points in vented lofts
Immediately downstream of every tap
Above the incoming stop valve
What administrative requirement applies before carrying out certain plumbing installations?
No notice is ever required
Advance notice must be given
Post-completion audit only
Verbal permission is sufficient
Which organisation provides the essential guide to the Water Regulations for plumbers?
BSI owns the guide
WRAS publishes the guide
HSE issues the guide
CITB prints the guide
Which statement best defines water pressure in plumbing systems?
The force behind water flow in pipework
The temperature change of water in pipework
The height difference between taps and drains
The speed water travels through pipework
Where is water pressure normally first tested in a cold water system?
At the boiler flow connection
At the furthest tap from the meter
Near the point of entry to the property
At the highest bath outlet
Which two basic means can create pressure in plumbing systems?
Weight of water creating head
Using a pump to drive the water
Reducing pipe diameter with valves
Heating water to expand volume
What is the definition of flow rate for a domestic outlet?
The volume of water delivered per minute
The pressure of water at peak demand
The velocity of water through a nozzle
The temperature drop across the tap
Which locations are appropriate for testing key parameters?
Pressure only at the boiler service valve
Flow rate at each individual outlet
Pressure near the main point of entry
Flow rate only at the kitchen cold tap
Convert a flow rate of 60 litres per minute into litres per second.
10 litres per second
6 litres per second
0.1 litres per second
1 litre per second
A basin tap is measured at 6 litres per minute. What is this in litres per second?
1.0 litres per second
0.01 litres per second
0.6 litres per second
0.1 litres per second
Which scenario most likely reduces flow rate in a cold water system during the day?
Off-peak usage with few fixtures
New build with oversized mains
Isolated property with private well
Peak demand when many fixtures run
Which combination typically lowers pressure at a property?
Small incoming main size
Multiple sharp elbows in runs
Short, straight installation pipe
Large distribution main size
Partial blockage from debris
Two homes share the same street main. House A sits on a hill; House B is at the bottom. Which statement is most accurate about pressure?
House A likely has lower static pressure
Both houses have identical static pressure
House B likely has lower static pressure
Neither house has measurable static pressure
Which statement about service pipe sizing for typical modern houses is most accurate?
Usually 25 mm MDPE feeding 15 mm copper
Usually 20 mm MDPE feeding 25 mm copper
Usually 15 mm MDPE feeding 10 mm copper
Usually 28 mm copper feeding 22 mm MDPE
What pipe size is commonly acceptable for distribution in a direct system due to pressure?
15 mm throughout because pressure is high
22 mm throughout to reduce noise and hammer
10 mm throughout due to very high pressure
28 mm throughout to limit pressure drop
Which control or valve would you expect to see on a direct system serving a W.C. cistern?
Pressure reducing valve on a rainwater supply
Gate valve on a gravity header branch line
Spherical or ball-type service valve on mains feed
Float-operated valve fed from a storage tank
Which feature best describes a direct system with a combination boiler?
Dedicated booster set for hot water
No stored water within the dwelling
Hot water stored in vented cylinder
Cold water stored in attic tank
An unvented hot water system shares which key characteristic with a combination boiler direct system?
Both heat water in open vented cylinders
Both rely on gravity-fed pressure
Both require roof storage cisterns
Both operate without stored potable water
At which times is pressure most likely to be very low in direct systems due to demand?
Late night and midday troughs
Mid-afternoon and midnight peaks
Early morning and early evening peaks
Mid-morning and late-night troughs
Select the correct pipe sizing rule for the distribution pipe leaving the storage cistern in an indirect system.
Begin 35mm then remain constant
Always 15mm throughout run
Start 22mm or 28mm then reduce
Use 22mm only for all branches
A dwelling has a cold water storage cistern that supplies only the hot water cylinder. What storage capacity range should be provided to meet common standards?
230–250 litres capacity recommended
200–230 litres capacity recommended
150–200 litres capacity recommended
100–150 litres capacity recommended
A property’s cistern feeds both hot and cold services. Choose the capacity range that aligns with typical BS8558 and Water Regulations guidance.
100–150 litres total capacity
230–250 litres total capacity
80–100 litres total capacity
150–200 litres total capacity
Which method can be used to identify whether a dwelling uses a cold water storage cistern system rather than a mains‑pressure system?
Observe radiator valve positions
Measure room thermostat set point
Inspect loft space for a cistern present
Check boiler flue termination height
You open a bathroom basin cold tap and record a low static pressure that drops further when another outlet runs. What does this most strongly suggest about the system type?
Variable speed booster pump only
Unvented cylinder with balanced pressure
Gravity‑fed system from a cistern
Mains pressure direct system installed
Select all actions that are practical ways to identify the installed cold water system type in an existing house.
Inspect the loft for a cold water storage cistern
Test outlet pressures at several fixtures
Estimate pipe sizes without any measurements
Check electrical consumer unit labeling only
A survey notes a black plastic cistern in the loft and typical guidance indicates 230–250 litres when feeding both hot and cold. What is the main reason for this higher capacity compared to a system feeding only one side?
To prevent corrosion in copper storage pipes
To meet combined demand from two services
To comply with gas safety ventilation rules
To reduce thermal expansion of hot water
