Page 157 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 2 Common processes and techniques

c PVCu
d MDPE

7 Which of the following is not a common size for PVCu soil pipes?
a 65 mm
b 82 mm
c 110 mm
d 160 mm
8 What is the maximum diameter of hole that can be drilled in a joist?
a 10% of the depth of the joist
b 20% of the depth of the joist

c 25% of the depth of the joist
d 30% of the depth of the joist
9 When installing 28 mm copper pipe in the horizontal plane, what is the
recommended clipping distance?

a 1.8 m
b 2.4 m
c 2.7 m
d 3.0 m
10 Which of the following is the maximum recommended clip distance for
40 mm plastic waste pipe in the vertical position?
a 0.5 m
b 0.9 m
c 1.2 m
d 2 m
11 Complete the table below to indicate which gauge of screw is suitable for
each plastic rawlplug type.

Yellow

Red

Brown
Grey

White

Blue

12 Calculate the maximum depth of notch if preparing to install copper pipe
in a joist that is 300 mm deep.
13 What grade of copper tube is most commonly supplied in coils and used
for microbore heating installations?
14 Give three statutory regulations relevant to the installation of a central
heating system.

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