Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

Appendix 12
Worked Examples for Application of the CoP
(A) General application of the CoP in the design of wiring
installation of a typical dwelling
1. Objective
This worked example shows the general application of the CoP in the
design of the wiring installation for an individual dwelling.
2. Assumed data of the dwelling
(i) Number of bedrooms = 2
(ii) Size of each bedroom = 7 m 2
(iii) Size of living room = 16 m 2
(iv) Size of kitchen = 4.5 m 2
(v) Steel conduit wiring system to be used
3. Final circuits for the dwelling
(a) The following socket outlets are required (Table 26(1))—
(i) 3 socket outlets for each bedroom;
(ii) 7 socket outlets for the living room; and
(iii) 4 socket outlets for the kitchen.
(b) Other outlets required—
(i) Three connector units controlled by 20A double-pole switches,
one for an air-conditioner installed in the living room, two for
air-conditioners in the bedrooms.
(ii) 6 fixed lighting points (1 for each bedroom, 2 for the living
room, 1 for the kitchen and 1 for the bathroom).
(c) Final circuits required for subparagraphs (a) and (b) are shown
below—
(i) A 30A ring final circuit using 13A socket outlets serving the
living room and the bedrooms.
(ii) A 30A ring final circuit using 13A socket outlets serving the
kitchen.
(iii) A 20A exclusive radial final circuit for an air-conditioner in the
living room (Code 26A(4)).
(iv) A 15A exclusive radial final circuit for an air-conditioner in each
bedroom (Code 26A(4)).
(v) Two 5A radial final circuits for lighting points (one of them is
also for door bell).
292