166 / 180
166
Technical
information
Wiring accessories
Recommended quantity of socket outlets for domestic installation
Inadequate installations can occur when not enough socket outlets have been installed or where the existing sockets are located in the wrong
areas. This could lead to potentially dangerous improvisations.
The table below summarises the recommendations of the Electrical Installation Industry Liaison Committee (EIILC) regarding the minimum
number of twin switched socket outlets per room, suitable for domestic installations. This takes into account likely uses and likely trends.
Room
Number of sockets
Room
Number of sockets
Kitchen
4
Landing/stairs
1
Lounge
6
Hall
1
Dining room
3
Garage
2
Double bedroom
3
Store/workroom
1
Single bed-sitting room 3
Central heating boiler point
1
Wiring circuits for 6AX and 10AX switches
Diagram A – One way circuits
Diagram C – Intermediate circuits
Diagram B – Two way circuits
Note:
1 way or 2 way switches can be
replaced by dimmer switches. Rotary dimmers
are 1 way only whilst Push dimmers are 2
way. LV dimmers are suitable for use on the
LV input side only.
L1
L2
L
N
L
N
N2
L2
L1
N1
COM
COM
COM
COM
L1 L1
L2 L2
L1 L1
L2 L2
L
N
L
N
COM
COM
COM
COM
L1 L1
L2 L1
L2 L3
L4 L2
L1
L1
L2
L2
L1
L2
L3
L4
L
N
L
N
Note:
Metal clad accessories are supplied complete with a 42mm surface mounted box in the same matching finish. Metal plate accessories
are not suitable for mounting on surface moulded pattresses.
*Dependent upon wiring configuration
**For 16mm flush fitted steel boxes use adaptor plate supplied when mounting 2 Way Ultimate slim line moulded dimmer switches
Accessories mounting box
Product
Description
Ultimate
white moulded
Exclusive
white moulded
Ultimate
metal plate
Exclusive
metal plate
6AX/10AX plate switches
1-2 gang
16mm
16mm
16mm
25mm
3 gang
25mm
25mm
25mm
25mm
4-6 gang
25mm
25mm
25mm
25mm
TP isolator
25mm
25mm
25mm
25mm
Dimmer switches
1 & 2 gang
**16mm/25mm **16mm/25mm 25mm
25mm
3 & 4 gang
25mm
25mm
25mm
25mm
Socket outlets
1 gang
25mm*/35mm
25mm
25mm*/35mm 25mm
2 gang
25mm*/35mm
25mm
25mm*/35mm 25mm
3 gang
25mm
Round pin sockets
25mm
25mm
25mm
25mm
RCD socket outlets
1 & 2 gang
25mm
25mm
Fused connection units
25mm
25mm
35mm
25mm
Flex outlet plates
25mm
25mm
20AX key switches
25mm
25mm
25mm
25mm
20AX DP switches
25mm
25mm
25mm
25mm
32A DP plate switches
1 gang
47mm
47mm
47mm
2 gang
47mm
47mm
47mm
45A DP switches
1 gang
47mm
47mm
47mm
2 gang
47mm
47mm
47mm
45A DP ceiling switch
47mm
Cooker connection units
47mm
47mm
47mm
47mm
Cooker terminal box
47mm
47mm
Shaver sockets
47mm
47mm
47mm
Telephone socket outlets Master & secondary 25mm
25mm
25mm
25mm
Co-axial socket outlets
Single & twin
25mm
25mm
25mm
25mm
Diplex and triplex
25mm
25mm
35mm
25mm
Satellite socket
25mm
25mm
25mm
25mm
RJ45 & RJ11
35mm
35mm
35mm
35mm