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REGULATIONS RELATINGTO: EXAMPLES
Upstairs Sockets
Downstairs Sockets
Kitchen Sockets
Cooker outlet with integral 13A socket
Garage Sockets
Plus any other sockets up to 20A rated
Shower circuit
Lighting circuit
Heating circuit
Ventilation circuit
Shaver Socket
Plus Other circuits
Downstairs Lighting
Upstairs Lighting
Immersion heater
Smoke Alarms
Burglar Alarm (Safety service)
Plus any other circuits
Note: Each circuit may have more than one reason for additional protection by 30mA RCD eg: firstly because of the equipment ie: a socket
outlet and secondly because of the cable installation method.Additional protection is provided as additional protection. It does not obviate
the need for circuit protection by circuit breakers or fuses.
* Regulation 411.3.3 socket outlets with a rated current not exceeding 20A that are for general use by ordinary persons (exemption may be permitted).
** Regulation 701.411.3.3 Additional protection shall be provided for all circuits of the location by use of one or more 30mA RCD.
*** Regulations 522.6.101 522.6.102 522.6.103 cables concealed in a wall or partition at less than 50mm depth and without earthed mechanical protection
e.g. conduit.
**** Regulation 314.1 Every installation shall be divided into circuits as necessary to avoid danger and inconvenience in the event of a fault, take account of
danger that may arise from the failure of a single circuit such as a lighting circuit, reduce the possibility of unwanted tripping of RCDs etc.
**** Regulation 314.2 Separate circuits to be provided for parts of the installation that need to be separately controlled in such a way that those circuits
are not affected by the failure of other circuits.
***** Regulation 560.7.1 Chapter 56 circuits for safety services shall be independent of other circuits.
In addition Chapter 51 requires designers/installers to take account of all relevant British Standards and manufacturers instructions. For example BS5839
Part 6 is the British Standard for fire detection and alarm systems in dwellings. It states that power supplies to Grade D smoke alarms should be an
independent circuit at the consumer unit, or a separately electrically protected local lighting circuit.
British Standards and IEE regulations are subject to change and amendments.This guide toWylex consumer units is not a substitute for the regulations
which should always be used for all types of electrical installation design and installation work
.
ADDITIONAL PROTECTION
30mA RCD
30mA RCDs
30mA RCD
411.3.3
*
701.411.3.3
**
522.6.101
522.6.102
522.6.103
and
560.7.1
*****
Sockets up to 20A
rating for general use
by ordinary persons
Taking into account
3.14.1 ****
3.14.2 ****
Taking into account
3.14.1 ****
3.14.2 ****
Taking into account
3.14.1 ****
3.14.2 ****
All Circuits in a room
with a fixed bath or
shower
All circuits buried in
a wall or partition at
less than 50mm and
without mechanical
protection
SUMMARY TABLE
CONSUMER UNIT SELECTION GUIDE
Under the latest 17th edition wiring regulations certain installations
require “additional protection” on many MCB circuits that were not
previously protected by the supplementary use of 30mA RCDs.
Extracts from the regulations and examples of these ‘newly’ protected
RCD circuits are given in the summary table below.
THE 17th EDITIONWIRING REGULATIONS
HALF INDEPENDENT CIRCUITS
Split Load
ALL INDEPENDENT CIRCUITS
Main Switch - RCBOs
NO INDEPENDENT CIRCUITS
Dual RCD
SOME INDEPENDENT CIRCUITS
High Integrity
30mA Earth leakage Protection
59
RCBOs RCDs - Application Data
N
Cooker
SocketsDownstairs
SocketsUpstairs
GarageSocket
ShaveSocketBathroom
SmokeAlarm
Hall /StairsLighting
LightsUpstairs
LightsDownstairs
Spare
Spare
Main Switch - RCBOs
C40 30mA
NHXSBS1C40
Test
C32 30mA
NHXSBS1C32
Test
C32 30mA
NHXSBS1C32
Test
C16 30mA
NHXSBS1C16
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
Spare
Shower
SmokeAlarm
Hall /StairsLighting
LightsUpstairs
LightsDownstairs
SocketsDownstairs
SocketsUpstairs
GarageSockets
Split Load - RCBOs/MCBs
RCD
O
-OFF
80A30mA
WRS80/2
TEST
N
C40 30mA
NHXSBS1C40
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
B32
NHXB32
MCB
B32
NHXB32
MCB
B16
NHXB16
MCB
Spare
SmokeAlarm
Hall /StairsLighting
Cooker
SocketsDownstairs
GarageSockets
LightsUpstairs
SocketsUpstairs
ShaveSocketBathroom
LightsDownstairs
High Integrity - RCBOs/MCBs
N
RCD
O
-OFF
80A30mA
WRS80/2
TEST
RCD
O
-OFF
80A30mA
WRS80/2
TEST
B32
NHXB32
MCB
B6
NHXB06
MCB
B16
NHXB16
MCB
B6
NHXB06
MCB
B40
NHXB40
MCB
B32
NHXB32
MCB
B6
NHXB06
MCB
C6 30mA
NHXSBS1C06
Test
C6 30mA
NHXSBS1C06
Test
Spare
SocketsDownstairs
GarageSockets
LightsUpstairs
Hall /StairsLighting
SocketsUpstairs
ShaveSocketBathroom
LightsDownstairs
Shower
Spare
Dual RCD - RCBOs/MCBs
RCD
O
-OFF
80A30mA
WRS80/2
TEST
RCD
O
-OFF
80A30mA
WRS80/2
TEST
N
B40
NHXB40
MCB
B32
NHXB32
MCB
B6
NHXB06
MCB
B6
NHXB06
MCB
B432
NHXB32
MCB
B16
NHXB16
MCB
B6
NHXB06
MCB
B6
NHXB06
MCB
B6
NHXB06
MCB