Range Overview
Explore the features of the Consumer Units range:
Lockable cover option available Easy access of cables via knockouts, in sides top and bottom, plus additional rear entry knockouts Spirit level, to enable quick installation Backed-out and retained terminal screws, prevents loss of screws, and saves on installation timeThe BS 7671 : 2018 18th Edition IET Wiring Regulations
Requirements for Additional Protection (30mA RCD)
The 18th Edition Wiring Regulations also has the requirement for additional protection from 30mA RCDs, summarised below.
Within domestic (household) premises, consumer units and similar switchgear assemblies shall comply with BSEN 61439-3 and shall:
NOTE: Ferrous metal, e.g. Steel, is deemed to be an example of a non-combustible material
Additional requirements for socket-outlets and for the supply of mobile equipment for use outdoors
In AC systems, additional protection by means of an RCD with a rated residual operating current not exceeding 30mA shall be provided for:
An exception to (i) is permitted where, other than for an installation in a dwelling, a documented risk assessment determines that RCD protection is not necessary
The requirements of Regulation411.3.3 do not apply to FELV systems according to Regulation411.7 or reduced low voltage systems according to Regulation 411.8
NOTE 1: See also Regulation 314.1(iv) and 531.3.2 concerning the avoidance of unwanted tripping
NOTE 2: See Appendix 2, item 11 in respect of risk assessment
NOTE 3: A lighting distribution unit complying with BS5733, luminaire track system, installation coupler, LSC or DCL is not regarded as a socket-outlet for the purposes of this regulation
A cable installed under a floor or above a ceiling shall be run in such a position that it is not liable to be damaged by contact with the floor or ceiling or their fixings
A cable passing through a joist within a floor or ceiling construction or through a ceiling support (e.g. under floorboards), shall:
Additional protection by the use of one or more RCDs having the characteristics specified in Regulation 415.1.1 shall be provided for low voltage circuits
NOTE: see also Regulations 314.1 (iv) and 531.3.2 concerning the avoidance of unwanted tripping
Every installation shall be divided into circuits, as necessary, to:
18th Edition BG Consumer Unit Options
Possible consumer unit options to support 18th Edition Wiring Regulations Compliance
Note:- The following diagrams use a 12 module consumer unit to demonstrate the available options
Main Switch
Split Load
Dual RCD
High Integrity Dual RCD
Standard Dual RCD consumer unit offers option of High Integrity Dual RCD as standard
Note: High Integrity Triple RCD is achieved using only the 22 module Consumer Unit
Standards
New all metal consumer units comply with 18th Edition Wiring Regulations BS 7671'
Product | Standard |
Consumer Unit | BS EN 61439-3 |
Main Switch | EN/IEC 60947-3 |
MCB | EN/IEC 60898 |
RCBO | EN/IEC 61009-1 |
Product | Standard |
RCD | EN/IEC 61008 |
Enclosure | EN/IEC 60439 |
Contactor | EN/IEC 60947, 61095 |
RCBO | EN/IEC 61558-1 |
Technical
Devices - Pole pitch 18mm
Consumer Unit | Metal(A) |
8 modules | 244mm |
12 modules | 316mm |
16 modules | 388mm |
19 modules | 442mm |
22 modules | 496mm |
Terminals
Device | Capacity mm2 | Max Torque Nm |
Switch | 35 | 2.5 |
MCB | 16(32-50A 25mm2) | 2 |
RCD | 35 | 2.5(80A 3.5Nm) |
RCBO | 16(32-40A 25mm2) | 2 |
*Note 8 & 12 module ‘Tall’ variant, height is 261mm
Cut Outs and Knockouts
Range | Top & Bottom Face | Sides | Base |
Metal 8 Module | 6 x ø20mm, 1 x ø32mm | 1 x ø32mm | 1 x ø50 x 100mm |
Metal 12 Module | 8 x ø20mm, 1 x ø32mm | 1 x ø32mm | 1 x ø50 x 100mm |
Metal 16 Module | 9 x ø20mm, 2 x ø32mm | 1 x ø32mm | 2 x ø50mm, 1 x ø50 x 100mm |
Metal 19 Module | 11 x ø20mm, 2 x ø32mm | 1 x ø32mm | 2 x ø50mm, 1 x ø50 x 100mm |
Metal 22 Module | 13 x ø20mm, 2 x ø32mm | 1 x ø32mm | 3 x ø50 x 100mm |
Insulated 8 Module | 4 off - 40, 25 x 16mm | 40, 25 x 16mm | 3 off - 50, 30 x 40mm |
Insulated 12 Module | 6 off - 40, 25 x 16mm | 40, 25 x 16mm | 4 off - 50, 30 x 50mm |
Insulated 12 Module Tall | 6 off - 40, 25 x 16mm | 40, 25 x 16mm, 1 x Ø25 or Ø20mm | 4 off - 50, 30 x 50mm |
Insulated 16 Module | 8 off - 40, 25 x 16mm | 40, 25 x 16mm | 2 off 50,30 x 50, 4 off 50,30 x 40mm |
Insulated 19 Module | 9 off - 40, 25 x 16mm | 40, 25 x 16mm | 6 off - 50, 30 x 50mm |
Insulated 22 Module | 10 off - 40, 25 x 16mm | 40, 25 x 16mm | 2 off 50,30 x 50, 6 off 50,30 x 40mm |
• Positive contact status indication on Switch, MCB, RCD & RCBO provided by green indicator to show contacts are open
Consumer Unit
Enclosures
Bell Transformer
RCD
RCBO
MCB
Contractors
Consumer units for use in domestic household premises
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