The output Live terminal of RCD should be bonded to other MCBs via a common copper busbar segment terminal. Wiring a Garage Consumer Unit with RCD & Connecting 1-, 230V Load Points in it. This allows the circuit to be divided into two, usually one upstairs, one down. (14 Available), 10.80 This then becomes a split load consumer unit and is shown above. This example has a flying lead for the incoming neutral connection and a standard terminal for the line busbar. The choice of consumer unit will reflect several factors such as the size and layout of the dwelling, number of floors, outbuildings, the expected load levels (ovens, showers, immersion heaters, electric blankets, car-chargers etc. Design 10 Design 10 is our board for all applications. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'diydoctor_org_uk-medrectangle-3','ezslot_7',823,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-medrectangle-3-0');We will deal with the two main types of consumer unit found in the home today. Read carefully all the cautions and instructions and follow them strictly while doing this tutorial or any other work in practical related to electrical works. The photographs are of a split load fuse board. In Stock Nulla vel ex eget lacus imperdiet mattis convallis quis leo. The author will not be liable for any losses, injuries, or damages from the display or use of this information or if you try any circuit in wrong format. Get Free Android App | Download Electrical Technology App Now! All project content written and produced by Mike Edwards, founder of DIY Doctor and industry expert in building technology. Brown as Live L, Blue as Neutral N and Protective Earth E as Green with Yellow Stripe. A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). EE-Tools, Instruments, Devices, Components & Measurements, Split Load Consumer Unit Wiring Old UK Wiring Color Codes, Wiring 230V Single Phase Circuits in a Split Load Consumer Unit, differences between MCB, MCCB, ELCB & RCB, RCD or RCCB/RCBO Circuit Breakers, How to Wire Single-Phase, 230V Consumer Unit with RCD? You are using an out of date browser. Consumer units have different methods of protecting circuits. If only a small amount of load points are needed to power up through mains supply, they install a garage consumer unit instead of larger consumer units especially in outbuildings. What is a 12v bus bar? Consumer Unit Busbar - 11 Modules. Staircase Wiring Circuit Diagram How to Control a Lamp from 2 Places? 0 We Rely on Advertising to Help Fund Our Site and Provide Free Information. How to Fit a Circuit Breaker (MCB RCBO) to a Busbar. Wylex No Miss The second condition applies to any circuits where an earth fault current is not sufficient to blow the fuse, or trip the switch, in the designated time allowance made in the regulations. Required fields are marked *. You may need more about the protection devices in the previous post under the title of differences between MCB, MCCB, ELCB & RCB, RCD or RCCB/RCBO Circuit Breakers. Hager VAB16 16 Module Busbar - Consumer Unit World The cosumer unit did not have any spare busbar so I used a piece of 6mm insulated cable to link the last mcb with the busbar in to the new mcb. I think it was either a loose connection or dust/dirt in the connection. A consumer unit is a type of distribution board (a component of an electrical power system within which an electrical power feed provides supply to subsidiary circuits). A Garage Consumer is a type of consumer unit and distribution board (aka mini consumer unit) used to extend and provide electric supply to the exterior buildings such as shed, workshop or other outdoor installations in the garage. For example, the LED lamp and, LED lamp & ceiling fan are protected by Main Switch => RCD => Single Pole MCB, Ceiling Fan & Socket Outlet Protected by Main Switch => RCBO = (RCD + MCB), IEC Wiring Color Codes 1-, 230V UK & EU. This allows the circuit to be divided into two, usually one upstairs, one down. consumer unit busbar fitting. Usually this type of consumer unit also allows for fully flexible configuration, meaning there is no restriction on the number of RCBOs used. Cheers E ElectekAir Well-known member Joined Jul 3, 2008 Messages 449 Reaction score 0 Jul 11, 2012 #2 102 0 obj <> endobj Before fitting the front cover, check the tightness of all screw type connections, including factory made connections. UK & IEC Wiring Color Codes Single Phase Supply, Your email address will not be published. How to Wire a Garage Consumer Unit? - ELECTRICAL TECHNOLOGY Generally, there is a 40A, 2-Poles, Two Poles RCD (Residual Current Device). For use with all Hager Design 10, 30 and 50 consumer units, the VAB16 16 module busbar may be cut to suit any board. Necar Zadegan visits the Pull-In showroom for a fitting Los Angeles Located in: bromley, Kent, United Kingdom. To do so, switch off the main switch in the main consumer unit or distribution board. == Time Stamps - Cut to the action ==00:00 - Fitting MCBs or RCBOs to a bus bar00:33 - No miss bus bar technology 01:01 - Bottom of the RCBO bus bar demonstration 01:25 - Quick release technology01:52 - Fitting an RCBO into a consumer unitVideos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E. It may not display this or other websites correctly. A dual RCD consumer unit can be fitted. Required fields are marked *. k'(Pr} DtD&}C{u*3Ym,dzWHo+H9wKCf.}tOGn1>P|p[}1s`91bLldsi_>-NM2'fiHKYw4+\Gl{(A,?zC "G>E a^ Contact the licensed electrician or the. Phase from single pole MCB, Neutral from Neutral busbar and Earth wire from the Earthing/Grounding busbar. Let us help you find a tradesman local to you. Please also see our project on the New Wiring and Cable Colours. When screwed tight this gives live feed to all the MCBs.Consumer Unit with MCBs and Bus Bar. Circuit-breaker on left-hand side incorrectly installed with busbar tang/ finger outside the termination clamp How to Wire 240V, 208V & 120V, 1 & 3-Phase, High Leg Delta Main Panel? Corridor Wiring Circuit Diagram Hallway Wiring using 2-Way Switches, Tunnel Wiring Circuit Diagram for Light Control using Switches, Hospital Wiring Circuit for Light Control using Switches, Hotel Wiring Circuit Bell Indicator Circuit for Hotelling, Hostel Wiring Circuit Diagram and Working, Godown Wiring Diagram Tunnel Wiring Circuit and Working. Phase, Neutral and Protective Earth. Please check your inbox to confirm your subscription. Now connect the Neutral wire N (Blue color) to the input N terminal of RCD. An RCD is a manually operated isolator switch, but it is also an automatic safety device that will trip and cut off as soon as it senses an earth fault. The first one is a single load fuse board where the power coming in is taken through a double pole switch to a live bus bar. %%EOF The output N terminal of RCD should be connected to the Neutral busbar terminal in the consumer unit. Necar Zadegan visits the Pull-In showroom for a fitting Los Angeles, California - 02.09.10. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Enter Your Email Address to Subscribe to this Blog and Receive Notifications of New Posts by Email. To control the ON/OFF operation of the electrical appliances, an SP or DP switchescan be used in the sub circuits and final sub circuits. Less common than the other types, an RCD incomer does not use a main switch. In the image below, this shows the live (K) and neutral (J) coming into the main double pole switch from the meter. everything had been moved along 1 creating a space for a rcbo feeding garage, Woman admitted her ex had done the garage job himself so no certs or testing. They simply push on via a spring loaded lock at their back. Installation Instructions . How to fit a miniature circuit breaker (MCB) or RCBO to a busbar in a consumer unit (fuse box). Keep up to date with our DIY projects, tips and latest deals, DIY Doctor Ltd, The Workshop, Newbury Works, Somerset, BA3 5RX, DIY Doctor Ltd 2023 All Rights Reserved, Company Number: 05863375 | VAT Number: 811134774. Electrical Bus-Bar and its Types - Circuit Globe They are usually used as a sub-board to a main distribution panel. Never stand or touch wet and metal parts while repairing or installation. This way, a single phase load circuit is connected through three wires viz Phase, In a combination of RCD + RCBO distribution board or single phase 230V split load consumer unit, the load circuits should be connected via three wires i.e. How to Wire 240V, 208V & 120V, 1 & 3-Phase, High Leg Delta Main Panel? In addition, RCD protection is a must in the consumer unit according to the IEC and IET: 17th edition BS-7671. Nullam ultricies malesuada dignissim. You can install the electrical component directly onto a brick or plaster wall. In this video I demonstrate how to fit a Wylex miniature circuit breaker and then show how easy it is to remove it from the busbar. The single pole MCBs and associated circuits are protected and controlled by the RCDs side while the RCBOs are controlled by the main switch side. RCDs also work by detecting an imbalance between the Live and the Neutral conductors and this feature is a requirement for all Class 2 double insulated equipment. In the above case, you may connect the lighting points to the 6A MCB while the dual socket (for immersion heaters or dedicated freezer circuits) to the 16A MCB. It protects electrical appliances from damage and more importantly, human beings from electrical shock. Installing a Consumer Unit Consumer Units Explained, General Building, Self Build and Renovation, Planning Regs, Project Management and Safety, Let us help you find a tradesman local to you, How to Wire a Junction Box for Socket and Light Circuits, Electrical Lighting Circuit How to Wire a Light, Extending a Ring Main and Adding more Sockets to a Room, Understanding Electrical Cables and Flexes, How to Connect and Wire up Armoured Cable or SWA Cable, Which Electric Cables To Use Around The Home, How To Wire A Lighting Circuit From The Consumer Unit, Electrical Wiring - How To Wire A Junction Box To Extend Circuits For Sockets And Lights, How To Extend A Ring Main From The Consumer Unit, A 5 amp fuse can be replaced with a 6 amp MCB. The FE should be connected to the main earth terminal block while the N as neutral should be connected to the main neutral terminal. Consumer Units . In the tutorials above, We have used the IEC wiring color codes (applicable to EU, UK and other countries) as follows. hbbd```b``6 i#dGA${0 a} ">` WDrEuAdv f.bc*":`Rl&XY,, fHm;A `3 Consumer Unit Accessories | Meteor Electical Grab your copy now for all the DIY help you need right at your finger tips! consumer unit bus bar query | DIYnot Forums Follow, Copyright 2023, All Rights Reserved 2012-2023 by, Looks Like You're Using an Ad Blocker. Shown in the consumer unit casing above, it is a metal, pressed bar, to which the MCBs clip. 112 0 obj <> endobj It is because split load consumer units provide protection against overload, overcurrent & short-circuit and earth leakage. Contact the licensed electrician or the, The distribution board should not be installed 2.2 meter above the floor, must be protected from the corrosion and away from watery areas. Ashley consumer units, anuone got any breakers. 22.13 inc vat. Reproduction prohibited unless prior permission is granted by Luceco plc in writing. Corridor Wiring Circuit Diagram Hallway Wiring using 2-Way Switches, Tunnel Wiring Circuit Diagram for Light Control using Switches, Hospital Wiring Circuit for Light Control using Switches, Hotel Wiring Circuit Bell Indicator Circuit for Hotelling, Hostel Wiring Circuit Diagram and Working, Godown Wiring Diagram Tunnel Wiring Circuit and Working. This way, a single phase load circuit is connected through three wires viz Phase, Neutral and Earth wire. . Looks Like You're Using an Ad Blocker. Do not attempt removal or replacement unless you are you are qualified to Part P regulation standards. Environmental and energysaving LED lighting, Interior and exteriorportable power solutions, Audio visual andhome entertainment products, UK Customer Services: +44 (0)1952 238 100. In addition, connect the RCD to the output phase wire of the main switch through jumper wire(as brown color). Generally, there is a 40A, 2-Poles RCD and other related circuit breakers such as 6A, 16A, 32A MCB (circuit breakers) based on the system requirements. MK Sentry Consumer Unit Accessories - PEW Electrical RCD (Residual Current Device) and RCBO (Residual Current Device) is the term used in the UK while the same protection device named as GFCI (Ground Fault Circuit Interrupter), GFI (Ground Fault Interrupter), LCDI (Leakage Current Detection Interrupter) and ALCI (Appliance Leakage Current Interrupter). %PDF-1.4 % In addition, the earth wire should be connected from the main earth terminal. In this tutorial, we will be showing how to install a single phase garage consumer unit for 230V with RCDs according to IEC. IEC, UK & EU, Wiring of the Distribution Board with RCD, Wiring of the Distribution Board without RCD, Single Phase Electrical Wiring Installation in Home NEC & IEC, Three Phase Electrical Wiring Installation in Home NEC & IEC, Single-Phase Electrical Wiring installation in a Multi-Story Building, 3-Phase & 1-Phase Electrical Distribution Wiring Installation in Multistory Building. Electrical and Industrial | Power management solutions | Eaton Instructions on wiring a consumer unit to UK specifications for dual RCD and RCBO consumer units. It is also an offence to interfere with the seals on the electricity meter. The United Kingdom was using their own wiring color codes (prior April, 2004) while some countries are still following the same old UK wiring color code. You can create your listing free at DIYnot Local. The earth (N*), which has been left unsheathed for clarity, goes into the earth terminal block (C). This way, the light bulbs will still glow if a fault occurs on the three pin socket which will trip the desired MCB. We love feedback on our DIY tutorials it helps us to make them the best they possibly can be so if you have any comments you would like to share with us, click the button below and let us know. Barrel Lock And Key Set - Suitable For Locking Sentry Consumer Unit Lids. K5593S. For example, the LED lamp and ceiling fan is controlled and protected by RCD + MCBs. VAT), Unit 34, Chess Business Park, Moor Road, Chesham, HP5 1SD, Thank you for signing up to our newsletter. Vestibulum in blandit enim. How to Wire Combo of 3 & 1-, 400V/230V Distribution Board? RCBOs are a single device which combines a circuit breaker and RCD. Moreover, having sockets and lights on alternate RCD's means that if a faulty kettle downstairs trips that RCD for example, the kitchen lights will still be available, avoiding the hazard of investigating the fault in darkness. No you cant use other brands with the exception of Crabtree ones that look the same. So please! A garage fuse box is simple to install, troubleshoot and repair due to the simplicity and basic design with top hinged door. Moreover, connect the output Phase wire from the main switch to the RCBOs via common busbar segment. How to fit a miniature circuit breaker (MCB) or RCBO to a busbar in a consumer unit (fuse box). Thus, the electrical bus bar collects the electric power at one location. The box pictured top-right is a "Wylex standard" fitted with rewirable fuses. Consumer Units Designed for safety, installation and aesthetics. Similarly, connect the Phase or Live wire L (Brown color) to the live terminal of RCD. Now, connect the output Neutral wire from the main switch (as blue color) to the common Neutral Busbar terminal in the consumer unit. 1x 63A 30mA RCD 2x Type B MCB (1 x 32A, 1 x 6A) Dimensions: 185 (H) x 127 (W) x 110 (D)mm BS 7671 IET Amendment 3 BS 61439-3 It has been suggested that this article be, IET Wiring Regulations Seventeenth Edition - British Standard BS7671:2008, Part 2 Definitions, "Google search on UK availability of Modern breakers for older consumer units", "Innovative Bury company recognised with three award nominations", https://en.wikipedia.org/w/index.php?title=Consumer_unit&oldid=1133121403, Creative Commons Attribution-ShareAlike License 3.0, Main Switch Consumer Unit - Offers highest degree of circuit separation as all circuits must be protected from earth leakage independently. The unit distributes the electricity, via fuses of one kind or another, to the different circuits in the house. Outputs are via two terminals on the top of the device. All about Electrical & Electronics Engineering & Technology. Here is a detailed explanation of the consumer unit and how it should be installed in the UK. Search stock photos by tags. A split load board is designed for total safety and incorporates an RCD (Residual Current Device, shown as E in the picture above) as well as the double pole switch (D). Comb busbar in consumer unit - Electricians Forums This item is commonly used in both residential and commercial settings including garages, outhouses and stables. Even More Electrical Wiring Installation & Tutorials, A Complete Guide About Solar Panel Installation. A dual RCD consumer unit can be fitted. An information label near the consumer unit explains this. endstream endobj 103 0 obj <> endobj 104 0 obj <>/ExtGState<>/Font<>/XObject<>>>/Rotate 0/StructParents 1/Type/Page>> endobj 105 0 obj <>stream How to Wire 120V & 240V Main Panel? This unit has one main switch, two RCDs and each circuit has its own MCB. RCBO & Arc fault protection is recommended in the 18th Edition 2018. Axiom Metal Garage Consumer Unit 2 Way | Toolstation Save up to 70% with our image packs. High Integrity Consumer Unit - Usually used in larger properties with greater numbers of circuits, this type of consumer unit offers good circuit separation through the use of two or more RCDs whilst allowing for the independent use of RCBOs. Each circuit cable is fed into the consumer unit and connected to an MCB of the appropriate rating.Live connected to MCB with neutral going to RCD neutral terminal block, Live connected to MCB with neutral going to RCD neutral terminal block, For regulations governing heights of sockets etc, please click hereElectrical Wiring Domestic book Available from AmazonWiring and Lighting Book Available from Amazon, Electrical Wiring Domestic book Available from Amazon, Wiring and Lighting Book Available from Amazon. ho8lU *Gt*~E@T7ch6{MF.#]NV*dP\WB-d`*&J#C}x8@A[,R} \j"|#O 8'o{4]XSK]cx=DRm EfhwHt.hC6ptHP W^ABk This range of consumer units give the flexibility of choice of incoming arrangement and with the added inclusion of an SPD to be compliant with the 18th Edition Wiring Regulations BS7671. A smaller white lead is a functional earth connection. How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel? 63A, 3 No of Single Poles MCBs: 6A, 16A & 32A. Fully Loaded Consumer Unit This is a popular solution due to its low cost and comprises a dual RCD board supplied complete with MCBs. Postage: 23.73Expedited Deliveryto United States via eBay's Global Shipping Programme. In a combination of RCD + RCBO distribution board or single phase 230V split load consumer unit, the load circuits should be connected via three wires i.e. Search stock photos by tags. For a better experience, please enable JavaScript in your browser before proceeding. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'diydoctor_org_uk-medrectangle-4','ezslot_9',824,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-medrectangle-4-0');The cables to the house circuits are connected to the other side of the MCBs. This example has a flying lead for the incoming neutral connection and a standard terminal for the line busbar. Burnt Busbar on Domestic Consumer Unit - Screwfix Community Forum The CU never tripped and it and the MCB's are not overloaded. Posted on June 29, 2022 in gabriela rose reagan. The older fuse wires are being replaced gradually by their modern equivalent, the MCB or miniature circuit breaker. Disconnect the power supply (and make sure it is really switched OFF) before servicing, repairing or installing electrical equipment. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? Although more expensive than a consumer unit with one or two RCDs and separate circuit breakers, RCBOs have the advantage that a fault will only affect a single circuit . In the image below, we show the earth cable from the meter (L). Doing your own electrical work is dangerous as well as illegal in some cases. As this option is expensive it is only usually used where space is tight for the enlargement of a consumer unit as has to happen when updating to a dual RCD unit. K5511S. Also, dont connect the lighting points and three pin sockets to the same MCB. We also show how a circuit cable is introduced to the unit. Mauris laoreet vulputate mauris. First of all, disconnect the Fuse between kWH energy meter and the utility pole to cut-off the main power supply. It's easy to connect your consumer unit to an isolation device with this Busbar 10 Module. Definition: An electrical bus bar is defined as a conductor or a group of conductor used for collecting electric power from the incoming feeders and distributes them to the outgoing feeders.In other words, it is a type of electrical junction in which all the incoming and outgoing electrical current meets. Another way to protect circuits under the 17th Edition IET Wiring Regulations is by fitting Residual Current Circuit Breaker With Overload (RCBOs) to every circuit, and although this is more costly than the RCD+MCB's option, it means any fault condition on a circuit trips only that circuit's RCBO, so the search for the fault is narrowed down from the start. HAG VML110. If a fault develops on one circuit, all circuits would be switched off immediately. Additionally, connect the single pole MCB to RCD through a common busbar segment as shown in fig. The top mounted terminal rail makes the wiring of the neutral and earth connections neat and simple. Consumer Unit Accessories | Consumer Units | BG Electrical Notify me of follow-up comments by email. %PDF-1.6 % All images used on this website are subject to copyright Luceco plc and other image rights holders where applicable. This protects all areas including showers and cookers, but if one trips the other will ensure at least some lights and some sockets still work. *N1i5>/d'0I]f]WY`FX3 o<0`CRw/q!9G*0ZR/pu^lvX5V&`2^G". Im more worried about the one on the right. The United Kingdom is following IEC wiring color codes now. The same wiring of split load consumer unit for RCD and RCBOs is shown in the following fig having the old UK wiring color codes (prior 2004). A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). All cables and connections to the consumer unit must be checked and tested by a qualified electrician. There are two built-in wires namely FE Functional Earth as white colored wire and N Neutral as blue colored wire. How to Wire 120V Water Heater Thermostat Non-Simultaneous? There are a number of different ratings for current and sensitivities to current leakage available, so you will need to understand which are the appropriate ratings for your home. Calculator, How to Calculate the Battery Charging Time & Battery Charging Current Example, Automatic UPS / Inverter Wiring & Connection Diagram to the Home, How To Calculate Your Electricity Bill. consumer unit busbar fitting British General Consumer Unit 10-Wege Dual RCD MCB bevlkert The split board shown here has one RCD and is a simple version to show the user how the board works. Staircase Wiring Circuit Diagram How to Control a Lamp from 2 Places? How to Wire and Install an Electrical Outlet Receptacle? All of this is explained more thoroughly when we deal with the second type of unit, which is the split load unit. Your email address will not be published. Hager VML110 10 Way RCBO Consumer Unit. Yes, that is a bus bar and there is also a shorter bus-bar on the left. This allows protection in full for all individual circuits and if one trips, all others will still work. < Consumer Unit Accessories Busbars A busbar is installed within a power distribution board and is designed to connect circuit devices to isolation devices. RCD Incomer Consumer Unit. When the MCBs are clipped onto the DIN bar, the bus bar is inserted into the live terminal at the bottom of the MCB. Delivery: Estimated between Fri, 17 Mar and Wed, 22 Mar to 23917. How to Wire 120V Water Heater Thermostat Non-Simultaneous? June 10, 2022 5:48 PM PT. 137 0 obj <>/Filter/FlateDecode/ID[<85A5253DFD47C74748F4D751B9EBAC1A><0D20996C19DAF84BB25371BA76E38319>]/Index[102 62]/Info 101 0 R/Length 150/Prev 1202644/Root 103 0 R/Size 164/Type/XRef/W[1 3 1]>>stream Pre-pay for multiple images and download on demand. A smaller white lead is a functional earth connection. The following fig shows how to wire and install single phase 230V load circuits in split load CU. We will be using the IEC wiring color codes which is also applicable to EU, UK and other countries. Governor Newsom today also announced $47 million in housing grants to create more residential care options for seniors and adults with disabilities, including people at risk of or experiencing homelessness.These grants are the first to be awarded through the new Community Care Expansion (CCE) - Capital Expansions Grants Program. Necar Zadegan visits the Pull-In showroom a fitting Los Angeles RCDs have a test button which creates an earth leak with a resistor, and it is usually recommended that they are tested once a month. Similarly, the 32A breaker can be used for electric ranges, electric showers and other high power devices. In single phase supply, the voltage between phase and neutral is 230V AC. The IET defines a consumer unit, also known as a consumer control unit or electricity control unit, as "a particular type of distribution board comprising a type-tested co-ordinated assembly for the control and distribution of electrical energy, principally in domestic premises, incorporating manual means of double-pole isolation on the incoming circuit(s) and an assembly of one or more fuses, circuit breakers, residual current operated devices or signalling and other devices proven during the type-test of the assembly as suitable for use."[1]. Home > DIY How To Projects and Tutorial Guides > Installing a Consumer Unit Consumer Units Explained. How to Wire 277V & 480V, 1-Phase & 3-Phase, Commercial Main Service Panel? Advice on installing a consumer unit. The protection devices in a split load CU do the following jobs. Good to know: According to IET (Institution of Engineering and Technology) wiring regulations: 17th Edition (BS 7671:2008 1: 2011), an RCD protection must be provided in the consumer unit except smoke and burglar alarms system. ENVIRO EBU1. 9.00 BG is a registered trademark and member of the Luceco plc group of companies. Phase from single pole MCB, Neutral from Neutral busbar and Earth wire from the. Are you a trade or supplier? fitting los necar . Read carefully all the cautions and instructions and follow them strictly while doing this tutorial or any other work in practical related to electrical works.
consumer unit busbar fitting