Electrical and Industrial | Power management solutions | Eaton 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. No worries, you may use a single Neutral busbar for this purpose. First of all, switch off the main switch or related MCB breaker in the main distribution board or consumer unit and make sure the main supply is turned off. June 10, 2022 5:48 PM PT. fitting los necar . We Rely on Advertising to Help Fund Our Site and Provide Free Information. Split load consumer unit is the combination of RCBO "Residual Current . 163 0 obj <>stream This allows the circuit to be divided into two, usually one upstairs, one down. The output Live terminal of RCD should be bonded to other MCBs via a common copper busbar segment terminal. ENVIRO EBU1. < Consumer Unit Accessories Busbars A busbar is installed within a power distribution board and is designed to connect circuit devices to isolation devices. Advice on installing a consumer unit. This generally applies to higher Amp rated appliances (showers, cookers etc) but it should always be checked with an electrician as to which circuits need to be placed on the RCD side of the consumer unit. 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). The modern consumer unit is the centre, or heart, of the wiring system in the home. RCD +MCB in a single unit. Wylex have no miss busbar connections and quick release technology built into their circuit breakers, RCBO's and AFDDs. How to Wire Combo of 3 & 1-, 400V/230V Distribution Board? HAG VML110. How to Determine the Right Size Capacity of a Subpanel? You can follow me day by day on Facebook, Instagram, Twitter and TikTok lookout for \"GSH Electrical. 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. Before fitting the front cover, check the tightness of all screw type connections, including factory made connections. 46.93 inc vat. How to Wire 120V & 240V Main Panel? The following fig shows how to wire and install single phase 230V load circuits in split load CU. 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. This allows the circuit to be divided into two, usually one upstairs, one down. IEC & UK. Check that all live prods on the devices are fully inserted and located into the live busbar. Generally a "split load" arrangement is used with some circuits protected by the RCD, and others not. All project content written and produced by Mike Edwards, founder of DIY Doctor and industry expert in building technology. Shown in the consumer unit casing above, it is a metal, pressed bar, to which the MCBs clip. A smaller white lead is a functional earth connection. Circuit Protection Consumer Units Accessories, Luceco plcLuceco Distribution CentreStafford Park 1, TelfordShropshire TF3 3BD, Luceco plcCaparo House103 Baker StreetLondon W1U 6LN, {{cats[current_cat].sub_cats[current_subcatOrder][current_subcat].products[current_prodOrder].data.part_no}}, View the rest of the Consumer Units range. It may be used, for example, with a main switch board when mounting an RCD. The photographs are of a split load fuse board. 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). . 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. MCB Retro-Fit Kit - For Use When Installing MCBs Into Old Sentry Consumer Units With Fork Style Busbar. Delivery: Estimated between Fri, 17 Mar and Wed, 22 Mar to 23917. A dual RCD consumer unit can be fitted. A Consumer Unit or Fuseboard is the single most important electrical device in any building. Just as a matter of interest, DIN stands for Deutsche Industrie Norm and, originating in Germany, is any of a series of technical standards, used internationally, to designate electrical connections, film speeds and paper sizes. Search stock photos by tags. Thus, the electrical bus bar collects the electric power at one location. %PDF-1.6 % Mauris laoreet vulputate mauris. This way, the protection to the load points are as follows. We have used the followingIEC wiring color codes for 230V single phase supply voltage applicable in the UK and EU. Similarly, the 32A breaker can be used for electric ranges, electric showers and other high power devices. This item is commonly used in both residential and commercial settings including garages, outhouses and stables. 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. 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. Since the introduction of (BS 7671:2008 incorporating amendment no 1: 2011) 17th Edition IET Wiring Regulations, consumer units in the UK must provide RCD protection to all cables embedded in walls excepting high integrity circuits such as those for burglar alarms or smoke alarms. marketing, promotion, packaging, advertorials, and consumer or merchandising products. Therefore, mixing of brands should generally be avoided and, where unavoidable, care should be taken to ensure that the breaker chosen is a good fit for the busbars. As they are very sensitive, it is not practical to fit one RCD to protect the whole house. If you need to find a tradesperson to get your job done, please try our local search below, Consumer Units Designed for safety, installation and aesthetics. Doing your own electrical work is dangerous as well as illegal in some cases. How to fit a miniature circuit breaker (MCB) or RCBO to a busbar in a consumer unit (fuse box). https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/203078425782. Where the cranked one isnt in the rcd. [2], Some manufacturers have added innovative features such as CPN Cudis who have added a LED strip light to their 'Lumo' consumer unit to enhance visibility in dark locations such as under staircases.[3]. How to Wire and Install an Electrical Outlet Receptacle? Save up to 70% with our image packs. 102 0 obj <> endobj 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 . Never stand or touch wet and metal parts while repairing or installation. endstream endobj 103 0 obj <> endobj 104 0 obj <>/ExtGState<>/Font<>/XObject<>>>/Rotate 0/StructParents 1/Type/Page>> endobj 105 0 obj <>stream . A Split Load Consumer Unit is also known as High Integrity Consumer Unit which contains both RCDs and RCBOs. 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). The split board shown here has one RCD and is a simple version to show the user how the board works. How to Determine the Number of Circuit Breakers in a Panel Board? 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. A smaller white lead is a functional earth connection. Breaker Box Installation. 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. [email protected] How to Wire 240V, 208V & 120V, 1 & 3-Phase, High Leg Delta Main Panel? Please Whitelist Our Website by Allowing Ads, How to Wire 1-Phase Split Load Consumer Unit? Now, connect the service cable (two wires as Phase and Neutral from the utility pole and energy meter) to the single phase two poles main switch. Home > DIY How To Projects and Tutorial Guides > Installing a Consumer Unit Consumer Units Explained. Hager VML110 10 Way RCBO Consumer Unit. Each fuse, or MCB, is clipped onto a DIN bar and the "teeth" of the bus bar are inserted into the MCBs. In the UK, there are four main types of Consumer Unit: Modern consumer units usually use DIN-rail mount breakers. If not applicable, Please follow the local area codes or general practiced color codes related to specific regions. How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel? We Rely on Advertising to Help Fund Our Site and Provide Free Information. Consumer Unit Busbar - 11 Modules. Left one may be correct, but it's too short, the red loop of wire is not acceptable. illinois obituaries 2020 . All images used on this website are subject to copyright Luceco plc and other image rights holders where applicable. When the MCBs are clipped onto the DIN bar, the bus bar is inserted into the live terminal at the bottom of the MCB. Now, mount all the three MCBs (6A, 16A and 32A respectively) and 2-poles RCD (63A) in the built-in din rail in the garage CU. Download this stock image: Necar Zadegan visits the Pull-In showroom for a fitting Los Angeles California - D0N3EA from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Never stand or touch wet and metal parts while repairing or installation. Installation Instructions . Keep in mind that load points and circuits can be connected directly to these two terminals i.e. Please Whitelist Our Website by Allowing Ads. Do not attempt removal or replacement unless you are you are qualified to Part P regulation standards. For use with all Hager Design 10, 30 and 50 consumer units, the, FuseBox F2014MX 14 Way RCBO Consumer Unit + Surge Protection, Enviroburst Automatic Fire Supression System EBU1 195mm, Enviroburst Automatic Fire Supression System EBU2 300mm, Envirograf Intumescent Strip for 18th Edition Consumer Units 150x100mm, Envirograf Intumescent Strip for 18th Edition Consumer Units 300x75mm. %%EOF 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. In electric power distribution, a busbar (also bus bar) is a metallic strip or bar, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution. Get Free Android App | Download Electrical Technology App Now! 0 Fully Loaded Consumer Unit This is a popular solution due to its low cost and comprises a dual RCD board supplied complete with MCBs. or if you are doing it yourself you can find suppliers local to you. 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. The rail and the shape of the front opening are standardized but the busbar arrangements are not. You have done, the electrical appliances now can be connected to the new wired consumer unit and its MCBs via three wires i.e. In short, there should be two phase wires from the same line terminal of MCB. Necar Zadegan visits the Pull-In showroom for a fitting Los Angeles, California - 02.09.10. In this tutorial, we will be showing how to install a single phase garage consumer unit for 230V with RCDs according to IEC. The garage consumer unit would then just have a mains switch and MCBs for each circuit. Grab your copy now for all the DIY help you need right at your finger tips! In addition, for arc fault protection (mentioned first time in the the IET Wiring Regulations 18th edition BS 7671: 2018, AFDD (Arc Fault Detection Device) is the term used in the UK while it is known as AFCI (Arc Fault Circuit Interrupter) in the US. Import charges: Free amount confirmed at checkout. EE-Tools, Instruments, Devices, Components & Measurements, How to Connect Load Circuits in the Garage Consumer Unit, How to Wire Single-Phase, 230V Consumer Unit with RCD? The load points and circuits on the RCD + MCB side can be connected via three wires i.e. Fig 13. %%EOF 4g0OO*u7FuP"YG*:v(A jSnsE)o'TyNX4ob#Fyw+[? 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. Circuit-breaker on left-hand side incorrectly installed with busbar tang/ finger outside the termination clamp RCBOs are a single device which combines a circuit breaker and RCD. Breaker Box Installation. A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). 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. 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. 63A, 3 No of Single Poles MCBs: 6A, 16A & 32A. How to Wire 120V & 240V Main Panel? Notify me of follow-up comments by email. This screws into the earth terminal block (C). Now, connect the output Neutral wire from the main switch (as blue color) to the common Neutral Busbar terminal in the consumer unit. In the tutorials above, We have used the IEC wiring color codes (applicable to EU, UK and other countries) as follows. IEC Wiring Color Codes for 230V, 1-Phase, 3-Wire System: EU & UK, Old UK Wiring Color Codes for Single Phase, 230V AC, Your email address will not be published. hb`````g`e` ",l@0_;V'jl"!se\8:D4p@B@Zf20&b)ab\2u!r6CK\L4h6&nSn0hbX%sPm 4 How to Size a Load Center, Panelboards and Distribution Board? This unit has one main switch, two RCDs and each circuit has it's own MCB. Barrel Lock And Key Set - Suitable For Locking Sentry Consumer Unit Lids. Similarly, connect the Phase or Live wire L (Brown color) to the live terminal of RCD. This can be done in 3 ways. 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. 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. As they must sense the current in both the line and neutral, they have connections for both. A consumer unit is a type of distribution board . How to fit a miniature circuit breaker (MCB) or RCBO to a busbar in a consumer unit (fuse box). A look at RCBOs and how they are fitted into a typical consumer unit. This way, a single phase load circuit is connected through three wires viz Phase, Neutral and Earth wire. For example, the LED lamp and ceiling fan is controlled and protected by RCD + MCBs. Required fields are marked *. This saves you the expense of replacing the entire board when you need to reconfigure electrical circuits. 137 0 obj <>/Encrypt 113 0 R/Filter/FlateDecode/ID[<73D037194761440D82A4DB3A31246358>]/Index[112 47]/Info 111 0 R/Length 121/Prev 631834/Root 114 0 R/Size 159/Type/XRef/W[1 3 1]>>stream Disconnect the power supply (and make sure it is really switched OFF) before servicing, repairing or installing electrical equipment. 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]. Staircase Wiring Circuit Diagram How to Control a Lamp from 2 Places? Select the supplier or trade you require, enter your location to begin your search. You must log in or register to reply here. They are suitable for smaller properties with less complex circuits and are available in a number of 'ways', depending on the manufacturer: Hager: 6 way (VML733H), 10 way (VML755), 12 way (VML766), 16 way (VML716) As with all models in the range, there is ample cable space available even when RCBOs are fitted. The first one for RCBOs common busbar and the second one for RCD and common busbar for associatedMCBs. 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. 112 0 obj <> endobj You can create your listing free at DIYnot Local. == 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. 6181Y Easi-Fit Meter Tails Kit 25mm 3m. consumer unit busbar fitting. Consumer Unit Recessed Kits Data Sheet (.pdf), 8 Module, cover complete with fitted visor and lock, 12 Module, cover complete with fitted visor and lock, 16 Module, cover complete with fitted visor and lock, 19 Module, cover complete with fitted visor and lock, 22 Module, cover complete with fitted visor and lock, Grey Plastic Gland Kit for 1-1.5mm flat cable c/w Flat cable insert, Locknut, Grey Plastic Gland Kit for 2.5-4mm flat cable c/w Flat cable insert, Locknut, Grey Plastic Gland Kit for 2x2.5mm flat cable c/w Flat cable insert, Locknut, Grey Plastic Gland Kit for 6mm flat cable c/w Flat cable insert, Locknut, Adaptor, Grey Plastic Gland Kit for 10-16mm flat cable c/w Flat cable insert, Locknut, Grey Plastic Tails Kit c/w Multiple Inserts, Locknut, Blanking Insert, Grey Plastic Tails Kit c/w Multiple Inserts, Locknut, Blanking Insert, Adaptor, Brass Gland Kit for 1-1.5 flat cable c/w Flat Cable Insert, Locknut, Brass Gland Kit for 1-1.5mm flat cable c/w Flat cable insert, Locknut, Brass Gland Kit for 2x2.5mm flat cable c/w Flat cable insert, Locknut, Brass Gland Kit for 2.5-4mm flat cable c/w Flat cable insert, Locknut, Brass Gland Kit for 10-16mm flat cable c/w Flat cable insert, Locknut, Brass Tails Kit c/w Multiple Inserts, Locknut, Blanking Insert, Brass Tails Kit c/w Adaptor, Multiple Inserts, Locknut, Blanking Insert, Grey Plastic Tails Kit, c/w Multiple Inserts, Locknut, Blanking Insert, Brass Tails Kit, c/w Multiple Inserts, Locknut, Blanking Insert, Consumer Unit Cover Blanks (pack of 10, 5 x pairs), Cable Kit includes neutral and live cables, terminal bar, fixing clip and spare labels (may be used to convert mains switch to split load consumer unit), Cover Lock (to suit all BG Consumer Units which are fitted with a lockable cover), Metal cover lock blank for use with the metal lockable covers after the barrel lock is removed, Ideal during first installation to ensure power isolation, and protect installer, Suitable for restricted space areas due to compact size, Supplied with adjustable brackets and trim, Adjustable brackets enable the consumer unit to be recessed between 42mm and 62mm from the outer surface of the wall, Enables 16 module consumer unit to be recessed into wall, Enables 19 module consumer unit to be recessed into wall, Enables 20 module consumer unit to be recessed into wall, Both Plastic and Brass Glands acceptable due to no set regualtion on cable entry, Tails Glands allow 2 x tails and 1 x earth cable to enter single entry whilst being individually sealed, All glands and grommets satisy IP4X (Maxiumum requirement as per NICEIC guideline sfor all cable entry and exit on horizontal planes), Cable retention negates requirement for additional tails clamp. Staircase Wiring Circuit Diagram How to Control a Lamp from 2 Places? Right busbar is fitted incorrectly - the label end should fit into the RCD, however it's not just a case of turning it round, because it's either the wrong bar, or someone has assembled the consumer unit incorrectly. A consumer unit can use an RCD as the main switch. Here is a detailed explanation of the consumer unit and how it should be installed in the UK. Now connect the Neutral wire N (Blue color) to the input N terminal of RCD. Consumer units have different methods of protecting circuits. (ex. In Stock *N1i5>/d'0I]f]WY`FX3 o<0`CRw/q!9G*0ZR/pu^lvX5V&`2^G". All about Electrical & Electronics Engineering & Technology. Phase from single pole MCB, Neutral from Neutral busbar and Earth wire from the. Even More Electrical Wiring Installation & Tutorials, A Complete Guide About Solar Panel Installation. Doing your own electrical work is dangerous as well as illegal in some cases. The output N terminal of RCD should be connected to the Neutral busbar terminal in the consumer unit. RCD+RCBO, How to Wire 230V Dual Split Load Consumer Unit? 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 %PDF-1.4 % ), and how much protection is required for each circuit. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? The unit distributes the electricity, via fuses of one kind or another, to the different circuits in the house. To connect the rated MCBs and RCD in the garage consumer unit for specific appliances, follow the following simple steps. Brown as Live L, Blue as Neutral N and Protective Earth E as Green with Yellow Stripe. If a fault develops on one circuit, all circuits would be switched off immediately. 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. 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. 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. Additionally, connect the single pole MCB to RCD through a common busbar segment as shown in fig. 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. endstream endobj startxref Nullam ultricies malesuada dignissim. Be careful because its all about electricity and electricity is too dangerous. It May Be Used To Fit Up To Three New Sentry MCBs. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? A consumer unit can use an RCD as the main switch. You are here:BG Electrical Split load consumer unit is the combination of RCBO Residual Current Breaker with Over-Current, RCD Residual Current Device and MCB Miniature Circuit Breaker. The box pictured top-right is a "Wylex standard" fitted with rewirable fuses. The Current ratings which MCBs are designated to deal with are now conforming to the international equivalent of our old imperial ratings.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'diydoctor_org_uk-leader-2','ezslot_14',810,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-leader-2-0'); This standard is called the Renard current rating and supercedes the imperial ratings as far as MCBs are concerned. 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. 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. Click here for more information. How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel? 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. Wylex have no miss busbar connections and quick release technology built into their circuit. This page was last edited on 12 January 2023, at 10:04. We will be using the IEC wiring color codes which is also applicable to EU, UK and other countries. 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. In single phase supply, the voltage between phase and neutral is 230V AC. The use of RCDs is necessary, on two occasions, to meet the wiring regulations.