For load circuits wiring, there are two terminals on the output side of an RCBO viz Phase and Neutral. The modern consumer unit is the centre, or heart, of the wiring system in the home. Please check your inbox to confirm your subscription. It is because split load consumer units provide protection against overload, overcurrent & short-circuit and earth leakage. 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. Just wanted to check this is ok? A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). Necar Zadegan visits the Pull-In showroom for a fitting Los Angeles, California - 02.09.10. Consumer Unit Busbar - 20 Modules. Ashley consumer units, anuone got any breakers. Generally, there is a 40A, 2-Poles, Two Poles RCD (Residual Current Device). Outputs are via two terminals on the top of the device. So please! Even More Electrical Wiring Installation & Tutorials, A Complete Guide About Solar Panel Installation. How to Wire 240V, 208V & 120V, 1 & 3-Phase, High Leg Delta Main Panel? Whilst each installation requires individual design and set up there are highly standardised and regulated approaches to configuration. endstream endobj startxref This rule pretty much covers every single socket in the house so the ring main should be placed on the RCD protected side of the consumer unit. In the image below, this shows the live (K) and neutral (J) coming into the main double pole switch from the meter. All images used on this website are subject to copyright Luceco plc and other image rights holders where applicable. BG is a registered trademark and member of the Luceco plc group of companies. 6181Y Easi-Fit Meter Tails Kit 25mm 3m. All the. 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. administered by the California Department of Social Services to . Shown in the consumer unit casing above, it is a metal, pressed bar, to which the MCBs clip. For example, the LED lamp and ceiling fan is controlled and protected by RCD + MCBs. Each fuse, or MCB, is clipped onto a DIN bar and the "teeth" of the bus bar are inserted into the MCBs. Consumer Units Designed for safety, installation and aesthetics. 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. 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. K5593S. 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. Barrel Lock And Key Set - Suitable For Locking Sentry Consumer Unit Lids. A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). This can also be an expensive solution as it necessarily uses, Dual RCD Consumer Unit - Offers a cost-effective solution to meet 17th Edition Regulations by protecting two banks of circuits from earth leakage through the use of two. A consumer unit can use an RCD as the main switch. *N1i5>/d'0I]f]WY`FX3 o<0`CRw/q!9G*0ZR/pu^lvX5V&`2^G". This screws into the earth terminal block (C). How to Wire 120V & 240V Main Panel? Your email address will not be published. A consumer unit can use an RCD as the main switch. Phase from single pole MCB, Neutral from Neutral busbar and Earth wire from the. In addition, the earth wire should be connected from the main earth terminal. How to fit a miniature circuit breaker (MCB) or RCBO to a busbar in a consumer unit (fuse box). 0 Contact the licensed electrician or the. How to Wire 120V Water Heater Thermostat Non-Simultaneous? Split load consumer unit is the combination of RCBO Residual Current Breaker with Over-Current, RCD Residual Current Device and MCB Miniature Circuit Breaker. . [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]. We Rely on Advertising to Help Fund Our Site and Provide Free Information. How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel? 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. 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 box pictured top-right is a "Wylex standard" fitted with rewirable fuses. k'(Pr} DtD&}C{u*3Ym,dzWHo+H9wKCf.}tOGn1>P|p[}1s`91bLldsi_>-NM2'fiHKYw4+\Gl{(A,?zC "G>E a^ Ensure that all devices are engaged correctly on the DIN rail. Required fields are marked *. For a better experience, please enable JavaScript in your browser before proceeding. Hager VML110 10 Way RCBO Consumer Unit. hb`````g`e` ",l@0_;V'jl"!se\8:D4p@B@Zf20&b)ab\2u!r6CK\L4h6&nSn0hbX%sPm 4 In this tutorial, we will be showing how to install a single phase garage consumer unit for 230V with RCDs according to IEC. It protects electrical appliances from damage and more importantly, human beings from electrical shock. 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. 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. 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 care should be taken to ensure that the breaker chosen is a good fit for the busbars. As U.S. inflation hit a four-decade high, rising prices in Southern California where costs of shelter and food are among the highest in the nation are warping the . It is also an offence to interfere with the seals on the electricity meter. You can install the electrical component directly onto a brick or plaster wall. 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. Donec ex felis, scelerisque ut facilisis et, convallis nec magna. Moreover, connect the output Phase wire from the main switch to the RCBOs via common busbar segment. Keep in mind that we have usedIEC wiring color codesfor illustration purposes only. You have done, the electrical appliances now can be connected to the new wired consumer unit and its MCBs via three wires i.e. It may be used, for example, with a main switch board when mounting an RCD. 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. Click here for more information. Black for Neutral, Red for Phase or Hot and Green for earthing. 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. %%EOF We will be using the IEC wiring color codes which is also applicable to EU, UK and other countries. In short, there should be two phase wires from the same line terminal of MCB. Brown as Live L, Blue as Neutral N and Protective Earth E as Green with Yellow Stripe. Keep in mind that load points and circuits can be connected directly to these two terminals i.e. VAT), Unit 34, Chess Business Park, Moor Road, Chesham, HP5 1SD, Thank you for signing up to our newsletter. 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. 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? The case is a little bit different in case of RCBOs as follows. Batten Fittings Site Lighting Bathroom Lighting Lamps & Tubes LED Compact Fluorescent LED Compact Fluorescent Motion Detectors Lighting Accessories Sockets, Switches & Data Switches & Sockets Zahler Square Edge Pearl Slimline Brushed Chrome Black Nickel Antique Brass Metal Clad Connect Grid Modules Euro Modules & Accessories Nullam ultricies malesuada dignissim. Examples in Imperial & Metric System, Working of Electric Mosquito Killer Racket / Fly Swatter Bat. Now, connect the output Neutral wire from the main switch (as blue color) to the common Neutral Busbar terminal in the consumer unit. JavaScript is disabled. If you need to find a tradesperson to get your job done, please try our local search below, 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. For load circuits wiring, there are two terminals on the output side of an RCBO viz Phase and Neutral. Split load consumer unit is the combination of RCBO "Residual Current . %PDF-1.6 % This would, most often, leave you in the unnecessary position of having no lights or power. How to Determine the Number of Circuit Breakers in a Panel Board? Starbreaker consumer units are available as factory built units or for on site assembly in 102 0 obj <> endobj no need to connect the Neutral wire from the main neutral terminal in the consumer unit. Located in: bromley, Kent, United Kingdom. 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. Please see our project on Part P of the building regulations for information on DIY Electrical Installation. Consumer Unit Busbar - 11 Modules. Usually this type of consumer unit also allows for fully flexible configuration, meaning there is no restriction on the number of RCBOs used. 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. Additionally, connect the single pole MCB to RCD through a common busbar segment as shown in fig. I have installed a new mcb in my consumer unit. Phase, Neutral and Protective Earth. Copyright 2008-2023 Flameport Enterprises Ltd - - Terms & Conditions - Contact details - Author: John Ward. 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 endstream endobj 103 0 obj <> endobj 104 0 obj <>/ExtGState<>/Font<>/XObject<>>>/Rotate 0/StructParents 1/Type/Page>> endobj 105 0 obj <>stream 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. RCBOs are a single device which combines a circuit breaker and RCD. Entdecke British General Consumer Unit 10-Wege Dual RCD MCB bevlkert in groer Auswahl Vergleichen Angebote und Preise Online kaufen bei eBay Kostenlose Lieferung fr viele Artikel! Keep in mind that load points and circuits can be connected directly to these two terminals i.e. A Consumer Unit or Fuseboard is the single most important electrical device in any building. or if you are doing it yourself you can find suppliers local to you. You simply plug the electronic component into the bottom of your circuit board and secure it in place. 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. Doing your own electrical work is dangerous as well as illegal in some cases. How to Wire 240V, 208V & 120V, 1 & 3-Phase, High Leg Delta Main Panel? endstream endobj 113 0 obj <>>>/Filter/Standard/Length 128/O(v#,b+F@:DT\r43O)/P -1324/R 4/StmF/StdCF/StrF/StdCF/U(]k$SGEO )/V 4>> endobj 114 0 obj <. 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. As with all models in the range, there is ample cable space available even when RCBOs are fitted. %%EOF The resistor passes more current than that required for tripping, and the duration of the test is not limited, so testing in this way does not provide proof that the unit is working to specification. A look at RCBOs and how they are fitted into a typical consumer unit. 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 Consumer unit for installation with rcds. The rail and the shape of the front opening are standardized but the busbar arrangements are not. 63A, 3 No of Single Poles MCBs: 6A, 16A & 32A. 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. 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. Never stand or touch wet and metal parts while repairing or installation. See details. Consumer units have different methods of protecting circuits. Circuit-breaker on left-hand side incorrectly installed with busbar tang/ finger outside the termination clamp 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. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/203078425782. 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. Be careful because its all about electricity and electricity is too dangerous. If a fault develops on one circuit, all circuits would be switched off immediately. no need to connect the Neutral wire from the main neutral terminal in the consumer unit. How to Wire and Install an Electrical Outlet Receptacle? The split load consumer unit is a safest panel box as compared to simple main switch, simple RCD type consumer unit or dual RCD's consumer unit. Breaker Box Installation. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? Design 10 Design 10 is our board for all applications. Get Free Android App | Download Electrical Technology App Now! ), and how much protection is required for each circuit. Save up to 70% with our image packs. On a job today and in a consumer unit came across a split load board with usual cables from bottom of main switch to rcds. The first of these is to protect any socket which may be reasonably expected to supply equipment outside the house (Strimmers, lawn mowers, hedge trimmers, pond pumps, sheds, lights etc etc). This then becomes a split load consumer unit and is shown above. Im more worried about the one on the right. Here is a detailed explanation of the consumer unit and how it should be installed in the UK. Keep in mind that RCD should be properly installed i.e. A dual RCD consumer unit can be fitted. It's easy to connect your consumer unit to an isolation device with this Busbar 10 Module. The load points and circuits on the RCD + MCB side can be connected via three wires i.e. This will protect all circuits but if the RCD trips, so do all circuits. They are usually used as a sub-board to a main distribution panel. fitting los necar . Posted on June 29, 2022 in gabriela rose reagan. Vestibulum in blandit enim. Advice on installing a consumer unit. Your email address will not be published. These boxes can also be fitted with cartridge fuses or miniature circuit breakers (MCBs). For example, a dual split-load consumer unit can be arranged in a two-story dwelling as follows: By arranging the circuits like this, power will still be present on one of the floors if only one RCD trips out. This example has a flying lead for the incoming neutral connection and a standard terminal for the line busbar. 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. MCB Retro-Fit Kit - For Use When Installing MCBs Into Old Sentry Consumer Units With Fork Style Busbar. 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. 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 first one for RCBOs common busbar and the second one for RCD and common busbar for associatedMCBs. In addition, for arc fault protection (mentioned first time in the the IET Wiring Regulations 18th edition BS 7671: 2018, The load points and circuits on the RCD + MCB side can be connected via three wires i.e. June 10, 2022 5:48 PM PT. As they are very sensitive, it is not practical to fit one RCD to protect the whole house. Fig 13. hbbd```b``1A$v0D2HVf"92@$X ~:9&9A$7X @e:d;$ '5H~ m`00-@ M 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. RCDs can also be switched off manually and can take the place of the isolator switch in the consumer unit, if they break live and neutral. 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. Generally a "split load" arrangement is used with some circuits protected by the RCD, and others not. 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. Check that all live prods on the devices are fully inserted and located into the live busbar. When the MCBs are clipped onto the DIN bar, the bus bar is inserted into the live terminal at the bottom of the MCB. How to Wire and Install an Electrical Outlet Receptacle? hbbd```b``6 i#dGA${0 a} ">` WDrEuAdv f.bc*":`Rl&XY,, fHm;A `3 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? First of all, disconnect the Fuse between kWH energy meter and the utility pole to cut-off the main power supply. 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 . When screwed tight this gives live feed to all the MCBs.Consumer Unit with MCBs and Bus Bar. 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. (ex. Please also see our project on the New Wiring and Cable Colours. 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. RCD+MCB, 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, How to Wire a Three Phase, 400V Distribution Board? A smaller white lead is a functional earth connection. In the tutorials above, We have used the IEC wiring color codes (applicable to EU, UK and other countries) as follows. In single phase supply, the voltage between phase and neutral is 230V AC. This item is commonly used in both residential and commercial settings including garages, outhouses and stables. This will vary and you should always check with a qualified electrician.Main double pole isolation switch on din bar with live and neutral coming into the main double pole switch from the meter and earth terminal block, Main double pole isolation switch on din bar with live and neutral coming into the main double pole switch from the meter and earth terminal block. UK & IEC Wiring Color Codes Single Phase Supply, Your email address will not be published. This allows the circuit to be divided into two, usually one upstairs, one down. 158 0 obj <>stream Wiring a Garage Consumer Unit with RCD & Connecting 1-, 230V Load Points in it. We work with the industries best to ensure that we recommend only reliable and trustworthy tradesmen. 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]. 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. 163 0 obj <>stream Are you a trade or supplier? Looks Like You're Using an Ad Blocker. In Stock A garage fuse box is simple to install, troubleshoot and repair due to the simplicity and basic design with top hinged door. 0 Now connect the Neutral wire N (Blue color) to the input N terminal of RCD. 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. This page was last edited on 12 January 2023, at 10:04. 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. When an electrician must be called out, this localised fault can be resolved faster (and therefore cheaper) in contrast with the RCD+MCB's arrangement, which only indicates a fault somewhere within that RCD's set of circuits.

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