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. 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. 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. Each fuse, or MCB, is clipped onto a DIN bar and the "teeth" of the bus bar are inserted into the MCBs. Are you a trade or supplier? As with all models in the range, there is ample cable space available even when RCBOs are fitted. +M/g(_Gey>gsNja &txO{~`rp.^^sKPE$q&Sf14>d%72Z&Jv^Fb7KCE| -jyjkg5)\s_en?NnansZ&x{%E
tOlS)],b3asA/ ^5+/*'p^G6?( Y!u)-RGJ@sLsh &P?Qh'rq. 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. Consumer Units Designed for safety, installation and aesthetics. How to Determine the Number of Circuit Breakers in a Panel Board? 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 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. How to Wire 120V & 240V Main Panel? 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. You can follow me day by day on Facebook, Instagram, Twitter and TikTok lookout for \"GSH Electrical. In addition, RCD protection is a must in the consumer unit according to the IEC and IET: 17th edition BS-7671. It is because split load consumer units provide protection against overload, overcurrent & short-circuit and earth leakage. . Environmental and energysaving LED lighting, Interior and exteriorportable power solutions, Audio visual andhome entertainment products, UK Customer Services: +44 (0)1952 238 100. A look at RCBOs and how they are fitted into a typical consumer unit. This allows the circuit to be divided into two, usually one upstairs, one down. . This unit has one main switch, two RCDs and each circuit has its own MCB. The whole process is shown in the fig below. Postage: 23.73Expedited Deliveryto United States via eBay's Global Shipping Programme. no need to connect the Neutral wire from the main neutral terminal in the consumer unit. When it comes to what is now equivalent to imperial in terms of the new standard, this is now as follows: The image below shows the mains double pole isolating switch and an MCB clipped into place on the DIN bar.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'diydoctor_org_uk-leader-3','ezslot_15',811,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-leader-3-0');Consumer Unit with MCB and main double pole isolation switchif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'diydoctor_org_uk-large-leaderboard-2','ezslot_11',685,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-large-leaderboard-2-0'); Consumer Unit with MCB and main double pole isolation switch, The image below shows two MCBs and the bus bar. In short, there should be two phase wires from the same line terminal of MCB. Black for Neutral, Red for Phase or Hot and Green for earthing. Here is a detailed explanation of the consumer unit and how it should be installed in the UK. Consumer Units . Solid busbar pin and stranded wire in the same terminal, not designed for that. 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. The following fig shows how to wire and install single phase 230V load circuits in split load CU. ), and how much protection is required for each circuit. 4g0OO*u7FuP"YG*:v(A
jSnsE)o'TyNX4ob#Fyw+[? You have done, the electrical appliances now can be connected to the new wired consumer unit and its MCBs via three wires i.e. The rail and the shape of the front opening are standardized but the busbar arrangements are not. 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]. %%EOF
Please see our project on Part P of the building regulations for information on DIY Electrical Installation. 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. Never stand or touch wet and metal parts while repairing or installation. Instructions on wiring a consumer unit to UK specifications for dual RCD and RCBO consumer units. Includes international tracking. 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.
An RCBO consumer unit has one main switch but each circuit is protected by an RCBO which is a combination of an MCB and an RCD. Phase from single pole MCB, Neutral from Neutral busbar and Earth wire from the. How to Wire and Install an Electrical Outlet Receptacle? 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. Left one may be correct, but it's too short, the red loop of wire is not acceptable. Keep in mind that we have usedIEC wiring color codesfor illustration purposes only. or if you are doing it yourself you can find suppliers local to you.
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 . RCBOs are a single device which combines a circuit breaker and RCD. The use of RCDs is necessary, on two occasions, to meet the wiring regulations. marketing, promotion, packaging, advertorials, and consumer or merchandising products. There are two additional Neutral busbars in the consumer unit viz for RCBOs and RCDs (for simplification and illustration). Now, connect the output Neutral wire from the main switch (as blue color) to the common Neutral Busbar terminal in the consumer unit. 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 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. Please Whitelist Our Website by Allowing Ads. So please! 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. For load circuits wiring, there are two terminals on the output side of an RCBO viz Phase and Neutral. K5593S. marketing, promotion, packaging, advertorials, and consumer or merchandising products. Advice on installing a consumer unit. 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. Generally, there is a 40A, 2-Poles, Two Poles RCD (Residual Current Device). Staircase Wiring Circuit Diagram How to Control a Lamp from 2 Places? A consumer unit can use an RCD as the main switch. In the image below, we show the earth cable from the meter (L). Phase, Neutral and Protective Earth. Moreover, you may use RCBOs with RCD instead of single pole MCB if needed. For a better experience, please enable JavaScript in your browser before proceeding. Breaker Box Installation. RCD+RCBO, How to Wire 230V Dual Split Load Consumer Unit? You may now restore back the power supply by turning ON the main switch or related. The older fuse wires are being replaced gradually by their modern equivalent, the MCB or miniature circuit breaker. %%EOF
Keep in mind that RCD should be properly installed i.e. 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. A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). 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. 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. 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. 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. Please check your inbox to confirm your subscription. If a fault develops on one circuit, all circuits would be switched off immediately. Before fitting the front cover, check the tightness of all screw type connections, including factory made connections. 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. Pre-pay for multiple images and download on demand. Be careful because its all about electricity and electricity is too dangerous. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? 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. Generally a "split load" arrangement is used with some circuits protected by the RCD, and others not. Select the supplier or trade you require, enter your location to begin your search. Located in: bromley, Kent, United Kingdom. Let us help you find a tradesman local to you. How to Determine the Right Size Capacity of a Subpanel? I have installed a new mcb in my consumer unit. 0
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FACEBOOK https://www.facebook.com/gshelectrical/ INSTAGRAM https://instagram.com/p/BrIhZmrAYGDTmjMdb9lUNQodMevqsbDDki3qpQ0/ TWITTER https://mobile.twitter.com/gsh_electrical TikTok https://vm.tiktok.com/ZMRBLFdhe/#GSHElectrical #Electricaltrainingvideos Step by Step Procedure with Calculation & Diagrams, How to Size a Single Phase and Three Phase Transformer in kVA? 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 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. 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. As they must sense the current in both the line and neutral, they have connections for both. How to Wire 277V & 480V, 1-Phase & 3-Phase, Commercial Main Service Panel? The protection devices in a split load CU do the following jobs. Search stock photos by tags. This example has a flying lead for the incoming neutral connection and a standard terminal for the line busbar. This then becomes a split load consumer unit and is shown above. A dual RCD consumer unit can be fitted. 6181Y Easi-Fit Meter Tails Kit 25mm 3m. Nulla vel ex eget lacus imperdiet mattis convallis quis leo. . See details. 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. Similarly, the 32A breaker can be used for electric ranges, electric showers and other high power devices. Additionally, connect the single pole MCB to RCD through a common busbar segment as shown in fig. How to Size a Load Center, Panelboards and Distribution Board? Please Whitelist Our Website by Allowing Ads, How to Wire 1-Phase Split Load Consumer Unit? Even More Electrical Wiring Installation & Tutorials, A Complete Guide About Solar Panel Installation. The first one for RCBOs common busbar and the second one for RCD and common busbar for associatedMCBs. Delivery: Estimated between Fri, 17 Mar and Wed, 22 Mar to 23917. 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. These boxes can also be fitted with cartridge fuses or miniature circuit breakers (MCBs). Consumer units have different methods of protecting circuits. Your email address will not be published. Be careful because its all about electricity and electricity is too dangerous. To connect the rated MCBs and RCD in the garage consumer unit for specific appliances, follow the following simple steps. For example, the LED lamp and ceiling fan is controlled and protected by RCD + MCBs. Im more worried about the one on the right. Copyright 2008-2023 Flameport Enterprises Ltd - - Terms & Conditions - Contact details - Author: John Ward. For use with all Hager Design 10, 30 and 50 consumer units, the VAB16 16 module busbar may be cut to suit any board. (ex. Brown as Live L, Blue as Neutral N and Protective Earth E as Green with Yellow Stripe. illinois obituaries 2020 . 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. This saves you the expense of replacing the entire board when you need to reconfigure electrical circuits. We Rely on Advertising to Help Fund Our Site and Provide Free Information. Vivamus consectetur mattis dapibus. Phase from single pole MCB, Neutral from Neutral busbar and Earth wire from the Earthing/Grounding busbar. Home > DIY How To Projects and Tutorial Guides > Installing a Consumer Unit Consumer Units Explained. Split load consumer unit is the combination of RCBO Residual Current Breaker with Over-Current, RCD Residual Current Device and MCB Miniature Circuit Breaker. So please! This may helpful for the readership outside the UK and EU who still follow the old UK wiring color codes i.e. How to Wire 120V & 240V Main Panel? 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. 137 0 obj
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Phase, Neutral and Protective Earth. The output N terminal of RCD should be connected to the Neutral busbar terminal in the consumer unit. This type of consumer unit was very popular in Britain until 2001 when wiring regulations mandated residual current device (RCD) protection for sockets that could "reasonably be expected to" supply outdoor equipment (BS 7671:2001, .mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}ISBN0-86341-373-0). Wylex have no miss busbar connections and quick release technology built into their circuit breakers, RCBO's and AFDDs. In addition, connect the RCD to the output phase wire of the main switch through jumper wire(as brown color). Vestibulum in blandit enim. Because of this it actually contravenes the most recent (16th Edition) wiring regulations.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'diydoctor_org_uk-large-mobile-banner-1','ezslot_12',688,'0','0'])};__ez_fad_position('div-gpt-ad-diydoctor_org_uk-large-mobile-banner-1-0'); This is easily prevented by using an RCD in conjunction with a main, double pole isolating switch so that it protects only some of the more vulnerable circuits. Shown in the consumer unit casing above, it is a metal, pressed bar, to which the MCBs clip. There were a number of similar designs from other manufacturers but the Wylex ones are by far the most commonly encountered and the only ones for which fuseholders/breakers are still commonly available. We work with the industries best to ensure that we recommend only reliable and trustworthy tradesmen. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/203078425782. In addition, the earth wire should be connected from the main earth terminal. 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. %PDF-1.4
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K5511S. Doing your own electrical work is dangerous as well as illegal in some cases. care should be taken to ensure that the breaker chosen is a good fit for the busbars. For load circuits wiring, there are two terminals on the output side of an RCBO viz Phase and Neutral. Don't want to do this job yourself? Hager VML110 10 Way RCBO Consumer Unit. 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. It is also an offence to interfere with the seals on the electricity meter. In Stock
A dual RCD consumer unit can be fitted. ho8lU *Gt*~E@T7ch6{MF.#]NV*dP\WB-d`*&J#C}x8@A[,R}
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W^ABk 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. An information label near the consumer unit explains this. RCBO & Arc fault protection is recommended in the 18th Edition 2018. Ensure that all devices are engaged correctly on the DIN rail. If you need to find a tradesperson to get your job done, please try our local search below, 63A, 3 No of Single Poles MCBs: 6A, 16A & 32A. 158 0 obj
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You must log in or register to reply here. They simply push on via a spring loaded lock at their back. The terminal and busbar provide maximum flexibility and come as high integrity as standard for a combination of protected and unprotected circuits. 0
A garage fuse box is simple to install, troubleshoot and repair due to the simplicity and basic design with top hinged door. Less common than the other types, an RCD incomer does not use a main switch. Reproduction prohibited unless prior permission is granted by Luceco plc in writing. (14 Available), 10.80
This item is commonly used in both residential and commercial settings including garages, outhouses and stables. The output Live terminal of RCD should be bonded to other MCBs via a common copper busbar segment terminal. RCD Incomer Consumer Unit. 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). No worries, you may use a single Neutral busbar for this purpose. The modern consumer unit is the centre, or heart, of the wiring system in the home. Get Free Android App | Download Electrical Technology App Now! This page was last edited on 12 January 2023, at 10:04. to the terminations when the front cover is fitted to a 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. 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. The photographs are of a split load fuse board. How to fit a miniature circuit breaker (MCB) or RCBO to a busbar in a consumer unit (fuse box). 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. Don't fancy doing this project yourself? endstream
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A garage consumer unit is used to feed up fewer load circuits (generally 2-5 units). In this tutorial, we will be showing how to install a single phase garage consumer unit for 230V with RCDs according to IEC. Posted on June 29, 2022 in gabriela rose reagan. K5590S. How to Wire 120V Water Heater Thermostat Non-Simultaneous? All the. In, The following fig shows how to wire and install single phase 230V load circuits in split load CU. 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. < Consumer Unit Accessories Busbars A busbar is installed within a power distribution board and is designed to connect circuit devices to isolation devices. 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. 102 0 obj
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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.