{"id":3913,"date":"2020-12-27T20:46:16","date_gmt":"2020-12-27T20:46:16","guid":{"rendered":"https:\/\/www.chatteris.biz\/blog\/?p=3913"},"modified":"2022-08-31T22:28:49","modified_gmt":"2022-08-31T21:28:49","slug":"garden-cabin-electrics","status":"publish","type":"post","link":"https:\/\/www.chatteris.biz\/blog\/garden-cabin-electrics\/","title":{"rendered":"Garden cabin electrics"},"content":{"rendered":"\n<div class=\"gutentoc tocactive iconick\"><div class=\"gutentoc-toc-wrap\"><div class=\"gutentoc-toc-title-wrap\"><div class=\"gutentoc-toc-title\">Table Of Contents<\/div><div id=\"close\" class=\"text_open\">show<\/div><\/div><div id=\"toclistclose\"><div class=\"gutentoc-toc__list-wrap\"><ul class=\"gutentoc-toc__list\"><li><a href=\"#expected-use-of-the-cabin\">Expected use of the cabin<\/a><\/li><li><a href=\"#maximum-demand\">Maximum Demand<\/a><\/li><li><a href=\"#submain-cable-size-type-and-installation-method\">Submain cable size, type and installation method<\/a><\/li><li><a href=\"#existing-house-supply-characteristics\">Existing house supply characteristics<\/a><\/li><li><a href=\"#installation-method-within-the-cabin\">Installation method within the cabin<\/a><\/li><li><a href=\"#update\">Update<\/a><\/li><\/ul><\/div><\/div><\/div><\/div>\n\n\n\n<p>This is a follow on from my<a href=\"https:\/\/www.chatteris.biz\/blog\/carsare-grande-log-cabin\/\" target=\"_blank\" rel=\"noreferrer noopener\"> Dunster House cabin build<\/a> blog, please note that this work is notifiable under Part P of Building Control Regulations and should only be carried out if competent to do so.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0780-Medium.jpg\" alt=\"\" class=\"wp-image-3908\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0780-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0780-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0780-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>I broke the cabin wiring process into a number of parts, these are:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Expected use of the cabin<\/li><li>Cabin power demand<\/li><li>Submain cable size, type and installation method<\/li><li>Existing house supply characteristics<\/li><li>Installation method within the cabin<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"expected-use-of-the-cabin\">Expected use of the cabin<\/h2>\n\n\n\n<p>The cabin is for recreational purposes and will be used throughout the year, this means provision will be needed for TV, lighting , gym equipment , general power both inside and outside of the cabin, exterior lighting, internet and a way to not only heat the cabin in the winter, but to cool it in the summer, all this builds a picture of power demand.<\/p>\n\n\n\n<p>Heating the cabin will take the most power, so I used an online calculator work out heat loss and the energy required to raise the cabin temperature to 20 <sup>0<\/sup>  when the outside temperature is 0<sup>0<\/sup> , this worked out to be just under 4kW, I then allowed a further 2kW for an external plug-in patio heater should we be sat outside.<\/p>\n\n\n\n<p>It is equally important that the cabin can be cooled for used in the summer, the highest temperature recorded in the cabin so far was over 42.4<sup>0<\/sup> on the 19th July 2022, so the installation of an energy efficient Samsung AR18RXFPEWQX heat pump (5kW Cooling\/6kW Heating capacity) was an obvious choice with a rated power consumption 1745W during heating.<\/p>\n\n\n\n<p>Fixed loads  such as treadmill, fridge and TV within the cabin are calculated to be 750W.<\/p>\n\n\n\n<p>Inside and outside lighting is low energy LED and comprises of a total of 12 x 20W luminaires.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"maximum-demand\">Maximum Demand<\/h2>\n\n\n\n<p>Adding the predicted loads together gives a  demand of just under 5kW or 21.7 Amps, however, this is not the correct method, applying BS7671 18th Edition On-Site Guide Appendix A for diversity of circuit loadings, the maximum demand based on known and unknown loads after the application of  diversity allowance factors and engineering judgement is 36.65Amps (8.43kVA).<\/p>\n\n\n\n<p>The breakdown of this is:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Way<\/td><td>Circuit<\/td><td>Load W<\/td><td>Amps<\/td><td>Diversity Factor %<\/td><td>Demand<\/td><\/tr><tr><td>1<\/td><td>Low Level Sockets<\/td><td><\/td><td>20<\/td><td>40<\/td><td>8<\/td><\/tr><tr><td>2<\/td><td>High Level Sockets<\/td><td>1000<\/td><td>4.35<\/td><td>Assesed<\/td><td>4.35<\/td><\/tr><tr><td>3<\/td><td>External Sockets<\/td><td><\/td><td>20<\/td><td>40<\/td><td>8<\/td><\/tr><tr><td>4<\/td><td>Air Conditioning<\/td><td><\/td><td>11.5<\/td><td>100<\/td><td>11.5<\/td><\/tr><tr><td>5<\/td><td>Internal Lights<\/td><td><\/td><td>6<\/td><td>40<\/td><td>2.4<\/td><\/tr><tr><td>6<\/td><td>External Lights<\/td><td><\/td><td>6<\/td><td>40<\/td><td>2.4<\/td><\/tr><tr><td><\/td><td><\/td><td><\/td><td><\/td><td>Sum<\/td><td>36.65<\/td><\/tr><tr><td><\/td><td><\/td><td><\/td><td><\/td><td>kVA<\/td><td>8.43<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"submain-cable-size-type-and-installation-method\">Submain cable size, type and installation method<\/h2>\n\n\n\n<p>British Standards 7671 18th Edition in conjunction with the IET On Site Guide (OSG) and manufactures data sheets will enable all the cable calculations to be undertaken, however, their are a number of cable calculation tools online, this is an example of my cabin calcs, although I did do them manually before verifying the results with the excellent online toolkit from jarsoftelectrical (Cable-Mate) :<\/p>\n\n\n\n<p>Project Name : Cabin Submain with Diversity Allowance<\/p>\n\n\n\n<p>Cable ID \/ REF number : DB1\/Way 1 to DB2<\/p>\n\n\n\n<p>Supply Voltage = 230 Volts<br>Power factor = 1<br>Ib &#8211; Design current = <strong>36.65 Amps<\/strong><br>Protective Device Type = MCB type B (BS EN 60898)<br>In &#8211; Protective Device Rating = 40 Amps<\/p>\n\n\n\n<p>Cable Type : Thermosetting ARMOURED 90\u00b0C &#8211; Multicore<br>Length of run of cable = <strong>21 metres<\/strong><br>Maximum permissible Voltdrop: <strong>3% (Lighting)<\/strong> = 6.9 volts : Appendix 4<br>Maximum selected Voltdrop for this calculation = 6.9 volts<\/p>\n\n\n\n<p>Installation Method : Sheathed, armoured or multicore cables direct in the ground:<br>with added mechanical protection (e.g cable covers).<br>An installation depth of 0.5 Mtr, A soil thermal resistivity of 2.5 K.m\/W<br>(method D)<\/p>\n\n\n\n<p>Ambient temp = 20 \u00b0C<br>Number of circuits including this one = 1<br>Length of cable in thermal insulation = none<\/p>\n\n\n\n<p>Apply Correction factors:<br>From TABLE 4C2 : Cg = 1 (Grouping)<br>From TABLE 4B2 : Ca = 1 (Ambient temp) &#8211; Ground Temperature : 20 \u00b0C<br>From TABLE 52.2 : Ci = 1 (Insulation)<br>Protective device factor for Buried cables : Cc = 0.9 (Burried direct)<br>For an installation depth of 0.5 Mtr : TABLE 4B4: Cd = 1.03<br>For soil thermal resistivity of 2.5 K.m\/W : TABLE 4B3: Cs = 1<br>Protective device factor : Cf = 1<\/p>\n\n\n\n<p>It = tabulated current carrying capacity<br>It = In \/ (Cg x Ci x Ca x Cf x Cc x Cs x Cd)<br>It = 40 \/ (1 x 1 x 1 x 1 x 0.9 x 1 x 1.03 )<br>It = 43.15 Amps<br>From TABLE 4E4A Cable selected = 6 mm\u00b2<br>Current capacity of cable selected = 53 Amps<\/p>\n\n\n\n<p>TABLE 4E4B For 6 mm\u00b2: mV\/A\/m = 7.9<br>mV\/A\/m corrected for power factor = mV\/A\/m x Power Factor = 7.9 x 1 = 7.9<\/p>\n\n\n\n<p>Voltdrop = (mV\/A\/m x Length x Design current) \/ 1000<br>Voltdrop = ( 7.9 x 21 x 36.65 ) \/ 1000<br>Voltdrop = <strong>6.08 Volts<\/strong><br>(Maximum permissible voltdrop (regulation &#8211; 525) = 6.9 Volts)<\/p>\n\n\n\n<p>Calculated Cable size = <strong>6 mm\u00b2<\/strong>, Minimum Earth conductor size = 6 mm\u00b2 (Table 54.7)<br>Maximum Cable Length = 23.8 Metres<\/p>\n\n\n\n<p>My calculated maximum demand is the worst case, it is highly unlikely that the sustained loading on the cabin will exceed my original value of 21.7Amps based on predicted usage, however, I have designed the installation to meet the current regulations and that includes cable sizing, I could have gone for a 10mm<sup>2<\/sup> SWA cable but that would have been over-engineering in my view as all regulatory requirements are within parameters.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0051-Medium.jpeg\" alt=\"\" class=\"wp-image-3925\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0051-Medium.jpeg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0051-Medium-225x300.jpeg 225w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption>Trench contains 6mm 2 core SWA Submain and 1.5mm 3 core SWA external lighting cables, also 2 x 25mm flexible copex all bedded on sand with warning marker tape.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4121-Medium-rotated.jpg\" alt=\"\" class=\"wp-image-3938\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4121-Medium-rotated.jpg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4121-Medium-225x300.jpg 225w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption>Flexible copex transitions to 25mm conduits, one conduit is spare to the cabin, the other contains 3 x Cat5e network cables and 1 x TV Coaxial Cable.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0074-Medium.jpeg\" alt=\"\" class=\"wp-image-3926\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0074-Medium.jpeg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0074-Medium-225x300.jpeg 225w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption>SWA marshalling cabinet from cabin  for external bollards, deck &amp; garden lighting including water features.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"existing-house-supply-characteristics\">Existing house supply characteristics<\/h2>\n\n\n\n<p>The supply origin is TN-C-S referred to as PME (Protective Multiple Earthing), in this arrangement the incoming cable is of concentric construction:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/cable.jpg\" alt=\"\" class=\"wp-image-3916\" width=\"340\" height=\"191\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/cable.jpg 474w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/cable-300x168.jpg 300w\" sizes=\"auto, (max-width: 340px) 100vw, 340px\" \/><figcaption>Inner Phase conductor, outer conductors Neutral\/Protective conductor<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Only if certain conditions are met can this type of supply, including earthing, be extended to outbuildings, I therefore opted for a TT supply to the cabin which will have its own independent earth electrode with all cabin circuits protected by RCBOs (Residual Current Circuit Breakers with Overcurrent protection).<\/p>\n\n\n\n<p>With a TT arrangement it is important not to &#8216;import&#8217; an earth path from the house, therefore the  submain SWA terminates into a plastic external enclosure, the TV aerial cable has a galvanic isolator installed to break the  shield at the house and the Cat5 internet cables have no connection to earth.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0769-Medium.jpg\" alt=\"\" class=\"wp-image-3897\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0769-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0769-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0769-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Point of entry and exit for all cables, earth electrode connection point is also visible.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0801-Medium-e1609157526986.jpeg\" alt=\"\" class=\"wp-image-3934\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0801-Medium-e1609157526986.jpeg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0801-Medium-e1609157526986-300x225.jpeg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0801-Medium-e1609157526986-768x576.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>TV aerial cable Galvanic Isolator.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0798-Medium.jpeg\" alt=\"\" class=\"wp-image-3932\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0798-Medium.jpeg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0798-Medium-300x225.jpeg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0798-Medium-768x576.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Three  patch panel ports dedicated to the cabin, pink leads denote POE.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"installation-method-within-the-cabin\">Installation method within the cabin<\/h2>\n\n\n\n<p>Wood expands and contracts with humidity by up to 12mm in my case, therefore the wiring method must be able to accommodate this movement, I chose to use  <a href=\"https:\/\/www.tlc-direct.co.uk\/Main_Index\/Trunking_Pvc_Index\/Maxi_42_Univolt\/index.html\" target=\"_blank\" rel=\"noreferrer noopener\">Univolt 100mm x 50mm dado trunking<\/a>  installed all around the base of the cabin and to the consumer unit, from this trunking 20mm heavy duty PVC conduit is taken to lighting and high level sockets, this gives me total flexibility to add to the wiring system if needed.<\/p>\n\n\n\n<p>To allow for expansion, I have used a combination of lubricated slip couplings for 20mm conduit joints and flexible conduit for movement transitions where appropriate.<\/p>\n\n\n\n<p>  The trunking is capable of having a partition piece inserted to make a segregated trunking compartment, this I have used for data and TV cables.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0781-Medium.jpg\" alt=\"\" class=\"wp-image-3909\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0781-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0781-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0781-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Cabin DB2, trunking has lighting switches for gym lights and dartboard, also power energy monitor and separate control for treadmill supply<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0796-Medium.jpeg\" alt=\"\" class=\"wp-image-3931\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0796-Medium.jpeg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0796-Medium-225x300.jpeg 225w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption>The surface mounted back box with blanking plate under the consumer unit houses the Quinetic external lighting receiver.<\/figcaption><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/CLIP.jpg\" alt=\"\" class=\"wp-image-3924\" width=\"391\" height=\"391\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/CLIP.jpg 800w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/CLIP-300x300.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/CLIP-150x150.jpg 150w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/CLIP-768x768.jpg 768w\" sizes=\"auto, (max-width: 391px) 100vw, 391px\" \/><figcaption>D Line metal fire clips from Toolstation have been used  to give additional support  to the20mm conduit to prevent premature collapse in the event of a fire.<\/figcaption><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0778-Medium.jpg\" alt=\"\" class=\"wp-image-3906\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0778-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0778-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0778-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Tado Smart AC controller remotely operates the Air Conditioning and monitors cabin temperature.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0777-Medium.jpg\" alt=\"\" class=\"wp-image-3905\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0777-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0777-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0777-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0775-Medium.jpg\" alt=\"\" class=\"wp-image-3903\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0775-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0775-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0775-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0774-Medium.jpg\" alt=\"\" class=\"wp-image-3902\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0774-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0774-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0774-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Non Maintained emergency light at low level by the exit door should the lighting power fail to the cabin, to the side of the light is the test key and local fusing.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0794-Medium.jpeg\" alt=\"\" class=\"wp-image-3930\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0794-Medium.jpeg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0794-Medium-300x225.jpeg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0794-Medium-768x576.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption><a href=\"https:\/\/isignsgroup.co.uk\/\" target=\"_blank\" rel=\"noreferrer noopener\">isigns <\/a>did a great job of engraving my grid switches, this now removes any confusion as to what the switches do. <\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0773-Medium.jpg\" alt=\"\" class=\"wp-image-3901\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0773-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0773-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0773-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"697\" height=\"709\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4105-Medium.jpg\" alt=\"\" class=\"wp-image-3937\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4105-Medium.jpg 697w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4105-Medium-295x300.jpg 295w\" sizes=\"auto, (max-width: 697px) 100vw, 697px\" \/><figcaption>8 lighting panels were used  and I&#8217;m really pleased with the light output and uniformity of coverage.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0772-Medium.jpg\" alt=\"\" class=\"wp-image-3900\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0772-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0772-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0772-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Sperate conduits for data and power, the TP Link Access Point is POE.<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0770-Medium.jpg\" alt=\"\" class=\"wp-image-3898\" width=\"504\" height=\"378\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0770-Medium.jpg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0770-Medium-300x225.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0770-Medium-768x576.jpg 768w\" sizes=\"auto, (max-width: 504px) 100vw, 504px\" \/><figcaption>Heat Pump, I had this professionally installed (long story!)<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0792-Medium-1024x473.png\" alt=\"\" class=\"wp-image-3929\" width=\"504\" height=\"232\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0792-Medium-1024x473.png 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0792-Medium-300x139.png 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0792-Medium-768x355.png 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0792-Medium.png 1366w\" sizes=\"auto, (max-width: 504px) 100vw, 504px\" \/><figcaption>Tado graph showing the temperature rise after just a short period of the Air Conditioning being set to heat.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4104-Medium-rotated.jpg\" alt=\"\" class=\"wp-image-3936\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4104-Medium-rotated.jpg 768w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_4104-Medium-225x300.jpg 225w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/image0.jpeg\" alt=\"\" class=\"wp-image-3920\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/image0.jpeg 640w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/image0-300x225.jpeg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div>\n\n\n<p>The cabin consumer unit has 6 RCBO protected ways these are for:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Way 1. Low level dado trunking socket outlets (B20)<\/li><li>Way 2. High level sockets via conduit (B20)<\/li><li>Way 3. External IP rated double sockets (B20)<\/li><li>Way 4. Air Conditioning unit (B16)<\/li><li>Way 5. Internal lighting including emergency light (B6)<\/li><li>Way 6. External lighting and water features (B6)<\/li><\/ul>\n\n\n\n<p>The cabin area is 29.25m<sup>2<\/sup> and the OSG Table H2.1 final circuits to sockets outlets are Type A3, Radial using 2.5mm<sup>2<\/sup> singles.<\/p>\n\n\n\n<p>Low level dado trunking has 13 double sockets, the vast majority are not used but as the cost per socket is less than \u00a35 it was worth doing, the high level socket circuit only has 1 double socket and one single socket so I&#8217;ve assed the maximum load to be 1000w as these sockets are dedicated to low wattage chargers and a TV it is highly unlikely this will be exceeded, especially considering the number for dado sockets \ud83d\ude42<\/p>\n\n\n\n<p>I have installed 3 double IP rated external sockets as a separate Type 3 Radial circuit.<\/p>\n\n\n\n<p>Internal lighting cables are all 1.5mm<sup>2<\/sup> singles, external lighting and water feature cables are 1.5mm<sup>2<\/sup> SWA.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"update\">Update<\/h2>\n\n\n\n<p>Having used the cabin for a year, one of the things I didn&#8217;t install at the time was a means of two way switching the cabins outside lights on or off, I thought the external security light sensors on the house would bring the house mounted lights on if someone left the cabin at night, unfortunately this wasn&#8217;t the case, so the first few steps out of the cabin were in pitch darkness, which is less than ideal.<\/p>\n\n\n\n<p> The solution came with <a href=\"https:\/\/www.tlc-direct.co.uk\/Manufacturers\/Quinetic\/index.html?campaign=Manufacturer&amp;source=msn&amp;ad_id=79852124061351&amp;kw=quinetic&amp;network=s&amp;matchtype=p&amp;product_partition_id=kwd-79852220979426%3aloc-188&amp;test=finalurl_v2&amp;msclkid=ba031de8524b1381312742018b80223e\" target=\"_blank\" rel=\"noreferrer noopener\">Quinetic switches from TLC<\/a>, these are quite amazing as the switches need NO POWER, they internally generate enough energy to transmit to a receiver which could be up to 30m away.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"599\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/QUGDMK.jpg\" alt=\"\" class=\"wp-image-3939\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/QUGDMK.jpg 600w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/QUGDMK-300x300.jpg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/QUGDMK-150x150.jpg 150w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption>Grid switch module from Quinetic<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0791-Medium.jpeg\" alt=\"\" class=\"wp-image-3928\" srcset=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0791-Medium.jpeg 1024w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0791-Medium-300x225.jpeg 300w, https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0791-Medium-768x576.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p>The above picture shows a two gang switch plate, originally this was only a single gang switch for the utility light by the back door, changing this to a grid switch allowed me to have the first switch as the utility light and the second switch as a Quinetic module remotely and wirelessly turning on and off the external cabin lights.<\/p>\n\n\n\n<p>In a previous picture of the cabins four gang switch, the external lighting switch is also a Quinetic module, both paired to a single receiver operating the lights, I also have a keyfob paired to the receiver giving me maximum flexibility in operating the lights.<\/p>\n\n\n\n<p>This modification was very easy to do with no mess, unlike the traditional method of hardwiring and cable chases.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is a follow on from my Dunster House cabin build blog, please note that this work is notifiable under Part P of Building Control Regulations and should only be carried out if competent to do so. I broke the cabin wiring process into a number of parts, these are: Expected use of the cabin &hellip; <a href=\"https:\/\/www.chatteris.biz\/blog\/garden-cabin-electrics\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Garden cabin electrics<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[280],"tags":[289,291,282,283,290],"class_list":["post-3913","post","type-post","status-publish","format-standard","hentry","category-ses","tag-cabin","tag-cabin-wiring","tag-carsare-grande","tag-dunster-house","tag-electrics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Garden cabin electrics - My Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.chatteris.biz\/blog\/garden-cabin-electrics\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Garden cabin electrics - My Blog\" \/>\n<meta property=\"og:description\" content=\"This is a follow on from my Dunster House cabin build blog, please note that this work is notifiable under Part P of Building Control Regulations and should only be carried out if competent to do so. I broke the cabin wiring process into a number of parts, these are: Expected use of the cabin &hellip; Continue reading Garden cabin electrics &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.chatteris.biz\/blog\/garden-cabin-electrics\/\" \/>\n<meta property=\"og:site_name\" content=\"My Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/search\/top\/?q=chatterisweather\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/search\/top\/?q=chatterisweather\" \/>\n<meta property=\"article:published_time\" content=\"2020-12-27T20:46:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-08-31T21:28:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.chatteris.biz\/blog\/wp-content\/uploads\/2020\/12\/IMG_0780-Medium.jpg\" \/>\n<meta name=\"author\" content=\"Ian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@chatterisdotbiz\" \/>\n<meta name=\"twitter:site\" content=\"@chatterisdotbiz\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/garden-cabin-electrics\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/garden-cabin-electrics\\\/\"},\"author\":{\"name\":\"Ian\",\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/#\\\/schema\\\/person\\\/8c24a0b1bf9624c7f930fe2f3a5b5f37\"},\"headline\":\"Garden cabin electrics\",\"datePublished\":\"2020-12-27T20:46:16+00:00\",\"dateModified\":\"2022-08-31T21:28:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/garden-cabin-electrics\\\/\"},\"wordCount\":1796,\"commentCount\":7,\"publisher\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/#\\\/schema\\\/person\\\/8c24a0b1bf9624c7f930fe2f3a5b5f37\"},\"image\":{\"@id\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/garden-cabin-electrics\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.chatteris.biz\\\/blog\\\/wp-content\\\/uploads\\\/2020\\\/12\\\/IMG_0780-Medium.jpg\",\"keywords\":[\"Cabin\",\"cabin wiring\",\"Carsare Grande\",\"Dunster House\",\"Electrics\"],\"articleSection\":[\"Electrical &amp; 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