It’s the festive season ‘again’ and just for a bit of fun here’s… “Ten Wiring Regulations That Apply to Christmas” 314.1 Every installation shall be divided into circuits, as necessary to: (iii) take account of the hazards that may arise from the failure of a single circuit such
READ MORECircuit Breakers Perhaps the most common of all protective devices circuit-breakers are found in modern single-phase domestic consumer units and three-phase industrial / commercial distribution boards. The British Standard BS EN 60898 applies to these devices and they usually come in sizes of 2 A up to 125 A. Apart
READ MOREI’m regularly asked… “With the City & Guilds 17th Edition qualification am I allowed to carry out work in domestic properties?” My reply… In order to carry out electrical work in domestic installations you will also need to comply with Part P and other relevant parts of the building
READ MOREI know I probably need to get out more, but here’s ten reasons I like the 17th Edition of the Wiring Regulations ‘BS7671:2008+A3:2015’. Although it’s a non statutory document BS7671 provides guidance on ensuring the safety of all electrical installations here in the UK, assisting you to comply
READ MORELooped Lighting Circuits – Electrical Installation 101. The most common method is the ‘loop in’ system. This is where cables loop in and out of each lighting point, which is usually a ceiling rose. The wiring may be a Twin and Earth PVC/PVC cable consisting of a Line,
READ MOREAutomatic disconnection of supply (ADS) is the most widely used method for achieving protection against electric shock in an installation. It works by limiting the size and duration of any voltages between exposed-conductive parts / extraneous-conductive parts or Earth. This is achieved through a combination of factors that
READ MOREVoltage Drop Think of voltage drop as similar to a loss in pressure along a water pipe over a long distance. So just like with water in a pipe a conductor will lose ‘x’ amount of pressure measured in millivolts ‘mV’ for every Amp ‘design current’ that flows
READ MOREThe purpose of performing a cable calculation is to ensure that a cable is not overloaded. This can produce an excessive amount of heat which in turn can damage the cable and the installation and may even cause a fire. So, here’s how that’s done… Firstly how much
READ MOREJust a short one this week… Special Locations are locations or installations where there is an increased risk of receiving an electric shock. For this reason and according to BS7671 Part 7 Section 701 any location containing a bath or shower is deemed a ‘special location’. So that’s
READ MOREThis is more of an electrical general knowledge question rather than a Wiring Regulations one but they do pop up in the City & Guilds exam every so often. “A twin and CPC, PVC cable has a 2.5 mm line conductor with a resistance of 0.46 ohms and
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