I’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 MOREA.C. current flowing in a conductor creates an alternating magnetic field. This is made stronger if the conductor is surrounded by a ferrous ‘containing iron’ enclosure such as with steel wire armour ‘SWA’ or steel conduit and also if a single conductor enters a ferrous enclosure on its
READ MOREOver in Part 5 BS7671 we have Chapter 53 – Protection, isolation, switching, control and monitoring. A good way to remember this very important Chapter during your 17th Edition exam is to just think “turning stuff off”. 531: Fault protection (ADS). It tells you what devices you should
READ MOREBS7671 requires an Electrical Installation Certificate (EIC) accompanied with a Schedule of Inspection and a Schedule of Test Results is issued with all new electrical installation work. The Electrical Installation Certificate (EIC) gives the client the re-assurance that the installation complies with the latest requirements of the standards
READ MOREProtective Conductor Sizes… Regulation 543.1.1: This can be achieved by either calculation (543.1.3) or selected (543.1.4) from Table 54.7. The formula used in 543.1.4 for calculating the size of a protective conductor is covered in great detail in a session inside our 17th Edition online course. Selecting from
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
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