the-Regs : BS7671 18th Edition Online Training
BS 7671: 18th Edition Wiring Regulations – Study when you want and pass your exam when you're ready…
the Regs Guy I 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 with the Electricity at Work Regulations. The … Read more
Looped 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, Neutral and CPC (in), a Line, Neutral … Read more
A.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 own. This electromagnetic effect produces heat which … Read more
Over 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 be using for turning things off during … Read more
BS7671 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 for electrical installations ‘BS7671:2008+A3:2015’ here within the … Read more
Protective 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 Table 54.7 The protective conductor size is … Read more
Automatic 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 must be in place. Basic Protection: Provided … Read more
Voltage 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 along it for each meter. This is … Read more
The 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 current is your appliance going to use? … Read more
Just 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 the whole of the bathroom! 701.32.2 to … Read more