BS 7671: 18th Edition Wiring Regulations – Study when you want and pass your exam when you're ready…
An End to Protective Equipotential Bonding? There are some significant changes being introduced by the 18th Edition of the Wiring Regulations BS 7671:2018. Chapter 41 has arguably one of the most controversial… “Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding … Read more
A new version of the Wiring Regulations will come into effect on the 1st January 2019… The 18th Edition of BS7671:2018 Requirements for Electrical Installations (to give it its full title) introduces some significant changes to the previous 17th Edition of BS7671. This new book if all goes according to plan with the IET will … Read more
How an electric shock occurs… An electric shock occurs when a person becomes part of a circuit, with current entering the body at one point and leaving it at another. The two methods of receiving an electric shock are… Coming into contact with a normally live part (i.e. touching the live terminals within a consumer … Read more
#1: Knowledge of Electricity… A good understanding of the basic principles of electricity is essential, from Ohm’s Law and resistors in series and parallel to power calculations and transformer theory. Including a good working knowledge of cable and protective conductor sizes as well as selecting protective devices their rating and types including the use of … Read more
Sizes of main Bonding Conductors… This can be confusing as the size of the main bonding conductor differs depending on the type of supply. In a TN-S or TT system the main bonding conductor is in relation to the size of the main earthing conductor which is dependant on the size of the incoming line … Read more
Consumer units in new and modern domestic installations should contain Residual Current Devices ‘RCDs’ as well as circuit breakers. Either as combined RCD/circuit breaker devices ‘RCBOs’ which can get a bit expensive or alternatively and less expensive through the use of split load boards with usually two RCCBs protecting multiple circuit breakers. Since January 2016 … Read more
The most common cable found within a domestic electrical installation is the PVC insulated and sheathed Twin and CPC cable – also known as Twin and Earth. A PVC three core and CPC is also used on two-way lighting circuits, smoke detector interlinks, fans with timers and also central heating thermostat connections etc. Cables should … Read more
What makes an electrician? The Electricity at Work Regulations 1989 (EAWR) – Regulation 16 states that… “No person shall be engaged in any work activity where technical knowledge or experience is necessary to prevent danger or where appropriate injury, unless he/she possesses such knowledge or experience, or is under such a degree of supervision … Read more
How an electric shock occurs… Current travels through conductors within a closed circuit. The conductors could be made of copper such as in a cable, other metals, water or in the worst case the conductor can become the human body. An electric shock occurs when a person becomes part of a circuit, with current entering … Read more
The 17th Edition has still got legs… Although the 17th Edition of BS 7671 is due to be replaced by the 18th Edition in January 2019, the 17th Edition is relevant today and will still be as relevant long after that date. The main reason for this is… Any installation designed before January 2019 would … Read more