BS 7671: 18th Edition Wiring Regulations – Study when you want and pass your exam when you're ready…
05: Cable Size and Protective Device Selection The cable most commonly used in domestic electrical installations is the 70 °C thermoplastic PVC insulated and sheathed flat cable which is often referred to as ‘Twin and Earth’ or ‘T&E’ and is available in various sizes ranging from 1.0 mm² up to 16 mm². As well as … Read more
01: Ohm’s Law Ohm’s law is one of the most important theories and a corner stone principle of the electrical industry. We are going to have a look at what Ohm’s law is and how it applies to the electrical world. Firstly, let’s look at the 3 key components that form an electrical circuit. They … Read more
To become an approved domestic electrical installer who can self-certify their own work you will need to be a member of a Competent Person’s Scheme. Published in 2020 and in effect from September 2021 the IET Electrotechnical Assessment Specification sets out the minimum requirements to be met by an electrician and or company in order … Read more
Insulation resistance testing on a new installation(i.e. during initial verification) The object of this test is to verify that the quality of the insulation surrounding the conductors is satisfactory and has not deteriorated or been damaged causing short-circuits and earth faults. It is done at the consumer unit with all the installation switches closed ‘on’. … Read more
Continuity of Ring Final Circuit Conductors The objective of this dead test is to ensure that all ring circuit conductors are continuous throughout the ring, with no breaks and no interconnections and also that all connections are electrically and mechanically sound. This test also verifies the polarity of each socket outlet. The test is made … Read more
Introduction… Initial Verification: Dead testing must be completed after your inspection and always before any live testing takes place. This is to ensure that all safety systems such as the main earthing, main bonding and all circuit protective conductors are in place and that there is no risk of any short circuits or earth faults … Read more
How to connect a 2-way lighting circuit… When a single light needs to be switched on and off from two positions such as on stairs or landings a two-way lighting switch arrangement can be used. The most common and easiest way of doing this is to link both of the light switches together using a … Read more
Introduced in February 2020. Amendment 1 is an amendment to Part 7 of BS7671:2018, Section 722 Electric Vehicle Charging Installations. It does not apply to electric vehicle charging points that employ inductive charging, or to mobility scooters and similar chargers for vehicles of 10 amps or less. “All electric vehicle charging installations that are commenced … Read more
Section 722 BS7671:2018 Amendment 1 2020 : Electric Vehicle Charging Installations A brief overview 722.1 Scope: Section 722 does not apply to electric vehicle charging points that employ inductive charging or to mobility scooter and similar chargers for vehicles of 10 A or less. 722.311: Load curtailment, reduction or disconnection (automatically or manually) may be … Read more
Periodic Inspection and Testing and completion of an Electrical Installation Condition Report ‘EICR’ The aim of a periodic inspection and test is to produce a report on the condition of an electrical installation and to ascertain whether it is safe for continued use. If available, previous inspection and test documents should be sought prior to … Read more