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…
Permitted cable routes / zones BS7671:2018 I’ve recently been asked a question by one of our 18th Edition students and think it would be useful to see it here. ” My inquiry is quite simple really, but I am a little confused as to what is acceptable practice for cables that are installed in walls … Read more
The often misunderstood regulation concerning fires and cable supports… Recently I was speaking to a builder who had been refurbishing an old terraced house and he was telling me about the electrician who completed the rewire. The ceilings on the ground floor had been removed but were going to be re-boarded once the electrics and … Read more
There are Two Types of Residual Current Device… Residual current operated circuit breaker without integral overcurrent protection – an RCCB Split load consumer units usually contain two RCCBs each protecting multiple circuits within the consumer unit with overload and short circuit protection provided via the individual circuit breakers. Problems can arise when the RCCB within … Read more
Socket Rings: Three separate ring circuits are often used for sockets around the home, one upstairs, one downstairs and one for the kitchen. Each separate ring is fed from the consumer unit via an individual 32A type B circuit breaker and a separate 30mA RCCB via a split load board or a combined 32A/30mA RCBO … Read more
When a light needs to be switched on or off from two separate positions which is usually the case 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 3-core and CPC PVC … Read more
Isolation and Switching in Domestic Kitchens… Let’s take a look at a few definitions first… Isolation: Function intended to make dead for reasons of safety all or a discrete section of the electrical installation by separating the electrical installation, or a section thereof, from every source of electrical energy. Emergency Switching: An operation intended to … Read more
Within older domestic installations that complied with earlier versions of the Wiring Regulations the main bonding and supplementary bonding should be in place. However, within a new installation due to the introduction of RCDs and new Wiring Regulations it is now possible to omit both main and supplementary bonding in a new installation. Omission of … Read more
Why on a TN-S earthing system is the maximum Ze given as 0.8 ohms by the supply authority when it’s often protected by a BS 88-3 100A fuse which has a maximum Zs of 0.38 ohms? This maximum value for Ze of 0.8 ohms for a TN-S earthing system is a value that is quoted … 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
Wiring a Shower. Perhaps one of the easiest circuits to install is the one that feeds a shower. Although it’s just a simple radial circuit there are a few pit holes you’ll need to avoid. We are going to assume that we are dealing with a domestic installation and as such Volt Drop will not … Read more