Within domestic installations there are numerous regulations within BS 7671:2018 concerning additional protection through the use of 30mA RCDs… 411.3.3: Gives us additional protection via a 30 mA RCD for ‘general’ sockets, both indoor and outdoors. 411.3.4: Again 30 mA RCD additional protection for all lighting circuits. 522.6.202:
READ MOREWithin the 18th Edition as far as SPDs and protection against transient overvoltages are concerned there is no need to provide protection for single dwelling units (safe to assume they mean domestic, although there is no definition for a dwelling unit within Part 2 which I think is
READ MOREWhy you shouldn’t spend too much time on the Appendices… At the back of the 18th Edition book ‘BS7671:2018’ we have 17 appendices containing additional or supplementary information to the rules and regulations within the book. If you look though you’ll see that Appendices 11 and 12 are
READ MORECalculating voltage drop… You won’t find this formula anywhere in BS7671:2018 as this is another example of where G&G / EAL assume some prior electrical theory knowledge, but the formula is… Voltage Drop = (mV/A/m) x Ib x L / 1000. (mV/A/m): To find the value for (mV/A/m)
READ MOREThe 18th Edition exam is an assessment of your ability to use the Wiring Regulations BS7671 2018 out there in the big world. As such problems and questions may not always be worded exactly as you come across them in the book. The first step to answering a
READ MOREAn 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
READ MOREA 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
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