In Part 6 Chapter 62 of the 17th Edition BS 7671 we find guidance on completing a periodic inspection and test on an existing electrical installation. Section 621: 621.1contains the where, why and 621.2 to 612.4 is all of the whats and the who is mentioned in 621.5
READ MOREAppendix 3: BS7671 (2015) RCDs From Table 3A Time / Current RCDs ‘disconnection times’ Non-delay: Residual current of 1 x its rating = 300ms max Residual current of 2 x its rating = 150ms max Residual current of 5 x its rating = 40ms max Delay ‘S’: Residual
READ MOREThe 17th Edition City & Guilds 2382-15 exam can be much easier to pass if you know these ‘secrets’… 1: The question number will tell you where to look in the book for the answer. Very useful. For example… Question 3 answer will be in Part 1 Question 15 answer
READ MOREThis may not be an issue in newer bathrooms that comply with current editions of BS7671 as supplementary bonding in bathrooms may be omitted when regulations 701.415.4.5 (iv), (v) and (vi) are met. However, supplementary bonding the radiator has always been a grey area especially in older bathrooms because the radiator may
READ MOREHi, I recently received an email from a student who’d just passed his 17th Edition City & Guilds 2382-15 exam saying… There was only one question that I had absolutely no idea on, it was regarding Circuit breaker Types. I can’t remember the question exactly, but but it
READ MOREThe17th Edition of the Wiring Regulations gives us methods of fault protection within Part 4 Chapter 41 BS 7671. But firstly what is Fault Protection? Part 2 of BS 7671 Says… “Protection against electric shock under single fault conditions” In plain language this means that fault protection provides us with
READ MOREIt’s the festive season ‘again’ and just for a bit of fun here’s… “Ten Wiring Regulations That Apply to Christmas” 314.1 Every installation shall be divided into circuits, as necessary to: (iii) take account of the hazards that may arise from the failure of a single circuit such
READ MORECircuit Breakers Perhaps the most common of all protective devices circuit-breakers are found in modern single-phase domestic consumer units and three-phase industrial / commercial distribution boards. The British Standard BS EN 60898 applies to these devices and they usually come in sizes of 2 A up to 125 A. Apart
READ MORESection 722: Electric Vehicle Charging Installations was originally added to BS7671 as Amendment 2 in 2013 as a loose copy that could be ‘stuck’ into the book. It was incorporated into the full version of the 17th Edition Wiring Regulations with Amendment 3 in 2015. It’s intended to cover
READ MOREI’m regularly asked… “With the City & Guilds 17th Edition qualification am I allowed to carry out work in domestic properties?” My reply… In order to carry out electrical work in domestic installations you will also need to comply with Part P and other relevant parts of the building
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