the Regs Guy

A professional qualified electrician with nearly forty years of under paid, hard work within the electrical installation industry. I've also been a successful electrical installation tutor since 2008. Delivering both City & Guilds / EAL level 3 courses including "18th Edition Wiring Regulations, Inspection & Testing (initial verification and periodic inspection, testing and reporting), Building Regulations, PAT and Part P etc." both in the private sector and local FE colleges. I've also been running my own training center since 2015. See www.waybrite.co.uk

Domestic Electrical Installation Certification

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BS7671 requires an Electrical Installation Certificate (EIC) accompanied with a Schedule of Inspection and a Schedule of Test Results is issued with all new electrical installation work. The Electrical Installation Certificate (EIC) gives the client the re-assurance that the installation complies with the latest requirements of the standards for electrical installations ‘BS7671:2008+A3:2015’ here within the … Read more

Protective Conductors and Bonding Conductor Sizes

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Protective Conductor Sizes… Regulation 543.1.1: This can be achieved by either calculation (543.1.3) or selected (543.1.4) from Table 54.7. The formula used in 543.1.4 for calculating the size of a protective conductor is covered in great detail in a session inside our 17th Edition online course. Selecting from Table 54.7 The protective conductor size is … Read more

Automatic Disconnection of Supply

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Automatic disconnection of supply (ADS) is the most widely used method for achieving protection against electric shock in an installation. It works by limiting the size and duration of any voltages between exposed-conductive parts / extraneous-conductive parts or Earth. This is achieved through a combination of factors that must be in place. Basic Protection: Provided … Read more

Cable Calculations Part 2

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Voltage Drop Think of voltage drop as similar to a loss in pressure along a water pipe over a long distance. So just like with water in a pipe a conductor will lose ‘x’ amount of pressure measured in millivolts ‘mV’ for every Amp ‘design current’ that flows along it for each meter. This is … Read more

Cable Calculations Part 1

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The purpose of performing a cable calculation is to ensure that a cable is not overloaded. This can produce an excessive amount of heat which in turn can damage the cable and the installation and may even cause a fire. So, here’s how that’s done… Firstly how much current is your appliance going to use? … Read more

Non Wiring Regulations Questions!

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This is more of an electrical general knowledge question rather than a Wiring Regulations one but they do pop up in the City & Guilds exam every so often. “A twin and CPC, PVC cable has a 2.5 mm line conductor with a resistance of 0.46 ohms and 2.5 mm neutral conductor with a resistance … Read more

Insulation Resistance Testing

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Remember this test can damage equipment and there is also a risk of electric shock from the d.c. voltage produced by your test instrument (usually 500v). We are testing to ensure that the insulation surrounding the conductors is adequate and that there are no short circuits between conductors. It can be done on a complete … Read more

Sockets, Ring and Radial Circuit Arrangements

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Appendix 15 in BS7671 is probably the most useful practical description in the whole book. If you want to know what you can do and what goes where it’s all here. Ring Socket Circuits… Spread your sockets around evenly to avoid overloading any part of the ring. Don’t put immersion heaters, storage heaters on the … Read more