To view this video, TRACING 3 PHASE WIRING, click on the link below https://www.youtube.com/watch?v=CDW_SKOgYSY How do we go about actually tracing a 3 phase circuit when all the conductors are the same colour, are all unmarked and all are unidentified? This is a much more common occurrence that we realise. There have been many occasions…
P115 – CABLE LENGTH CALCULATIONS FROM RESISTANCE
CABLE LENGTH CALCULATIONS FROM RESISTANCE When inspecting an installation, planning extensions to circuits and other remedial work, we may need to know the length of a circuit’s cables. You may know, for instance, that you have the two ends of a ring circuit, but do you know the route taken by the circuit’s twin and…
VIDEO 107 – 18th EDITION EXAM QUESTIONS – SESSION 3 – HELP and TIPS
To view this video, SESSION 3 – 18th EDITION EXAM QUESTIONS, click on the link below https://www.youtube.com/watch?v=AZ6wZRWxK_k Continuing our series of help and tips videos on how to answer the questions in the 18th Edition Wiring Regulations Exam, this video is Session number 3. There are 60 questions in the BS7671 : 18th Edition Exam…
VIDEO 106 – INSULATION RESISTANCE TESTING and FAULT TRACING
To view this video, INSULATION RESISTANCE TESTING, click on the link below https://www.youtube.com/watch?v=g901A_PSXTY Why do we test the insulation resistance of electrical circuits? After all, it’s just plastic, what can go wrong? In this video we look at the reasons for testing electrical circuits, and then look at some established methods to carry out insulation…
VIDEO 105 – 18th EDITION EXAM QUESTIONS – SESSION 2 – HELP and TIPS
To view this video, SESSION 2 – 18th EDITION EXAM QUESTIONS, click on the link below https://www.youtube.com/watch?v=Y14_fNYGjB8 Continuing our series of help and tips videos on how to answer the questions in the 18th Edition Wiring Regulations Exam, this video is Session number 2. There are 60 questions in the BS7671 : 18th Edition Exam…
P114 – WHY INSULATION RESISTANCE TEST ALL THREE CONDUCTORS?
We’ve just been asked the question: When we insulation resistance test, why do we test all three permutations of the conductors – the wires. If we test Line to Earth and Neutral to Earth and they both give a pass result – for example 299MΩ then why do we need to test Line to Neutral….
VIDEO 104 – TRACING SOCKET CIRCUITS – HOW TO TRACE ELECTRICAL CIRCUITS
To view this video, TRACING SOCKET CIRCUITS, click on the link below https://www.youtube.com/watch?v=r1qyBAAwzmg How do we actually go about tracing a socket circuit? Once the wiring is hidden behind walls and under floorboards, how can we determine the exact route of the cables.? Which socket is first, which socket is next in the circuit? This…
VIDEO 103 – 18th EDITION EXAM QUESTIONS – HELP and TIPS – SESSION 1
To view this video, 18th EDITION EXAM QUESTIONS – HELP and TIPS – SESSION 1, click on the link below https://www.youtube.com/watch?v=7ww30sQxG7s Many people have asked if we could provide a series of help and tips videos on how to answer the questions in the 18th Edition Wiring Regulations Exam. There are 60 questions in the…
VIDEO 102 – THREE PHASE PFC – HOW TO CALCULATE PROSPECTIVE FAULT CURRENT
To view this video, THREE PHASE PFC, click on the link below https://www.youtube.com/watch?v=lFw3dNl1EJY How do we calculate three phase fault currents if our test meters will only test single phase values? Why do we multiply the measured values by different numbers and what do the numbers and the actual tests tell us about the circuit?…
VIDEO 101 – FAULT FINDING ON RING CIRCUITS
To view this video, FAULT FINDING ON RING CIRCUITS, click on the link below https://www.youtube.com/watch?v=iVAEDEvNObE To view all our videos, click on the following link https://www.youtube.com/channel/UCYaJQnpO4XAp0yCgqzMkmfA How do we go about fault finding on a socket ring circuit, or any ring circuit for that matter? What needs to be considered and how can we quickly…