To view this video, 2391 ASSESSMENT PRACTICE – 1 – ESSENTIAL CALCULATIONS AND CIRCUIT QUESTIONS, click on the link below In this video we look at some typical assessment questions such as you might expect for the 2391 assessments and similar courses. There are a number of electrical qualifications that all follow a similar prospectus…
VIDEO 112 – Find r1 from Zs – EASY ELECTRICAL CALCULATIONS
To view this video, Find r1 from Zs – EASY ELECTRICAL CALCULATIONS, click on the link below https://www.youtube.com/watch?v=9DLgM8wM5xo We should all know how to calculate Zs from the circuit measurements that we make. But can we reverse the process. If we have measured Zs then how can we work backwards and arrive at the resistances…
VIDEO 111 – 2391 – RING CIRCUIT TESTING – RESISTANCE – R1+R2
To view this video, 2391 – RING CIRCUIT TESTING , click on the link below https://www.youtube.com/watch?v=yPmBpunvoT0 We’ve had a few requests to explain what sort of “things” an assessor is looking for when they are observing someone carrying out ring circuit tests. And we’ve also had questions about just what is an R1 plus R2…
VIDEO 110 – INSULATION RESISTANCE TESTING – 3 PHASE CIRCUITS – SEQUENCE OF TESTING
To view this video, INSULATION RESISTANCE TESTING – 3 PHASE CIRCUITS, click on the link below https://www.youtube.com/watch?v=Xe9vD_a3qEE We have had a number of requests for a method or sequence of testing for 3 phase installations. In this short video we will show just one method of a reliable and fool-proof testing sequence that we have…
VID 109 – CABLE LENGTH FROM RESISTANCE – EASY CALCULATIONS – HELPFUL PRINTABLE TABLE
To view this video, VID 109 Notify post – CABLE LENGTH FROM RESISTANCE – click on the link below https://www.youtube.com/watch?v=CjewkvxxHQE Just how long is that cable? How often have we thought that. Have you ever wondered just how far that ring circuit might actually travel. Is it just a short circuit around the kitchen or…
P117 – 2391 CIRCUIT QUESTIONS No.2 – CALCULATIONS AND CIRCUIT CHART – PRINTABLE PDF
P117 – 2391 CIRCUIT QUESTIONS No.2 – CALCULATIONS AND CIRCUIT CHART – PRINTABLE PDF This continues our mini-series on 2391 assessment questions with another test results chart and a further 8 questions with fully worked answers. We have also included an essential calculations sheet with the most relevant calculations for this video and exercise. The…
P116 – Find r1 from Zs – Printable PDF – Easy Electrical Calculations
We should all know how to calculate Zs from the various circuit measurements. But can we reverse the process. If we have measured Zs then how can we work backwards and arrive at the resistances of the individual circuit conductors? And how do we unravel the resistance values of a ring…
VIDEO 108 – TRACING 3 PHASE WIRING and IDENTIFYING CABLES
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…