To view this video, MCB – CIRCUIT BREAKER – HOW DOES IT WORK, click on the link below https://www.youtube.com/watch?v=pBdMa9o6XJk In this video we will look at the popular Miniature Circuit Breakers and find out how they work. Using very simple drawings we will discover the two modes of operation and look at how to interpret…
VIDEO 115 – 18th EDITION EXAM QUESTIONS – HELP & TIPS – 4 – CALCULATIONS
To view this video, 18th EDITION EXAM QUESTIONS – HELP & TIPS – 4 – CALCULATIONS, click on the link below https://www.youtube.com/watch?v=v5S658sj1is 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 4. There will always be questions that…
VIDEO 114 – RCD – RCCB and RCBO Differences Explained
To view this video, RCD – RCCB and RCBO Differences Explained, click on the link below https://www.youtube.com/watch?v=Z1gwO-FsuNY In this video we look at a common misunderstanding and also discuss the main differences between these protective devices. Explained in simple terms with plenty of diagrams and pictures this video will be found useful and informative by…
VIDEO 113 – 2391 ASSESSMENT PRACTICE – 1 – ESSENTIAL CALCULATIONS AND CIRCUIT QUESTIONS
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…