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 require you to calculate an answer. Indeed, it is an essential part of our trade, of being an electrician, that we can make calculations of circuit parameters correctly and not have to rely on guesswork or which way the wind is blowing.
In this video, we will concentrate on the two main calculations from the Wiring Regulations book. These are the Adiabatic Equation and the Voltage Drop formulas.
The Adiabatic Equation will allow us to correctly select a suitable size protective conductor, or earth, that will handle any fault currents safely. Why should we worry about the correct size? Copper conductor is expensive, if we install too big a size then yes, it may do the job adequately, but you or your customer have just paid extra money for copper that is not needed. And of course, too small a size can have disastrous consequences. By rearranging the Adiabatic Equation, we can also determine how long it takes for a cable to reach the critical limiting temperature. Will the fuse or breaker trip before the cable is damaged by thermal effects.
The Voltage Drop formula will tell us the voltage drop in a certain length of cable and we can also work this backwards and determine the maximum length of cable to not exceed the voltage drop limits. A very important consideration when planning a new circuit or installation.
The video series is intended as an enhancement to classroom learning where you should be taught to understand the Regulations and their importance to the safe and correct functioning of electrical installations. Viewed alongside formal training classes these videos will certainly enhance your skills and improve your chances of success in the exam.
You can also view our video – ADIABATIC EQUATIONS, by clicking on the link below
https://www.youtube.com/watch?v=173C7yE-xbU
And to view our video – VOLTAGE DROP CALCULATIONS, click on the link below
https://www.youtube.com/watch?v=Z-kw680SIoo
We also have a 14 video series of 18th Edition training videos (Playlist A) which can be accessed through the following link … https://www.youtube.com/playlist?list=PLTVT88nFGKMy1sq4GLVX2SypMp4c9b-mf
This video is No.115 on our YouTube channel where we have videos on a wide range of electrical topics.
To view all our videos, click on the following link
https://www.youtube.com/channel/UCYaJQnpO4XAp0yCgqzMkmfA
To view this video, 18th EDITION EXAM QUESTIONS – HELP & TIPS – 4 – CALCULATIONS, click on the link below
https://www.youtube.com/watch?v=v5S658sj1is
