RATING FACTOR CALCULATIONS and CONDITION CODES - How to use Ca, Cg, Ci and Cf etc.
We ask ourselves what all these C factors mean in appendix 4 of the Wiring Regulations. There are some pretty scary looking equations there.
Where would we even start.
And there they are again in the in Appendix F of the On-Site Guide.
So which ones should we use, what are they for and how do we work them out?
In this video from LearnElectrics we will work through some examples of rating factors calculations for electrical cables if we are given certain conditions of installation.
This video is No.141 on our KZhead channel where we have videos on a wide range of electrical topics.
To see a full list of all our LearnElectrics videos, click on the link below.
/ @learnelectrics4402
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Always work safely, electricity can be dangerous. If you are unsure, stop and seek advice.
This video is provided for guidance only. Every electrical situation is different, please check and ensure that you are applying this learning information to your own individual circumstances correctly and safely. If in doubt, stop and seek competent advice.
Excellent content. Can't praise you enough. The penny has dropped due to many of your videos. This is like an online college course. A wonderful resource for many.
Glad you like them. Much appreciated.
excellent explanation. but how & in which situation do we use Cg (The rating factor for grouping).Thanks.
And once again.. a clear , direct and well organised presentation. Thank you very much..
Great feedback, appreciated and thanks for watching. Dave.
Great content as ever Dave, thanks for sharing 🙏
Glad you enjoyed it. Thanks for the support. Dave.
Great explanation once again. Thanks for the video.
My pleasure, thanks for watching. Dave.
Thank you very much it's very well explained.
That's good, so glad it helped. Dave.
Thank you for enriching our information and for an explanation similar to that of technical colleges
My pleasure. Thank you for watching. Dave.
I totally agree.. though I think 'Learn Electrics' is itself a 'Technical College' 👍
Thanks Dave, really useful and helpful - going to take my L3 C&G exams in a couple of months time and I find your videos really helpul in my revision.
Best of luck in the exams. If the videos help then great, that's what they were made for. Dave.
Thank you very much for your very helpful videos. Could you please make some fault finding videos as well. Thank you.
There are several fault finding videos, ring circuits, lighting etc. Have a look on our LearnElectrics website. There is a search box on there, takes you direct to the relevant videos. Dave.
Genius very helpful revision 😃
Thanks for the support. Dave.
say there is a large installation with 20 circuits in trunking leaving the DB. That would mean a grouping factor is 0.38… this would make every cable need to be very large, nevermind if other factors were applicable ? Is this right, anyway around this?
Generally, we should ensure that there is at least 50% plus fresh air in the trunking. And, not all the circuits will count, especially if they are drawing less than 30% of their allowable. I should do a video on this. Thanks.
Good video Dave can you explain 433.1.1. (iii) is right 1.45xIb=Iz 1.45x40A = 46A // 1.45xIz(I2)= Amp 1.45x45=65.25A thanks
Have another look at the video. You are NOT changing the current that flows and NOT changing the fuse. You need to upgrade the cable and choose a stronger cable to cope with the conditions affecting the cable. Dave.