Excellent video ! when determining the cpc size it is better to work backwords using the maximum permitted Zs, by applying the formula: maximum R1+R2 =((Zs max − Ze) / (I3 factor x Length)) x1000 in mΩ/metre, and then use table I1 to select a cpc size. This avoids hit and miss calculations.
Thank you so much 🙏 Yes that usually finds a suitable cpc faster. Still needs to be checked with adiabatic. It is possibly to work backwards from adiabatic as well........
Wasn't too distracting was it? The music? Nice to fill the sound spectrum I feel for the boring bits. I never got round to tabbing my 18th.....i did such a great job of my 16th that I was very disheartened at the thought of doing it all again so never did......It would make sense to duplicate the Ci factors within app 4 but I understand the reasons for it being where it is. But as you can see those factors are very generic and this is a good case for learning more about it so you could be confident about saying 10mm is fine..... Which it prob would be tbh but you would need more info on which type of insulation, thermal conductivity etc. I think I put a reference to the standard you would need to go deeper but as usual quite expensive really which is really annoying and baffling when we are all trying to encourage learning! Bsi needs to be a public body which is OK to release its content. Like hse imo.
@@cestemshow music was fine not a distraction , yeah i do a fair amount of flats where you have 101 102 ref methods along with grouping as much as you tell other trades to not cover cables 523.9 i habe to design for it my cookers are spec 10kw the clients spark manager doesnt take 311.1 into account so no diversity so the cookers are 16mm² and showers also 16mm²
Liking these design videos, throughly explained and very informative, thinking of doing the 2396 this year or next but need to revise design stuff before I go for it 👍
Another outstanding video Craig, just a query @ 33.58 I think you work the new zs out wrong!!!! Our ze should have been 0.10ohms (not 0.12ohms) it’s not a biggy though!!! Yes as you mentioned ring final calcs would be good, maybe a calc for running a new sub main to a new shed supply (or something bigger) Great videos keep them coming👍👍
Ha yeah you are prob right. Still complies though right 😬🤞.....prob still had the other example in my head. In the real world I use a spreadsheet that calculates in one direction and then another to ensure it returns to the start point. This takes into account my dyslexia and stops me installing a dodgy circuit but does make teaching hard..... I sometimes say it's deliberate to check if my students are paying attention but alas..... Tis not 🤫🤐
Oh yes, and if you want to earn money doing that circuit i suggest you do :-) I worry about people misunderstanding so went for the safe version......Perhaps i could do a part two where i get the cable size to a economical size?
@@cestemshow 😆Stick a link to it please, I am on a mission to learn as much about design as I can. Gearing up for Level 4 sometime but struggling for information and courses that are UK based. I'll have a good look through your videos and see what else you have on the subject
Love it mate, that CPC sizing part had me vexxed though. damn!
Excellent video ! when determining the cpc size it is better to work backwords using the maximum permitted Zs, by applying the formula: maximum R1+R2 =((Zs max − Ze) / (I3 factor x Length)) x1000 in mΩ/metre, and then use table I1 to select a cpc size. This avoids hit and miss calculations.
Thank you so much 🙏
Yes that usually finds a suitable cpc faster. Still needs to be checked with adiabatic.
It is possibly to work backwards from adiabatic as well........
Great vid like the music , i tend to find regs quickly using the tabs i think i got mine from online helps massively
Wasn't too distracting was it? The music? Nice to fill the sound spectrum I feel for the boring bits. I never got round to tabbing my 18th.....i did such a great job of my 16th that I was very disheartened at the thought of doing it all again so never did......It would make sense to duplicate the Ci factors within app 4 but I understand the reasons for it being where it is.
But as you can see those factors are very generic and this is a good case for learning more about it so you could be confident about saying 10mm is fine..... Which it prob would be tbh but you would need more info on which type of insulation, thermal conductivity etc. I think I put a reference to the standard you would need to go deeper but as usual quite expensive really which is really annoying and baffling when we are all trying to encourage learning! Bsi needs to be a public body which is OK to release its content. Like hse imo.
@@cestemshow music was fine not a distraction , yeah i do a fair amount of flats where you have 101 102 ref methods along with grouping as much as you tell other trades to not cover cables 523.9 i habe to design for it my cookers are spec 10kw the clients spark manager doesnt take 311.1 into account so no diversity so the cookers are 16mm² and showers also 16mm²
Liking these design videos, throughly explained and very informative, thinking of doing the 2396 this year or next but need to revise design stuff before I go for it 👍
Go for it! Will be happy to help any way I can.
Thank you.
Another outstanding video Craig, just a query @ 33.58 I think you work the new zs out wrong!!!! Our ze should have been 0.10ohms (not 0.12ohms) it’s not a biggy though!!!
Yes as you mentioned ring final calcs would be good, maybe a calc for running a new sub main to a new shed supply (or something bigger)
Great videos keep them coming👍👍
Ha yeah you are prob right. Still complies though right 😬🤞.....prob still had the other example in my head.
In the real world I use a spreadsheet that calculates in one direction and then another to ensure it returns to the start point. This takes into account my dyslexia and stops me installing a dodgy circuit but does make teaching hard..... I sometimes say it's deliberate to check if my students are paying attention but alas..... Tis not 🤫🤐
Hi, great vid, since you stated no concern of overload could you not design using Ib to obtain the line conductor sizes, giving an It of about 48A?
Oh yes, and if you want to earn money doing that circuit i suggest you do :-) I worry about people misunderstanding so went for the safe version......Perhaps i could do a part two where i get the cable size to a economical size?
Hi Craig FYI we can hear you properly in the 1st minute, music too loud and verbal audio too low.
Yes I think I re did this video with better audio. Weirdly Noone has watched that one. 😂... If not il redo.
@@cestemshow 😆Stick a link to it please, I am on a mission to learn as much about design as I can. Gearing up for Level 4 sometime but struggling for information and courses that are UK based. I'll have a good look through your videos and see what else you have on the subject