@stephenboden3558 Yes same principle. In column 1 of table I1 OSG there are line conductor only, milli ohm per metre values. Use that value as the individual R1 or individual R2 value. For instance, the milli ohm per metre value of 6mm copper earth cable would be 3.08
If you do not know the size of the cpc, then you match it to the size of the line conductor. In this instance, the live was 6mm. Looking at table I1 OSG, the milli ohm per metre value of 6mm live and 6mm earth is 6.16. This value is used to find out R1+R2 which eventually leads to the adiabatic equation of calculating S, the minimum csa size of the cpc
Quick question. If calculating r1 only, (seen that in an exam question) I'm assuming it's the same principal.
@stephenboden3558 Yes same principle. In column 1 of table I1 OSG there are line conductor only, milli ohm per metre values. Use that value as the individual R1 or individual R2 value. For instance, the milli ohm per metre value of 6mm copper earth cable would be 3.08
Where do you get those book tabs?
For the book tabs and loads of other formula sheets and guides, visit
www.electricalstudent.co.uk
How do I get the book
Hi there, from any electrical wholesaler in your area or from Amazon or a local book store. The On Site Guide usually costs around £30
Nice video
Thanks bud
I still couldnt understand where that 6.16 came from while i was expecting 2.5
If you do not know the size of the cpc, then you match it to the size of the line conductor. In this instance, the live was 6mm. Looking at table I1 OSG, the milli ohm per metre value of 6mm live and 6mm earth is 6.16. This value is used to find out R1+R2 which eventually leads to the adiabatic equation of calculating S, the minimum csa size of the cpc
Thank you@@ElectricalStudentsUK