Working out V.drop on ring final circuits

[starterspark]

Hi all, I’m just starting out, and have got a bit confused about ring final volt drop.

I understand the normal formula for radials but don’t know the one for ring finals. I’ve looked in my books and can’t find it; can someone please help?
Edit: I have searched and this forum is great! -But I'm still a bit confused as to whether I half the length and Ib, or quarter the length and leave the Ib as is!

So if we have Ib x L x Mv/A/m / 1000; for an 18m 32A Ib ring on normal 2.5/1.5 T/E I work it out to be:
32 x 28 x 18 / 1000 or 16V ! Eeek! –that’s a lot more that 9.2!!

Where am I going wrong?

Thank for any replies

 

[plugwash]

But I'm still a bit confused as to whether I half the length and Ib, or quarter the length and leave the Ib as is!

I think you will find both of those will give the same result.

 

[ban-all-sheds]

Where am I going wrong?

Read your own post and you'll see why:

But I'm still a bit confused as to whether I half the length and Ib, or quarter the length and leave the Ib as is!

So if we have Ib x L x Mv/A/m / 1000; for an 18m 32A Ib ring on normal 2.5/1.5 T/E I work it out to be:
32 x 28 x 18 / 1000 or 16V ! Eeek! –that’s a lot more that 9.2!!

You've done neither....

 

[starterspark]

Thanks, so I can do either then? -I guess it's the same result so I'll get my coat..
Great forum