vd

[i=p/u]

nice simple 1, and good morning... on a A1 socket ring circuit is the csa 5mm????

is the vd formulae mV/A/m x Ib x L/1000/4 and why?

 

[mogga]

If your dreaming about VD aftermidnight this can be cured using wirebrush and detol

 

[Penance]

Replace the detol with paraffin and scrub it with a stiff wire brush in the morning.

 

[i=p/u]

excuse yous , i am just going through my notes and get ready for assessments.

 

[pushrod]

nice simple 1, and good morning... on a A1 socket ring circuit is the csa 5mm????

is the vd formulae mV/A/m x Ib x L/1000/4 and why?

Take it you mean why the "4" on the ring formula and not on the radial formula. Reason is that the current is not travelling the full length. From the most distant point on the ring final circuit the current can take 2 routes that are in parallel to each other
and
they are only half the total length of the circuit.

edit - and an A1 ring is 2.5mm in plastic insulated cables for floor area of 100m²