Calculating lb and voltage drop

[Penance]

Pre empting my 2382 and trying to calculate lb so as I can calculate voltage drop.

Circuit I have used for this is an upstairs lighting circuit, 1mm2 t&e 4 light points and length of approx 19m.

Cable installed to ref method C.

Getting myself a bit confused but this is what I think I should be doing:

Using the OSG app 5 table 1a I assume a load of 400 watts, 1.818A.
Is this actually lb or should I apply diversity?

 

[pushrod]

Yes mate, it all helps.

I think I may have been using wrong table in OSG. Saying that I would still be happier installing 10mm on a 50a mcb.

yep - definitely agree when installing. Same with cookers makes sense to put slightly bigger cable in to leave scope for a future upgrade.

 

[Penance]

It's the way I was taught during app days.