stuck on a Cable Calc

[BAYEUX]

Afternoon chaps. I'm new here, hope i've posted in the right place.

My tutor has asked a cable calculation question i just can't get my head round.

senario is this, there are already 10 lighting points in a house when a customer asks for 2 x twin wall lights to be added. i have to show with calculations if it would be necessary to install a seperate circuit.

The size of the existing cable or MCB haven't been given

My understanding is that a max of 1300w is to be used for a standard lighting circuit, 1.5 twin and earth, with a 6A MCB.

any ideas greatly appreciated

 

[mags1972]

I too allow the 100W max for a light fitting but these days you have to consider a 50W max for all the god damn downlights people are having fitted!!!

 

[Bright Sparks]

Diversity is fine unless you have women or Kids in the house. You come home and every damned light is on OR it's completely dark as all the fuses have blown !

 

[mags1972]

Diversity is fine unless you have women or Kids in the house. You come home and every damned light is on OR it's completely dark as all the fuses have blown !

Lol, we must share the same house