4mm or 2.5

[scotsparky]

yup 16a a leg 2.5 no worries.

 

[ezzzekiel]

because a ring final has always been standardised at 2.5 that is the norm, but as an electrician it is up to you to decide on the installation conditions and the cable size needed and certainly cost shoud not be a factor.

 

[scotsparky]

ezzz i know but the post said its now 4mm for 32a rings

 

[flukey]

all depends on site conditions. remember all installations are different. do the cable calcs for the site in question and that will tell you your cable size. always works for me

 

[scotsparky]

i said that at first on my first post in thread flukey

 

[flukey]

i said that at first on my first post in thread flukey

sorry scot, just repeating as noone seems to have listened
personal preference is just that, its the cable calcs that decide, that is after all what we trained for, so im with you scot

 

[Mac]

Cable Size Selector Calculator and online cable selector for electricians

Try this chaps.A calculator for every cable and occasion

 

[happygilmore]

would it not be 2.5 radial on 20a breaker (up2 50 mtr sq)

4.0 radial 32 a breaker (75 sq mtr)

and still a 2.5 ring.

arn;t ring mains a bit old hat now? radial's the way forward!!!!

 

[iceman]

2.5 mm cable will be fine depending on the length of cable run? u'll hav to apply tempeture multiplyer when you use calculation this will shorten ya length of cable to meet disconnection times stated in the regs, if your ring circuit run of cable is upto 30m long tht should be fine as long as your usein a 20A type B circuit breaker if your usein 4mm cable u'll need 32A circuit breaker this will be within the limits of the times in the regs book and voltage drop, ring circuits are the best option rather thn radials if you installing many sockets