4mm or 2.5

[leekemp85]

Should a 32 amp ring circuit going through insulation in a new extention be wired in 4mm or would 2.5 still be ok.
I know 1.5 for the lights is ok if rated at 6 amps

many thanks

 

[scotsparky]

should be as long as its a small section of insulation. double check with the cable calcs.

 

[leekemp85]

Is there a program to do cable calculations. I have only just gone self employed.
The old boss used to do all the calculations

 

[Mac]

Is there a program to do cable calculations. I have only just gone self employed.
The old boss used to do all the calculations

SmartGauge Electronics - Selecting the correct size and type of cable

Hope this is of some help
Solutions Electrical Software UK

Found this one mate.Does it all except install it for you.Bit pricey depending on which one you want

 

[Spudnik]

4mm definitely sounds like a good plan to me. I do most of the time.

Easier to install too as its stranded.

 

[kung]

I do 2.5mm for radial and 16A-20A and 4mm for ring and 32A. as Jason says calcs is a must !

 

[lewlec]

hi

4mm rings now if on 32amp mcb, because you cant dictate where the insulation goes.... the person who lays the stuff doesnt care about the cables! ive been putting kitchen and utility on 4mm rings and 32amp mcb and for bedrooms and lounge i still do them in 2.5mm but put them on 20amp breakers. 4mm is a bit costly though

 

[Mac]

hi

4mm rings now if on 32amp mcb, because you cant dictate where the insulation goes.... the person who lays the stuff doesnt care about the cables! ive been putting kitchen and utility on 4mm rings and 32amp mcb and for bedrooms and lounge i still do them in 2.5mm but put them on 20amp breakers. 4mm is a bit costly though

What about the older houses.The only place you will find insulation is in the loft

 

[kung]

Good old thermal effects !

 

[Spudnik]

4mm is a bit costly though

Cheaper than an insurance claim!!

 

[lewlec]

hi

yes true, should have said i was talking about new builds.

 

[Mac]

4mm definitely sounds like a good plan to me. I do most of the time.

Easier to install too as its stranded.

But if you quote to do a job and you price up for 4mm,that will raise the price.If another sparks comes along and quotes for 2.5mm,who is wrong.On a rewire you will normally have 3 rings,kitchen,upstairs and downstairs.Why would you want to use 4mm.Sorry mate not being picky,but an average sized house would not need 4mm.Majority of the times all short runs

 

[lewlec]

Cheaper than an insurance claim!!

aye....very true!

 

[scotsparky]

when did the $mm ring come in? Brb says 4mm for 32 A Radials but still ok for 2.5 rings Is ther ammendmens again????

 

[Mac]

when did the $mm ring come in? Brb says 4mm for 32 A Radials but still ok for 2.5 rings Is ther ammendmens again????

Agree mate.A ring is potentially 5mm(2 conductors)