Reference Methods

[Bez]

Just wading through some plans and jotting down some circuit design notes.

Kitchen & Utility ring is probably going to be a mixture of Ref. method 102 & 103, stud walls full of cellotex. I reckon I'de sleep better if this was done in 4mm T&E. Am I being an old woman?

Oh and by the way, does cellotex affect sheathing the way them old poly balls does?

Cheers

Bez

 

[PC Electrics]

Method 103 drops the rating of even 4mm to 17.5A. Ouch! Can't do a 32A ring on that. Couldn't even do a 20A radial on it.

I would suggest the careful use of noggins to ensure M102 throughout. 2.5 now has a rating of 21A, so you're able to do a 32A ring. 4mm has a rating of 27A so would be better for a 20A radial.

Personally I believe that a 20A radial is fine for most kitchen/utility uses. Most large appliances only pull full load during heating cycles for short periods. Only tumble driers pull full load for extended periods.

 

[Bez]

Method 103 drops the rating of even 4mm to 17.5A. Ouch! Can't do a 32A ring on that. Couldn't even do a 20A radial on it.

Doesn't that give you 35A when wired as a ring with 4mm though?

 

[Andy™]

Doesn't that give you 35A when wired as a ring with 4mm though?

433.1.5 - current carrying capacity of each conductor is to be 20A min.

 

[Bez]

Guess I need to ensure ref 102 then

 

[Andy™]

Guess I need to ensure ref 102 then

that would be easiest solution