Temporary Hybrid/Lollipop Circuit

[UNG]

This I don't understand. Using Table 4D5 clipped direct 4mm has capacity for 37A, 2.5mm has 27A (so using a ring 54A). Both well within the breaker capacity of 32A. So why would my option not be viable?

Why are you using the clipped direct figures when the existing cables are buried in plaster and I assume your new cables will also be buried in plaster. For 4mm² T&E buried in plaster you are looking at 26 - 27A so your lolipop fails at the start as I doubt it is all clipped direct allowing you the 37A you quote. The reference methods are there for a reason and you can't just pick the figures that suit your needs

Unless you have followed the route of the existing cabling it is likely that the skts are not in order on the ring through each room also adding skts as you go would more than likely cause more issues than it solves

 

[tvrulesme]

Why are you using the clipped direct figures when the existing cables are buried in plaster

As I put in the original post this will be clipped direct. In reality this will be clipped direct up to the point of the 1st socket which is the only part I am doing now after which it goes to 2.5mm ring. So not picking figures that suit my needs, more what is intended to be followed

Now in future when it switches to a 4mm radial throughout the other rooms will indeed be burred in plaster at which point I would need to switch to a lower breaker

 

[tvrulesme]

For 4mm² T&E buried in plaster you are looking at 26 - 27A

Also are you sure about this? Reference method C I have seen referred to as "Clipped directly to the surface / buried below the surface on a plastered wall."

Method C

• Clipped to a wall or ceiling.
• Buried direct in plaster.
• SWA running down wall.

reference method explained - https://www.electriciansforums.net/threads/reference-method-explained.70017/

 

[UNG]

Also are you sure about this? Reference method C I have seen referred to as "Clipped directly to the surface / buried below the surface on a plastered wall."

Method C

• Clipped to a wall or ceiling.
• Buried direct in plaster.
• SWA running down wall.

reference method explained - https://www.electriciansforums.net/threads/reference-method-explained.70017/

Maybe I read the regs differently to you
Read the notes for Table 4D5 then refer to Table 4A2 as the notes suggest and Installation Method 20 does not look like a cable is buried in plaster

 

[tvrulesme]

Read the notes for Table 4D5 then refer to Table 4A2 as the notes suggest and Installation Method 20 does not look like a cable is buried in plaster

I read TABLE 4A2 Number 57



Which refers to note o


Which states Reference Method C