4mm radial

[sedgy34]

has anyone spured off a 4mm radial in 2.5mm on 75 mtrs circuit length on 32A mcb

 

[telectrix]

IMO, it's similar to spurring a single outlet from a 2.5mm rfc. as long as it's only 1. othewrwise a FCU would be required.

 

[Plonker 3]

But you can spur off a socket on a ring final circuit in 2.5mm to one point and that is acceptable. Although doing what the OP has stated isn't

Haven't got the BGB to hand but I didn't think it was allowed to take a spur from a radial power circuit :leaving:

 

[Engineer54]

As already explained, your not spurring on a radial circuit, your either extending, if taking the supply from the end of the radial, or branching if taking the supply from anywhere else along it's run...

 

[Clarkey65]

Hey guys try looking at appendix 15 of the regs all the answers are there.

 

[sedgy34]

But you can spur off a socket on a ring final circuit in 2.5mm to one point and that is acceptable. Although doing what the OP has stated isn't

ummmm interesting quote are you 100% on that

 

[sedgy34]

Hey guys try looking at appendix 15 of the regs all the answers are there.

you plonka spoilt the best thread and debate of the day :frown2:

 

[Clarkey65]

sorry sedgy34 only thought i was helping!

 

[Top Cat]

3 X 4mm = 12mm ...most UK accessory cable terminations are now only suitable upto 10mm. Even then, the terminal screw is at it's most extended position, and often clear of any screw shields... Getting a 2.5mm into a terminal that already has 2 X 4mm is a bit of a struggle!! These cable terminals were at one time, suitable upto 12mm but was a while back....

When did this change, i cant see any difference now than 5 or 10 years ago years ago.

 

[sedgy34]

sorry sedgy34 only thought i was helping!

lol :cheesy: it is a question i put to the scam assesor he just said they must have done the calc on it!

 

[rich.250]

My question would be how is it installed,
Ccc and volt drop.
Also you can have a unprotected spur up to 3m to serve one point.
IMO I'd be questioning extending a 4mm radial that length at all lol

 

[Top Cat]

3 X 4mm = 12mm ...most UK accessory cable terminations are now only suitable upto 10mm. Even then, the terminal screw is at it's most extended position, and often clear of any screw shields... Getting a 2.5mm into a terminal that already has 2 X 4mm is a bit of a struggle!! These cable terminals were at one time, suitable upto 12mm but was a while back....

MK Technical:-http://www.mkelectric.com/Documents/English/EN%20MK%20Technical%20Specifications/T02%20LOGIC%20PLUS%20Tech%20355-389.pdf

 

[sedgy34]

My question would be how is it installed,
Ccc and volt drop.
Also you can have a unprotected spur up to 3m to serve one point.
IMO I'd be questioning extending a 4mm radial that length at all lol

Answer appendix 15

 

[kingeri]

What are the Zs like on a 4mm radial of that length? I wish 4mm used a 2.5mm CPC TBH.

 

[Top Cat]

What are the Zs like on a 4mm radial of that length? I wish 4mm used a 2.5mm CPC TBH.

^^^^^agree^^^^^

 

[yellowvanman]

What are the Zs like on a 4mm radial of that length? I wish 4mm used a 2.5mm CPC TBH.

Doesn't really matter as it should be protected by an RCD anyway!