garden shed supply

clematis432 · Feb 21, 2013

Engineer54 said:
If these MCB's are both Type C, then i would check your Zs complies to be on the safe side!!

Don,t have access to an appropriate test meter for ZS anymore, I will replace these to type B to make sure, cheers.

Deleted member 9648 · Feb 21, 2013

Ducksy said:
Of corse because its a ring the shed feed is a radial i think ccc for 4mm clipped direct is 37amps so well with in size.

It's not a radial...it's a spur,and you can spur off a ring in 2.5mm.

shocking_eg · Feb 21, 2013

wirepuller said:
It's not a radial...it's a spur,and you can spur off a ring in 2.5mm.

but is a DB classed as a spur ? i can understand a socket or a SFCU would be okay as its not possible to overload the cable with one of these

but with a DB you could quite easily pull more than the rated current of the cable if it was fed by a 2.5mm

Deleted member 9648 · Feb 22, 2013

Whatevers on the end it's a spur if it's connected directly to a ring.
A radial is a linear circuit connected to its own OCPD at the CU.

shocking_eg · Feb 22, 2013

wirepuller said:
Whatevers on the end it's a spur if it's connected directly to a ring.
A radial is a linear circuit connected to its own OCPD at the CU.

Yes I know that, I'm just trying to say that you can't obviously spur anything off of a ring final

telectrix · Feb 22, 2013

spurring off a 2.5mm rfc in 4mm is close to extending the rfc, like a reverse lollipop circuit. as long as the OCPDs in the shed are selected to protect the cable, can'r really see a problem with how it's been done.

kingeri · Feb 22, 2013

Only issues would be voltage drop, EFLI and overloading one point of the ring. First and last shouldn't be an issue as he has used 4mm and the load is pretty small. I'd be interested to know how the Zs stack up though.

Edit: Mind you,he has the CPC and armour of the SWA in play, so would probably be OK.

Engineer54 · Feb 23, 2013

telectrix said:
spurring off a 2.5mm rfc in 4mm is close to extending the rfc, like a reverse lollipop circuit. as long as the OCPDs in the shed are selected to protect the cable, can'r really see a problem with how it's been done.

I'll have to remember that one, ....A reversed lollipop circuit!! I like it!! lol!!