E
Engineer54
As anyone come across a 4mm + 2.5mm RFC protected with a 40A RCBO??
Your opinions please....
Your opinions please....
Discuss Anyone ever seen a 4mm ring circuit like this?? in the UK Electrical Forum area at ElectriciansForums.net
That's a negative Ive seen plenty of Radials done in 4mm i have seen one ring but that was protected by 32A RCBO rather than 40A
What loading does it have on it, is there high load on the ring or just couple of sockets for TV's and lamps?!
I would drop the RCBO to a 32a, but otherwise i dont see any problems. I wouldn't do a ring in 4mm, it will be real donkey work terminating the ends into the sockets, especially if there are any single gang one's.
Cheers...............Howard
Hi-Howard,
I have wired dozens if not hundreds of rings in 4mm2, at commercial + Industrial level of course, and it is easy to use, anyhow back to the original question, is it really a problem I wonder?
i think i've read this a bit differently to you lot. i thought he was saying the circuit has one 4mm leg & one 2.5mm leg. if so, i'd be inclined to treat it as a standard 2.5 ring, and drop the 40amp to a 32amp.
is it not still standard practice to put loads of 3kw and above that are on for lengthy periods on individual radials ?
and if there was loads of insulation under the floor Howard?....as in many newbuilds...I would drop the RCBO to a 32a, but otherwise i dont see any problems. I wouldn't do a ring in 4mm, it will be real donkey work terminating the ends into the sockets, especially if there are any single gang one's.
Cheers...............Howard
looks like you're right. it just seemed a strange question, as i've done a fair few 4mm rings, so they're not that unusual. i thought e54 must be throwing us a googly and trying to make us think.I think the 2.5 is the cpc
i thought e54 must be throwing us a googly and trying to make us think.
E54,
IMO, there is no problem with this arrangement. 'Lollipops' are quite common, unless there is more.....
However, if you feel there is some amiss then you then maybe we aught to change your name to E45 and then apply liberally
Its really a question of probabilities.
Running radials in T&E on tray is not such a good strategy and more likely to get damaged, unless you either cable tied them or ran them in SWA and that would require a lot of fiddling about at the kitchen end.
You could just run a sub-main to a kitchen DB. which again would require more work and also leave the protective devices open to environmental degradation.
It seems an obvious solution to me.
1/ Its quick to install
2/ No environmental damage to the supply and final circuits
i worked with a team of italians, on a big industrial site a couple of years ago. they said that they'd never worked with swa before. apparently it's not used over there.As stated there is NO T&E cables used over here. All wiring is either SWA, or singles in containment, in this case PVC trunking !!
i worked with a team of italians, on a big industrial site a couple of years ago. they said that they'd never worked with swa before. apparently it's not used over there.
all this talk about deep fried lollipops is making me hungry.And now the latest, ...lol!! Went to have a look just before lunch time today, and the head cook has decided he wants more equipment to be connected to this 4mm ring, another 9KW of deep fat fryers (3 No) no less!! So the upstart is, that they are now installing another 4mm ring to this area.
I by the way, have no objection to the 40A rcbo 4mm FRC's. The change from lollipop ring to standard ring, was the call of the contractors supervisor. Which may of been based on me not allowing a similar arrangement in a project building!! ...lol!!
Reply to Anyone ever seen a 4mm ring circuit like this?? in the UK Electrical Forum area at ElectriciansForums.net
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