Radial or ring final

[ccfc]

Butler

What size mcb is this circuit on. Think id treat it as a ring as its not really a conventional way to wire a radial circuit , why bother running two cables to increase csa for great current capacity then spur of it in 2.5 flex with out local fuse to protect it ?. Strange!

 

[Andy™]

isnt there a reg that says te number of unfused spurs must not exceed that of fused spurs/accessories. in which case, if its a ring, it does not comply

 

[green-hornet]

ButlerWhat size mcb is this circuit on. Think id treat it as a ring as its not really a conventional way to wire a radial circuit , why bother running two cables to increase csa for great current capacity then spur of it in 2.5 flex with out local fuse to protect it ?. Strange!

I have done it when fitting a 10mm circuit for a cooker, only to find after delivery that its bigger than stated, so I have run a parralel circuit in 10mm.

 

[butler26]

here steptoe i do no the difference between a ring and a radial i was asking can i test this circuit as a radail because it only has the one appliance on it.i dont no who you think your are trying to put people down all the time you are just a p...y in my eyes so dont anwser any of my post thanks

 

[ccfc]

True Andy

 

[batty]

Well i have wired a few generally put a new circuit in but if thats not possible and it only needs 13 amps will put it on a switch spur of the ring main. Really what ever you shouldn't be taking more than 13 amps of the ring main anyway.

 

[Andy™]

Really what ever you shouldn't be taking more than 13 amps of the ring main anyway.

where as if it was a radial....

 

[ccfc]

Green hornet

Yeh but you wouldnt then spur of it with a smaller cable to feed the cooker

 

[Andy™]

Green hornetYeh but you wouldnt then spur of it with a smaller cable to feed the cooker

possibly... the larger size between CU & appliance may be to reduce VD & Zs etc. you could then use a smaller size to connect appliance, providing it has adequate fault protection

 

[batty]

well i am getting more confused with this so the circuit that supplies shower cubicle only supplies it and it has two pieces of 2.5 at CU but no isolator. What load is the cubicle because that will be the deciding factor as whether its a ring or a radial.

 

[steptoe]

here steptoe i do no the difference between a ring and a radial i was asking can i test this circuit as a radail because it only has the one appliance on it.i dont no who you think your are trying to put people down all the time you are just a p...y in my eyes so dont anwser any of my post thanks

dunno what that means,

put me on ignore then butler,

you come on, ask a basic question,

expect people to talk you through your assessment,

then complain cos I done as you asked and gave you a straight answer,

your a bit touchy arent you?

if you really do know the difference between a ring and a radial then you should know that you cant test a ring as a radial,

and you should therefore know whether you are testing this as a ring or a radial, because you know the difference.

 

[butler26]

i dont no what the load is but i think anywere between 2kw and 3kw

 

[ccfc]

Andy

Your too bloody clever im going to bed

 

[butler26]

it has a 32amp 60898 type B circuit breaker

 

[ProDave]

So you don't know if it's a radial or a ring.

There's no shower isolator.

you don't know the rating of the shower.

The junction box is inaccesible.

The saving grace, is the shower cubicle is moveable.

My suggestion:

You move the shower cubicle to gain access to the rating plate and note it's details.

You then decide if a single 2.5mm is adequate based on the above.

You re route one of the cables to an accessible position for an isolator (disconnect and make safe the other at both ends)

You reconnect the shower to the new isolator and replace.

Select the correct rating MCB for your new circuit, connect and test your new circuit and include this in your assessment.

 

[batty]

So its wired into consumer unit without local isolation.

 

[Badfish]

I'm with pro Dave here,I should do as he says.

 

[batty]

Specially for an assessment.

 

[green-hornet]

I agree with all the above

 

[Chr!s]

hi to allive asked this question here before but didnt get a straight answer so i need some advise here please .ive an assessment coming up soon so testing my circuits .the one im confussed with is i have a fancy shower the runs of my boiler so it is not an electric shower,but it needs power to operate the radio lights and steamer.it was in the house when i bought it. the circuit has been wired like a ring final in 2.5mm t.e with a length of 2.5mm flex spurred from a junction box under the floor to the control unit wich powers radio and other accessories, there is nothing else wired to this circuit just the shower control unit. is the a ring or is it realy a radial where they used 2 pieces of 2.5mm to double up the crass sectional area.advice need urgently

thanks

Is it a final circuit, yes

Are the conductors connected to a single point and form a ring,? if yes

Its a ring.