Ring vs Radial

[sedgy34]

That'd make it a ring then?

Only until it stops lol:wink5: then it's a radial

 

[Richard Burns]

It's a hypothetical question..
32a Mcb is overrated for a 2.5 radial, but chuck a couple of cables in and suddenly it's okay..

A 32A MCB is overrated for a radial circuit run in 2.5 but it is not incorrect for one double (or single) socket outlet on 2.5.
Because the nature of the load is such that you cannot have an overload as the socket outlets will use fused plugs that limit the maximum current.

So where there is a situation where there cannot be an overload there is no requirement to provide overload protection, only fault protection and the MCB will provide fault protection.

In your example having a single spur off the MCB for a ring and then removing the ring would be still compliant with the regulations, however you would not be able to add outlets to this (now) radial.

 

[ExArmy]

It's a hypothetical question..
32a Mcb is overrated for a 2.5 radial, but chuck a couple of cables in and suddenly it's okay..

max load is 26A, cable can handle 27A, so theres no problem. it's the same as any spur off the ring

 

[tigerpaul]

A 32A MCB is overrated for a radial circuit run in 2.5 but it is not incorrect for one double (or single) socket outlet on 2.5.
Because the nature of the load is such that you cannot have an overload as the socket outlets will use fused plugs that limit the maximum current.

So where there is a situation where there cannot be an overload there is no requirement to provide overload protection, only fault protection and the MCB will provide fault protection.

In your example having a single spur off the MCB for a ring and then removing the ring would be still compliant with the regulations, however you would not be able to add outlets to this (now) radial.

Okay I see your point now.

Thanks.

 

[dpiers1980]

are you not doubling your csa with a ring making the load you can draw off it higher hence 32a mcb does this not make the ring better for handling more load being drawn off any socket on it ?

 

[T&Earth]

hi there

Reading this thread with interest, changing the subject slightly how are grid switches wired for kitchens, these are becoming more common
Many Thanks

 

[bigbaddave]

hi there

Reading this thread with interest, changing the subject slightly how are grid switches wired for kitchens, these are becoming more common
Many Thanks

Boy i think your right on the "Changing the subject slightly" certainly not on a ring main..

 

[Guest55]

hi there

Reading this thread with interest, changing the subject slightly how are grid switches wired for kitchens, these are becoming more common
Many Thanks

ring or 32a radial to grid box then 2.5 t&e branches to each appliance.
would be one way.

 

[T&Earth]

Hi Biff55

Thanks for replying

Cheers

 

[Dan]

Just bumping some threads in the Electrical Wiring Theories and Regulations forum category here on our Electricians Forums. If this specific topic isn't current, just ignore it, it'll drop off the list in no time. However, if it's something you'd like to contribute to, feel free to reply and bring it back into current discussion.