Spur From Ring

[tonys]

how is a double socket spur on 2.5 protected from overload by a 32A mcb - I still think it's a good question!

The overload is governed by the two 13 amp plug tops, in such much 26amp is the maximum that can be drawn and odds of both the sockets being used to the maximum is very slim and if they were and others sockets were also being used the 32amp mcb would more than likely trip.

Diversity works in the real world, so you have to rely on it along with ones experience.

 

[Deleted member 9648]

It's a discussion!

I'm not arguing but if someone posts that the maximum length for an unfused spur is 3 Metres then I dispute it because it simply is not true!

And it ends when a few more people read this thread and confirm that I'm absolutely correct.

You are absolutely correct.

 

[Chr!s]

I would say overload has been omitted 433.3 due to the nature of the load, that being the fact that only one single or double may be connected.

Protection against fault current would still be provide via the 32 amp mcb.

Socket outlets now require rcd protection so zs wont be the overriding factor it will be the volt drop.

Chris

 

[IQ Electrical]

I would say overload has been omitted 433.3 due to the nature of the load, that being the fact that only one single or double may be connected.

Protection against fault current would still be provide via the 32 amp mcb.

Socket outlets now require rcd protection so zs wont be the overriding factor it will be the volt drop.

Chris

That's assuming a domestic-type situation.

A socket spurred off in an office under the control of etc. etc. in 20mm galvanised conduit or any of the other surface/earthed scenarios will still be limited by Zs and volt drop.

 

[Chr!s]

That's assuming a domestic-type situation.

A socket spurred off in an office under the control of etc. etc. in 20mm galvanised conduit or any of the other surface/earthed scenarios will still be limited by Zs and volt drop.

Well yes i was assuming a domestic situation, though non domestic will not necessarily be excluded from RCD protection, that would be down to designer type of load and any risk assessments etc

Chris