Help with EICR code!

[MDJ]

I do not think there is a reg number, this is the basic guide to standard circuits that gives the "standard" types of circuits that you can install and then specifies the maximum lengths and the reasons for these, it is quite a large table over several pages.
Basically it is if you do not want to calculate anything, this is a guide to limits.

oh okay, I see cheers.

 

[Badged01]

Its not a reg as such, just guidance/interpretation of the regs for standard circuit designs based on set conditions (e.g. assumes TN-C-S Ze = 0.35 ohms). Could have saved me bags of time doing all my circuit design calcs by hand from 1st principles!!

Need to read the OSG more ........

 

[sparkymalarky]

I would only be concerned if the end to end tests were way out from each other say : Line 0.48 Neutral 0.68. Rule of thumb is 0.05 Ohms. Anything more than this and then it comes down to one or more connections being poorly made etc. I would be happy if the end to end readings were appropriate, insulation resistance was satisfactory and that the Zs values conformed. Also if you scan through BGB, it notes that ''historically a limit of 100m² has been adopted''. This is purely a guide.

 

[Geoffsd]

Does any one know what relevance 100 square metres has to anything. ?

A ring around a 10m square area would only be 40m.

50m x 1m would be 102m.

 

[telectrix]

Does any one know what relevance 100 square meters has to anything. ?

A ring around a 10m square area would only be 40m. but with 10 sockets, 2.5m drop per socket that's another 50m of cable.

50m x 1m would be 102m.

see above.

 

[Geoffsd]

So the area has nothing to do with it, then

 

[hoppy]

Thanks for the replies

so matter how long the circuit is as long as th end to ends are ok and the zs is below 1.15 then there are no real issues with circuit length?

 

[sparkymalarky]

Obviously voltage drop should be verified!

 

[brman]

Obviously voltage drop should be verified!

how are you going to do this on a periodic inspection?

 

[sparkymalarky]

how are you going to do this on a periodic inspection?

How do you think?

It's not hard to briefly check voltage at both the distribution board at both ends of a cable using your test instrument. I often do it on larger runs within manufacturing sheds, Factories etc. due to high load currents, additions to the circuit drawing extra currents etc. Albeit this is more than likely domestic so it probably won't apply but still.

 

[brman]

How do you think?

It's not hard to briefly check voltage at both the distribution board at both ends of a cable using your test instrument. I often do it on larger runs within manufacturing sheds, Factories etc. due to high load currents, additions to the circuit drawing extra currents etc. Albeit this is more than likely domestic so it probably won't apply but still.

Well, you are right, I shouldn't make assumptions about it being domestic but then we are talking about a ring final and recommended floor area here........

 

[brman]

btw. Sparkymalarky: your PM inbox is full.......

 

[sparkymalarky]

Try now brman.