Eicr ring main readings

[cliffed]

Would you guys be happy with these readings on ring main,Rcbo c type 30ma/32 amp.
r1 1.87...rn 1.91 cpc 3.20....R1 +R2.1.26.
zs 1.46 ohms.

 

[Gary latto]

Sorry to hijack the post but for someone still learning how do you work out the length of circuit from the readings ie what would the formula be please ? Tia

 

[Julie.]

Sorry to hijack the post but for someone still learning how do you work out the length of circuit from the readings ie what would the formula be please ? Tia

Look in the on-site guide, appendix, I think it's table 11

It gives the R1+R2 resistance per metre

So for 2.5/1.5 it's around 19.5 miliohm per metre if you know the length, it's length x this value, if you know the overall resistance it's the resistance devided by the resistance per metre

You could also work it out from R1 for 2.5mm2 per metre, plus R2 for 1.5mm2 per metre

These values are also in the table

 

[Gary latto]

Thanks Julie appreciated ?

 

[Pretty Mouth]

For a ring final, use an end-to-end reading, eg. the line conductor r1.

Length of conductor = resistance of conductor ÷ resistance of conductor per meter

For a 2.5mm² conductor, resistance per meter is 7.41mΩ, or 0.00741Ω. So:

Length of conductor = r1 ÷ 0.00741

 

[Gary latto]

Cheers pretty mouth ?