Zs on Minor Works

[carl9254]

If you are adding something on a circuit, ie another light, fan etc, when doing the r1+r2 do you get that from the part of circuit you have added or from the last in line point on that circuit??

Thanks.

 

[i=p/u]

furthers point isnt it

 

[telectrix]

do you mean R1+R2? totally different to r1 and r2. R1+R2 is highes reading from all points on the circuit.

 

[carl9254]

So if its not practical to add your circuit from the furthers point on the circuit, then you still dont need to test your circuit??

Thanks.

 

[carl9254]

do you mean R1+R2? totally different to r1 and r2.

Yes sorry R1+R2

 

[telectrix]

wherever you add, you still have to test. suppose you connected say a light half way along the radial circuit, and had snapped a cpc when tightening, you would then not get a reding further along the radial. so, last point on the radial should give the highest reading and prove continuity for the full length of the circuit.

 

[carl9254]

Yes so basically test both but record he highest value which should obviously be the further est point. Just wasnt sure which i had to record.

Thanks.

 

[telectrix]

yep, test at your fitting and at the furthest point. record the highest values. R1+R2 and Zs. compare Zs with max. allowed for the MCB/Fuse