Testing

[fattony]

Ok Im fairly new to testing but a job our company is doing is going to be inspected by a 3rd party who is registered NICEIC, my question is that my R1+R2 reading is similar to my Zs reading, does this sound right?

 

[Spark123]

I suppose, although this will vary depending on your Ze.
Zs = Ze + (R1+R2)

 

[fireman22]

readings are the same on what circuit tho

 

[fattony]

6A lighting circuit, r1 + r2 on 1 circuit is 1.5ohm and the zs is 1.6ohm, is it possible for r1+r2 to be the same value as Zs?

 

[dingbat]

Did you null out your test leads when you measured (R1 + R2)?
How good was your probe contact with the conductors?
Are there any possible parallel paths to earth?
How different was the ambient temperature when the two measurements were taken?

The results you have are not at all unlikely, by the way. And the inspector wil get slightly different values again when he tests. Don't worry about it, but do tag along if you can; you might learn a lot.

 

[RMS]

Agree with dingbat,

normally zs can be slightly lower as parrallel paths through bonding etc can reduce impedance.