My Loop Zs result should match my calculated, Ze+(R1+R2) value?
There are a lot of factors why the measured Zs results will always be higher than the calculated result, especially when an RCD is fitted for protection. Technology and IT equipment is evermore increasing in our homes and offices, creating distorted waveforms due to noise on the relevant circuits. Although manufacturers are continuously developing new methods to overcome some issues, this issue will never be eradicated. More commonly, electricians can experience RCD uplift, RDC coils are becoming ever more inductive as the market growth is driving the price of components down. Commonly, your loop measurement will always be higher due to the different method each manufacturer used to measure Earth Loop Impedance.
THERE IS A SOLUTION…

Di-log’s new low current ‘Expert Loop Technology’ RCD-LOC XLT has been 5 years in development and has now been proven to be the most accurate method to test Earth Fault Loop Impedance in a circuit which is protected be an RCD or RCBO. The RCD-LOC XLT feature is fitted in our NEW DL9118 17th Edition Multifuction Tester, click here for more information.
