I have been thinking about this and loop testing just isn’t as exciting as it used to be,

My original tester a Robin KTS1620 uses a 25 amp current for a loop test on the 20 ohm range, whilst my latest tester a Megger MFT741 uses a 4 amp current for the high loop test and a lower pulsed current for no-trip loop testing.

You don’t get the arcs, sparks and crackling noises with the modern testers that test with less than a sixth of the current the older testers use.

Hi Sparkingchip. I also own the Robin and agree it was a satisfying feeling once the result was displayed. But with the use of residual current devices in domestic installations now renders loop testing redundant for final circuits. Instead, the values of R1+R2  added to Ze  and recorded.

Hi Sparkingchip. I also own the Robin and agree it was a satisfying feeling once the result was displayed. But with the use of residual current devices in domestic installations now renders loop testing redundant for final circuits. Instead, the values of R1+R2  added to Ze  and recorded.