Megger lrcd220 non tripping loop and rcd tester megger lrcd220 de sc the megger lrcd220 is from the latest generation of combined non tripping loop tester and rcd test instruments that provide simple affordable and flexible test tools for electrical contractors testing energised circuits this instrument provides three phase safe non trip loop testing and 1 2i i and 5i rcd testing for standard selective and dc rcds it also offers 2 wire fast testing plus phase to phase and phase to eart