Making a device to test an RCD is easy; a resistor between hot and the protective ground circuit would do. [Callan] over-engineers. He used a 50 W resistor where 30 W would do under the worst ...

If you’re interested in connecting a new circuit, here’s how to do it. A simple circuit tester with two probes can help ...

Here's what to do: First, verify that the tester works by checking a known live circuit. Hold the tester to a powered ...

Enough is never enough. Although [David Johnson-Davies] has a couple of multimeters lying around, he still felt the urge to build a stand-alone continuity tester and has posted details for a super ...