Frequently asked questions


Why does my meter display 50v when performing an RCD test?

This is known as touch voltage. It is requirement of the regulations that a measuring instrument cannot create a situation whereby 50v or greater could be passed into the earth system. The tester will check the mains supply in all configurations, it the result shows that the 50v rule could be breached further tests are inhibited. If this occurs check appliances are not connected to the supply under test as leakage currents from these could be causing the problem.