Frequently asked questions


Why does my tester show voltage on a dead circuit after an Insulation test has been performed?

This can be due to the circuit under test having a level of capacitance. Some testers look for voltage across the terminals when the test button is not being pressed. There maybe a level of voltage in the supply after an insulation test has been performed. You should see this fall to zero after a few seconds. Always be sure that the circuit is dead and proved dead before carrying out this test. If you are ever unsure obtain a second opinion and test the supply for dead again having proved your own test instrument first.