Three checks which must be carried out on an electrical installation before an installation resistance test is carried out on it are
A) Installation isolated, lamps removed, switches open
B) Lamps removed, installation energised and dimmers bypassed
C) Installation energised, all lamps in place and switches closed
D) Switches closed, installation isolated and lamps removed

Question

Quizplus · Accepted Answer

Before conducting an installation resistance test, it is important to ensure that the installation is isolated to avoid electric shock. Also, all lamps must be removed from the sockets to prevent any interference with the test results. Finally, switches must be opened to ensure that no electrical current passes through the circuit being tested. This makes option D the best choice as it includes all three necessary checks.

Three Checks Which Must Be Carried Out on an Electrical