ABSTRACT
This chapter describes the tests routinely carried out on low voltage installations; and the testing of apparatus and equipment, and the precautions against electrical injury that should be taken in test facilities. Tests should be carried out at the origin of the installation, at each distribution board, at all fixed equipment, at all socket-outlets, at the furthest point of every radial circuit, and at a sample of lighting outlets. Insulation resistance tests are carried out on isolated systems with the purpose of detecting any degradation in insulation and short circuits between live conductors and between live conductors and circuit protective conductors connected to the installation's earthing arrangements. Loop impedance tests are carried out to determine the loop impedance between the power source and the point in the installation where the test is done and are an essential component of checking the effectiveness of fault protection using automatic disconnection.
