Inspection and Testing. A.W.Croucher 2 004 page 37 If equipment disconnection is not a practical proposition, the controlling switch may isolate equipment. But be sure to make an on-site assessment of the chances of a switch line -neutral fault existing. The insulation resistance tester shall be positioned - wherever practicable - at the mains end of the distribution circuit or, alternatively, at the distribution board bus bars. P - E tests All fuses are inserted. Current-using apparatus may remain connected, assuming no N-E shorts exist. Controlling switches should be left on. The previously stated results and qualifications are applicable. Fig.17 Test of insulation resistance between phase and cpc. Three-phase and neutral installations Firstly, in the absence of a 4-pole isolator, the neutral shall be disconnected from the incoming supply in order that a test may be conducted between neutral and earth - neutral being at zero potential. The test shall include the distribution circuit (sub main), with the IR tester positioned at the main distribution board fuse/s. Internal
