By Institution of Electrical Engineers
A consultant to electric inspection and trying out. it really is a part of a chain of manuals designed to enlarge the actual necessities of part of the sixteenth variation Wiring rules. all the publications is greatly cross-referenced to the rules therefore offering quick access. a few tips Notes comprise info now not integrated within the sixteenth version yet which used to be incorporated in prior variations of the IEE Wiring laws. all of the courses were up-to-date to align with BS 7671:2001.
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Additional resources for Guidance Note 3: Inspection and Testing (Iee Guidence Notes)
Note 1 (R1 + R2) is the sum of the resistance of the phase conductor R1 and the circuit protective conductor R2. Note 2 The reading may be affected by parallel paths through exposed-conductive-parts and/or extraneous-conductive-parts. It should also be recognised that test methods 1 and 2 can only be applied simply to an ‘all insulated’ installation. Installations incorporating steel conduit, steel trunking, micc and thermoplastic/ swa cables will introduce parallel paths to protective conductors.
5 is recorded in the Schedule of Test Results (col 7). R2 is corrected for temperature using Tables 1C or 1D in Appendix 1 of this Guidance Note and compared with the value in Table 41C of BS 7671. Earth fault loop impedance test voltage The normal method of test employed by a phase earth loop tester is to compare the unloaded loop circuit voltage with the circuit voltage when loaded with a low resistance, typically 10 ohms. This method of test can create an electric shock hazard if the phase earth loop impedance is high and the test duration is not limited.
Insulation resistance test between the protective conductor or exposedconductive-parts of other circuits, or to extraneous-conductiveparts. 5 megohm. Instrument: Use an insulation resistance tester for this test. 4. (ii) all socket-outlets must be inspected to ensure that the protective conductor contact is connected to the equipotential bonding conductor (iii) all flexible cables other than those feeding Class II equipment must be inspected to ensure that they embody a protective conductor for use as an equipotential bonding conductor (iv) operation of the protective device must be verified by measurement of the fault loop impedances to the various pieces of connected equipment, with reference to the type and rating of the protective device for the separated circuit.