New PDF release: 16th Edition IEE Wiring Regulations: Design and Verification

By Brian Scaddan IEng; MIIE (elec)

ISBN-10: 0750621362

ISBN-13: 9780750621366

This e-book builds at the simple wisdom and methods lined in sixteenth variation IEE Wiring rules defined and Illustrated, offering the knowledge and revision fabrics wanted for the town & Guilds 2400 (Design, Erection and Verification of
Electrical Installations) examination. All Qualifying Managers might be required to achieve this qualification, and Brian Scaddans booklet is the precise textual content for all scholars project C&G 2400 courses.

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Additional info for 16th Edition IEE Wiring Regulations: Design and Verification of Electrical Installations

Example text

When testing the continuity of a CPC which is a Figure 21 57 Inspection and testing different size from either phase or neutral, the resulting value R2 should be a quarter of R{ for phase or neutral plus a quarter of RY for the CPC. Method 3 The third method is based on the measurement of resistance at any point across the diameter of a circular loop of conductor (Figure 22). As long as the measurement is made across the diameter of the ring, all values will be the same. The loop of conductor is formed by crossing over and joining the ends of the ring circuit conductors at the fuse board.

Testing This involves the use of test equipment and there are several important points to be made in this respect. 1 Electronic instruments must conform to BS4743 and electrical instruments to BS5458. 2 The Electricity at Work Regulations 1989, state an absolute requirement in Regulation 4 (4), that test equipment be maintained in good condition. Hence it is important to ensure that regular calibration is carried out. 3 Test leads should have shrouded/recessed ends and/or when one end is a probe, it should be insulated to within 2 mm of the tip and have finger guards.

Note It is often desirable to make allowance for future additions to trunking systems, but care must be taken to ensure that extra circuits do not cause a change of grouping factor which could then de-rate the existing conductors below their original designed size. Drawings Having designed the installation it will be neccessary to record the design details either in the form of a schedule for small installations or on draw40 Design ings for the more complex installation. , type. The following figures indicate some typical drawings.

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16th Edition IEE Wiring Regulations: Design and Verification of Electrical Installations by Brian Scaddan IEng; MIIE (elec)

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