A Practical Guide to the Wiring Regulations by Geoffrey Stokes

By Geoffrey Stokes

This ebook offers an intensive, useful consultant to the Wiring rules BS 7671 : 2001. It beneficial properties in particular:

- worked layout examples

- extensive tabular fabric and checklists

- numerous illustrations

- particular cognizance to the topics of inspection, trying out, verification, certification and reporting

- NICEIC specimen certificate and different forms

- guidance on specialized installations

The 3rd variation has been up-to-date to take account of the 2001 amendments to the Wiring laws, together with revisions on:

- protection opposed to overcurrent

- isolation and switching

- zoning necessities for destinations containing a bathtub or shower

- construction website installations

- highway strength offers and highway furnishings and gear

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Extra resources for A Practical Guide to the Wiring Regulations

Example text

As required by the Electricity Supply Regulations 1988, as amended, a supplier is obliged to provide this information which is usually done by quoting a maximum value of prospective short-circuit current.

Section 131 ± Design Section 132 ± Selection of electrical equipment Section 133 ± Erection, verification and periodic inspection and testing of electrical installations. The first section (Regulation 131±01±01) deals with provisions for which the installation has been designed, in terms of protecting persons and livestock, and property. For the first time, there is provision for the proper functioning of the installation for the intended use. Regulation 131±02±01 addresses the supply characteristics in terms of current, nominal voltage and earthing arrangements, together with calling for the supplier's requirements to be determined.

The measurement taken between phase and neutral at the origin will give the phase-neutral (P-N) short-circuit current and that between phase and the main earthing facility will give the earth fault current. Similarly, phase-phase (P-P) and three-phase prospective fault currents can be obtained in a comparable way. It must be remembered that the values so obtained relate to the particular time at which the tests were undertaken and that allowance should be made for any increase likely to occur due to modifications of the supply network, which should always be regarded as dynamic ± this is particularly important when the supply is derived from the public network.

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