16th edition IEE wiring regulations : explained and by Brian Scaddan PDF

By Brian Scaddan

ISBN-10: 0080488056

ISBN-13: 9780080488059

This re-creation brings this functional publication into line with the sixteenth version of the IEE Wiring rules which was once released in may possibly 1991. Brian Scaddan is the writer of "Wiring structures and Fault discovering for install Electricians".

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2 Q: Do I have to bond radiators in a premises to, say, metal clad switches or socket outlets etc.? A: Supplementary bonding is only necessary when extraneous conductive parts are simultaneously accessible with exposed conductive parts and the disconnection time for the circuit concerned cannot be achieved. In these circumstances the bonding conductor should have a resistance R ≤ 50/Ia , where Ia is the operating current of the protection. 3 Q: Do I need to bond metal window frames? A: In general, no.

If, added to this, there is a low-resistance earth return path, the protection should operate fast enough to prevent danger. ] The resistance of such an earth return path will depend upon the system (see the next section), either TT, TN–S or TN–C–S (IT systems will not be discussed here, as they are extremely rare and unlikely to be encountered by the average contractor). 30 Earthing Earthing systems (IEE Regs Definitions (Systems)) These have been designated in the IEE Regulations using the letters T, N, C and S.

In the event of a circuit that is supplied from a source developing a live fault to an exposed conductive part, there would be no path for shock current to flow: see Figure 16. Once again, great care must be taken to maintain the integrity of this type of system, as an inadvertent connection to earth, or interconnection with other circuits, would render the protection useless. Exemptions (IEE Regs 471–13) As with most sets of rules and regulations, there are certain areas which are exempt from the requirements.

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16th edition IEE wiring regulations : explained and illustrated by Brian Scaddan

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