By Brian Scaddan
This re-creation brings this functional e-book into line with the sixteenth version of the IEE Wiring rules which was once released in may perhaps 1991. Brian Scaddan is the writer of "Wiring structures and Fault discovering for set up Electricians".
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Extra info for 16th edition IEE wiring regulations : explained and illustrated
Problems 1 What is the resistance of a 10 m length of 6 0 mm2 copper phase conductor if the associated CPC is 1 5 mm2 ? 2 What is the length of a 6 0 mm2 copper phase conductor with a 2 5 mm2 CPC if the overall resistance is 0 189 ? 3 If the total loop impedance of a circuit under operating conditions is 0 96 and the cable is a 20 m length of 4 0 mm2 copper with a 1 5 mm2 CPC, what is the external loop impedance? 4 Will there be a shock risk if a double socket outlet, fed by a 23 m length of 2 5 mm2 copper conductor with a 1 5 mm2 CPC, is protected by a 20 A BS 3036 rewirable fuse and the external loop impedance is measured as 0 5 ?
The conductors used in such connections are called protective conductors, and they can be further subdivided into: 1 Circuit protective conductors, for connecting exposed conductive parts to the main earthing terminal. 2 Main equipotential bonding conductors, for bonding together main incoming services, structural steelwork etc. 3 Other equipotential bonding conductors, for bonding together sinks, baths, taps etc. 4 Supplementary bonding conductors for bonding exposed conductive parts and extraneous conductive parts, when circuit disconnection times cannot be met, or, in special locations, such as bathrooms, swimming pools etc.
50 Protection Figure 15 Mineral-insulated cable. On impact, all parts including the conductors are flattened, and a proportionate thickness of insulation remains between conductors, and conductors and sheath, without impairing the performance of the cable at normal working voltages Polyvinyl chloride PVC is a thermoplastic polymer widely used in electrical installation work for cable insulation, conduit and trunking. General-purpose PVC is manufactured to the British Standard BS 6746. PVC in its raw state is a white powder; it is only after the addition of plasticizers and stabilizers that it acquires the form that we are familiar with.