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Although all reference to BS 3871 MCB’s have been removed from BS 7671, they are still used and therefore worthy of mention. 5 10 Icn is the rated ultimate breaking capacity. Ics is the maximum breaking capacity operation after which the breaker may still be used without loss of performance. Fuse and circuit breaker operation (IEE Regs 433–02 and 434–03) Let us consider a protective device rated at, say, 10 A. This value of current can be carried indefinitely by the device, and is known as its nominal setting In .

Cable construction A cable comprises one or more conductors each covered with an insulating material. This insulation provides protection from shock by direct contact and prevents the passage of leakage currents between conductors. Clearly, insulation is very important and in itself should be protected from damage. This may be achieved by covering the insulated conductors with a protective sheathing during manufacture, or by enclosing them in conduit or trunking at the installation stage. The type of sheathing chosen and/or the installation method will depend on the environment in which the cable is to be installed.

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. These are listed quite clearly in IEE Regulations 471–13, and there is no point in repeating them all here. However, one example is the dispensing of the need to Isolating transformer Exposed conductive part P 240 V 240 V N No return path for earth fault currents Figure 16 56 Protection earth exposed conductive parts such as small fixings, screws and rivets, provided that they cannot be touched or gripped by a major part of the human body (not less than 50 mm by 50 mm), and that it is difficult to make and maintain an earth connection.

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Additif 80 by CTICM


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