By Brian Scaddan
This re-creation brings this sensible e-book into line with the sixteenth variation of the IEE Wiring laws which was once released in could 1991. Brian Scaddan is the writer of "Wiring platforms and Fault discovering for install Electricians".
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Additional info for 16th edition IEE wiring regulations : explained and illustrated
However, we can protect against both of these conditions with the following methods. Separated extra low voltage (SELV) This is simply extra low voltage (less than 50 V AC) derived from a safety source such as a class 2 safety isolating transformer to BS 3535; or a motor generator which has the same degree of isolation as the transformer; or a battery or diesel generator; or an electronic device such as a signal generator. Live or exposed conductive parts of SELV circuits should not be connected to earth, or protective conductors of other circuits, and SELV circuit conductors should ideally be kept separate from those of other circuits.
Protection against ingress of small foreign bodies. 4 Protection against contact with live or moving parts inside the enclosure by tools, wires or such objects of thickness greater than 1 mm. Protection against ingress of small solid foreign bodies. 5 Complete protection against contact with live or moving parts inside the enclosure. Protection against harmful deposits of dust. The ingress of dust is not totally prevented, but dust cannot enter in an amount sufficient to interfere with satisfactory operation of the equipment enclosed.
Are hazardous areas. e. 4 s and 5 s, do not indicate the duration that a person can be in contact with a fault. They are based on the probable chances of someone being in contact with exposed or extraneous conductive parts at the precise moment that a fault develops. See also Tables 41A, 604A and 605A of the IEE Regulations. 37 Earthing Example 1 Let us now have a look at a typical example of, say, a shower circuit run in an 18 m length of 6 0 mm2 (6242Y) twin cable with CPC, and protected by a 30 A BS 3036 semi- enclosed rewirable fuse.