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

By Brian Scaddan

This new version brings this useful ebook into line with the sixteenth version of the IEE Wiring laws which used to be released in may well 1991. Brian Scaddan is the writer of "Wiring platforms and Fault discovering for set up Electricians".

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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. 6 Complete protection against contact with live or moving parts inside the enclosures. Protection against ingress of dust. 53 Protection Second numeral: liquid protection 0 No protection. 1 Protection against drops of condensed water.

Return path, either metallic or earth. earthed neutral of the supply transformer. transformer winding. phase conductor from the transformer to the fault. Figure 12 is a simplified version of this path. We have: Zs = Ze + R1 + R2 33 Earthing Figure 11 where Zs is the actual total loop impedance, Ze is the loop impedance external to the installation, R1 is the resistance of the phase conductor, and R2 is the resistance of the CPC. We also have: I = U0c /Zs where I is the fault current and U0c is the voltage at the supply transformer (assumed to be 240 V) (Appendix 3 BS 7671).

RCBO’s are combined circuit breakers (CB’s) and RCD’s in one unit. For construction sites and agricultural environments this value is reduced to 25 V. Principle of operation of an RCD Figure 14 illustrates the construction of an RCD. In a healthy circuit the same current passes through the phase coil, the load, and back through the neutral coil. Hence the magnetic effects of phase and neutral currents cancel out. In a faulty circuit, either phase to earth or neutral to earth, these currents are no longer equal.

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