By Brian Scaddan
This re-creation brings this sensible booklet into line with the sixteenth version of the IEE Wiring laws which used to be released in may perhaps 1991. Brian Scaddan is the writer of "Wiring structures and Fault discovering for deploy Electricians".
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Additional resources for 16th edition IEE wiring regulations : explained and illustrated
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 Isolating transformer Exposed conductive part P 240 V 240 V N No return path for earth fault currents Figure 16 57 Protection clearly in IEE Regulations 471–13, and there is no point in repeating them all here.
Clearly, the multiplier is 1 + 20 − 20 . So, for a 70 C, polyvinyl chloride (PVC) insulated conductor (Table 54C IEE Regulations), the multiplier becomes: 1 + 0 004 70 − 20 =12 And for a 90 C XLPE type cable it becomes: 1 + 0 004 90 − 20 = 1 28 Hence, for a 20 m length of 70 C PVC insulated 16 mm2 phase conductor with a 4 mm2 CPC, the value of R1 + R2 would be: R1 + R2 = 1 15 + 4 61 × 20 × 1 2/1000 = 0 138 We are now in a position to determine the total earth fault loop impedance Zs from: Zs = Ze + R1 + R2 36 Earthing Table 1 Resistance of copper conductors in at 20 C Conductor CSA (mm2 ) Resistance (m /m) 10 15 25 40 60 10 0 16 0 25 0 35 0 18 1 12 1 7 41 4 61 3 08 1 83 1 15 0 727 0 524 As previously mentioned, this value of Zs should be as low as possible to allow enough fault current to flow to operate the protection as quickly as possible.
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. 6 Complete protection against contact with live or moving parts inside the enclosures.