By Brian Scaddan
This new version brings this sensible e-book into line with the sixteenth variation of the IEE Wiring laws which was once released in may possibly 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
A 10 mm2 conductor has approximately 10 times less resistance than a 1 mm2 conductor: 10 mm2 resistance = 1 83 m /m 1 0 mm2 resistance = 18 1 m /m Hence a 70 mm2 conductor will have a resistance approximately half that of a 35 mm2 conductor. 35 mm2 resistance = 0 524 m /m ∴ 70 mm2 resistance = 0 524 = 0 262 m /m 2 which compares well with the value given in Table 2. 0601 0 641 0 443 0 320 0 253 0 164 0 125 01 Hence Zs = Ze + R1 + R2 1 = 0 2 + 0 035 = 0 235 which is less than the Zs , maximum of 0 267 quoted for a 160 A BS 88 fuse in Table 41D of the Regulations.
When this cage arrangement was charged to a high voltage, the assistant found that he could move freely within it touching any of the sides, with no adverse effects. Faraday had, in fact, created an equipotential zone, and of course in a correctly bonded installation, we live and/or work in Faraday cages! 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 ?
By isolation on the front of a control panel where the cover cannot be removed until the isolator is in the ‘off’ position. An intermediate barrier of at least IP2X or IPXXB will give protection when an enclosure is opened: a good example of this is the barrier inside distribution fuseboards, preventing accidental contact with incoming live feeds. 3 By placing obstacles to prevent unintentional approach to or contact with live parts. This method must only be used where skilled persons are working.