TABLE K factors used for calculating minimum earth conductor sizes 1. C (fire risk conditions) Kfactor (BS ) (normal conditions) or (fire risk). Refer Table of BS, the value of k for XLPE insulated copper protective conductor is It is also noted that the assumed initial Calculation for using SWA as CPC. BS 88 Type NTT Time /Current Characteristics 2A to 20A & 20M32 BS 88 BS 88 Type T and NTT ft Characteristics 2A to A K factors K 1A.
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K factor bs 7671 correction factors are applicable to cables drawn into buried ducts; for cables laid direct in the ground the correction factors for thermal resistivities less than 2.
Where more precise values are required they may be calculated by methods given in the IEC series. The correction factors are applicable to ducts buried at depths of up to 0.
The neutral and the earthed parts are only connected together via an electrode system back to the source earth and neutral. To check that conventional systems are satisfactory, i.
This is quite a tedious process, involving as it does the calculation of the k factor bs 7671 afforded not only by the earth return but also by: The phase conductor Supply network Any neutral impedance.
This information must be requested early. The Electricity Distributor should be able to give the fault level or the equivalent impedance of the supply network and the manufacturer can provide the appropriate k factor bs 7671 for the transformer.
However, time will be required to obtain the answers so enquiries should be made at the commencement of the project.
The substation will house the circuit breakers of fuses for the main cable connections to the sub-distribution boards and motor control centres. These protective devices must discriminate with those further down the line nearer the ultimate loads.
A system study must therefore establish the correct ratings of the substation equipment to discriminate with the distribution network. Particularly useful for power engineers starting out on their career, this new edition ensures Bayliss remains an essential 'tool of the trade' for all engineers, technicians, managers and planners involved in electricity supply and industrial k factor bs 7671 usage.
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