BS 7889:2012 pdf download – Electric cables – Thermosetting insulated, non-armoured cables with a voltage of 600/1 000 V, for fixed installations 3 Terms and definitions For the purposes of this British Standard, the terms and definitions given inIEC 60050-461 and the following apply. 3.1 cable manufacturer organization that has the capability to both produce and control the conformityof cable made to this British’Standard NOTE See 11.1a) for information on marking the cable with the cablemanufacturer’s name and identifier. 3.2 length of lay axial length of one complete turn of the helix formed by one cable component3.3routine tests,R tests made on all production cable lengths to demonstrate their integrity 3.4 sample tests,s tests made on samples of completed cable, or components taken from acompleted cable, adequate to verify that the product meets the designspecifications 3.5type tests,T tests made before supplying, on a general commercial basis, a type of cablecovered by this British Standard, in order to demonstrate satisfactory performance characteristics to meet the intended application NOTE These tests are of such a nature that after they have been made, they neednot be repeated unless changes are made in the cable materials, design or type ofmanufacturing process,which might change the performance characteristics. 3.6values 3.6.1approximate value value which is only indicative NOTE Values described as “approximate” do not constitute requirements to bechecked by measurement. 3.6.2nominal value value by which a quantity is designated NOTE Nominal values usually give rise to values to be checked by measurementstaking into account specified tolerances. 3.7voltages 3.7.1maximum voltage,um maximum sustained power-frequency voltage between phase conductors forwhich the cable is suitable 3.7.2rated voltage, uo nominal power-frequency voltage between conductor(s) and earth for which thecable is suitable 3.7.3rated voltage,U nominal power-frequency voltage between phase conductors for which thecable is suitable 4Rated voltage The cables shall be designated by the rated voltages u, and u, expressed in theform u,/u. The rated voltage recognized for the purposes of this standard shall be600/1 00o v. The maximum designated voltage(u.) for the purposes of this standard for600/1 00o v cable shall be 1 200 v. In an alternating current system, the rated voltage of the cable shall be at leastequal to the nominal voltage of the system for which it is intended. NOTEGuidance on the selection of cables of appropriate voltage designations forparticular systems is given in A.4. 5 Conductors The conductors shall be annealed copper as given in Table 2 to Table...
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