TECHNICAL TOPIC STUDENT MINIMISING …
10NAPIT0870 444 1392 444 1392 11STUDENTFor example, in Fig 1, a cable which is protected by aBS 3036 rewireable fuse is first grouped together withother cables, then it is totally surrounded by thermalinsulation for a distance of more than metres. Thenfinally it is run through an area with a high ambienttemperature. As the BS 3036 fuse affects the whole cablerun, Ctmust be applied. However, there is no need toapply the other three factors as the worst factor alone willbe sufficient. Let s take the grouping factor to be , thethermal insulation factor to be and the ambienttemperature factor as , as indicated in Fig 1.
10 NAPIT 0870 444 1392 www.napit.org.uk NAPIT 0870 444 1392 www.napit.org.uk 11 STUDENT For example, in Fig 1, a cable which is protected by a
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