Table of three phase current Permissable three phase cable loading at 5 % voltage drop Presentation: I = F(L) and I = F(P) cos ϕ = 0.82 A 350 300 I = F(P) mm2 240 Permissable fuse rating for fixed installation Technical information 250 225 185 200 150 150 125 100 80 60 50 40 20 10 L= P= 120 95 70 50 35 25 16 10 50 100 150 200 250 300 350 400 450 500 m 25 50 75 100 125 150 175 200 KW Example: A power of 70 kW is to be transmitted across a distance of L = 450 m. The funktion I = F(P) gives us 70 kW ≈ 130 A (mixed users). The function I = F provides the cable cross section of 95 mm2. (L) A length of 500 metres would already require a cable of 120 mm2 to ensure that the voltage loss and therefore also the power loss would be in an acceptable and economical range. Representation: I = F(L) shows that, for example, for 95 mm2 the permissable fuse of 200 A determines the load limit up to L = 300 m, i.e. UV < 5 %. From 300 mm2 the cross section can no longer be fully utilised. HUBER+SUHNER Wires and cables 71
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