Retningslinjer for valg av ledertverrsnitt for trefase- motorer avhengig av kabellengden.
Det forutsettes fast opplagt kabel i bygninger eller bevegelig ledning, med tillatt belastning etter FEB 91. Gjelder 230V.
Det er ved beregningen forutsatt et maksimalt spenningsfall på 3%. I de fleste tilfelle er det motstrømmen og tillatt sikringsstørrelse som avgjør valget av ledertverrsnittet.
| Motoreffekt | Kabellengde i meter | |||
| kW | HK | 30 | 50 | 100 |
| mm2 | mm2 | mm2 | ||
| 0,5 | 0,68 | 1,5 | 1,5 | 1,5 |
| 1,0 | 1,36 | 1,5 | 1,5 | 1,5 |
| 1,5 | 2,04 | 1,5 | 1,5 | 2,5 |
| 2,0 | 2,76 | 1,5 | 2,5 | 4,0 |
| 2,5 | 3,40 | 1,5 | 2,5 | 4,0 |
| 3,0 | 4,08 | 2,5 | 2,5 | 6,0 |
| 3,5 | 4,78 | 2,5 | 4,0 | 6,0 |
| 4,0 | 5,44 | 2,5 | 4,0 | 6,0 |
| 4,5 | 6,12 | 4,0 | 4,0 | 10,0 |
| 5,0 | 6,80 | 4,0 | 4,0 | 10,0 |
| 6,0 | 8,16 | 6,0 | 6,0 | 10,0 |
| 7,0 | 9,52 | 10,0 | 10,0 | 16,0 |
| 8,0 | 10,90 | 10,0 | 10,0 | 16,0 |
| 9,0 | 12,20 | 10,0 | 10,0 | 16,0 |
| 10,0 | 13,60 | 16,0 | 16,0 | 16,0 |
| 12,0 | 16,30 | 16,0 | 16,0 | 16,0 |
| 14,0 | 19,00 | 16,0 | 16,0 | 25,0 |
| 16,0 | 21,80 | 16,0 | 16,0 | 25,0 |
| 18,0 | 24,50 | 25,0 | 25,0 | 35,0 |
| 20,0 | 27,20 | 25,0 | 25,0 | 35,0 |
| 22,0 | 29,90 | 25,0 | 25,0 | 35,0 |
| 24,0 | 32,60 | 35,0 | 35,0 | 35,0 |
| 26,0 | 35,40 | 35,0 | 35,0 | 35,0 |
| 28,0 | 38,10 | 35,0 | 35,0 | 50,0 |
| 30,0 | 40,80 | 35,0 | 35,0 | 50,0 |
| 35,0 | 47,60 | 50,0 | 50,0 | 50,0 |
| 40,0 | 54,40 | 70,0 | 70,0 | 70,0 |
| 45,0 | 61,20 | 70,0 | 70,0 | 70,0 |
| 50,0 | 68,00 | 70,0 | 70,0 | 70,0 |
| 55,0 | 74,80 | 70,0 | 70,0 | 70,0 |
| 60,0 | 81,60 | 95,0 | 95,0 | 95,0 |
| 65,0 | 88,40 | 120,0 | 120,0 | 120,0 |
| 70,0 | 95,20 | 120,0 | 120,0 | 120,0 |
| 75,0 | 102,00 | 150,0 | 150,0 | 150,0 |
| 80,0 | 109,00 | 150,0 | 150,0 | 150,0 |
| 85,0 | 116,00 | 185,0 | 185,0 | 185,0 |
| 90,0 | 122,00 | 185,0 | 185,0 | 185,0 |
| 95,0 | 129,00 | 185,0 | 185,0 | 185,0 |
| 100,0 | 136,00 | 240,0 | 240,0 | 240,0 |
Informasjonen er opprinnelig hentet med bakgrunn fra Nexans Norway.
Forbehold: Alt ovenfor av standarder, retningslinjer mm. er gitt med basis av alminnelig kjente tekniske håndbøker, allmenn informasjon, og etter beste overbevisning og i god tro, og uten ansvar for mulige feil.