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Electric Cable Size vs. Current Rating

Amps vs. cable size for fixed installations in buildings.

The table below indicates current ratings for fixed cable installations within buildings. The table is based on PVC-wiring and PVC-insulated cables - single wire, fine wires and multi stranded wires.

Electric Cables - Current Ratings
Installation MethodA1A2B1B2
InstallationSingle core cables, in insulating tubes, in thermally insulated wallsMulti core sheathed cables, in insulating tubes, in thermally insulated wallsSingle core cables, in insulating tubes, on wallsMulti core cables, or multi core sheathed cables, in insulating tubes, on walls

Number of Cores

23232323
Cross-Section
(mm2)
Current Ratings
(ampere)
1.5 15.5 13.5 15.5 13.0 17.5 15.5 16.5 15.0
2.5 19.5 18.0 18.5 17.5 24 21 23 20
4 26 24 25 23 32 28 30 27
6 34 31 32 29 41 36 38 34
10 46 42 43 39 57 50 52 46
16 61 56 57 52 76 68 69 62
25 80 73 75 68 101 89 90 80
35 99 89 92 83 125 110 111 99
50 119 108 110 99 151 134 133 118
70 151 136 139 125 192 171 168 149
95 182 164 167 150 232 207 201 179
120 210 188 192 172 269 239 232 206
150 240 216 219 196
185 273 245 248 223
240 320 286 291 261
300 367 328 334 298
  • operating temperature max. 70 oC
  • ambient temperature max. 70 oC
  • A1 - Single core cables in a conduit in a thermally insulated wall
  • A2 - Multi core cable or multi-core sheathed cable in a conduit in a thermally insulated wall
  • B1 - Single core cables in conduit or wall
  • B2 - Multi core cable or multi-core sheathed cable in a conduit in a wall

Related Topics

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    Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.

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