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Cable: Current Carrying Capacity Charts | SWA Cables

Table 4E4A – Current Carrying Capacity in Ampere

Current Rating Chart for Multicore Armoured
Thermoplastic Insulated Cables with Copper
Conductors at 90°C Operating Temperature

Extract from the IEE Wiring Regulations, 17th Edition
30°C Ambient Air Temperature,
90°C Conductor Operating Temperature,
20°C Ambient Ground Temperature

Conductor cross-sectional area mm²REFERENCE METHOD C - CLIPPED DIRECTMethod D - Direct or in ducts, in ground, in/around buildings.Method E - In free air or on a perforated cable tray.
1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 three-core* or 1 four-core
phase A.C or D.C.cable, three-phase A.C.phase A.C or D.C.cable, three-phase A.C.phase A.C or D.C.cable, three-phase A.C.
1.5272325212925
2.5363133283933
4494243365244
6625353446656
10857371589078
1611094917511599
2514612411696152131
35180154139115188162
50219187164135228197
70279238203167291251
95338289239197354304
120392335271223410353
150451386306251472406
185515441343281539463
240607520395324636546
300698599446365732628
400787673847728

Table 4E4B – Voltage drop per ampere, per metre 70°C conductor operating temperature

Conductor crosssectional
area mm²
Two-core
cable, D.C.
Two-core cable,
single phase A.C.
Three or four-core cable,
three-phase A.C.
mV/A/mmV/A/mmV/A/m
1.5313127
2.5191916
4121210
67.97.96.8
104.74.74.0
162.92.92.5
rxzrxz
251.8501.8500.1601.9001.6000.1401.650
351.3501.3650.1551.3651.1500.1351.150
500.9800.9900.1551.0000.8600.1350.870
700.6700.6700.1500.6900.5900.1300.600
950.4900.5000.1500.5200.4730.1300.450
1200.3900.4000.1450.4200.3400.1300.380
1500.3100.3200.1450.3500.2800.1250.300
1850.2500.2600.1450.2900.2200.1250.260
2400.1950.2000.1400.2400.1750.1250.210
3000.1550.1600.1400.2100.1400.1200.185
4000.1200.1300.1400.1900.1150.1200.165

DISCLAIMER: The infomation on this page and the pdf is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.

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