Circuit type * Select circuit type Radial final circuit Ring final circuit (UK standard arrangement)
Supply phase Select phase Single phase Three phase
Supply voltage Select voltage 230 V 400 V
Design current Ib (A) *
Circuit length (m) * One-way length for a radial.
Protective-device type * Select protective-device type MCB Type B MCB Type C MCB Type D BS 3036 rewirable fuse
Protective-device rating In (A) * Select In (A) 2 A 4 A 6 A 10 A 13 A 16 A 20 A 25 A 32 A 40 A 50 A 63 A Available ratings are administrator-controlled.
Installation / reference method * Select method Method A Method B Method C Method D Method E Method F
Temperature correction (Ca) * Select Ca 25 C — 1.030 30 C — 1.000 35 C — 0.940 40 C — 0.870 45 C — 0.790 50 C — 0.710 55 C — 0.610 60 C — 0.500
Grouping factor (Cg) * Select grouping (1–6 circuits) 1 circuit — 1.000 2 circuits — 0.800 3 circuits — 0.700 4 circuits — 0.650 5 circuits — 0.600 6 circuits — 0.570
Thermal insulation (Ci) * Select Ci No thermal insulation — 1.000 Fully surrounded > 0.5 m — 0.500 50 mm surrounded — 0.880 100 mm surrounded — 0.780 200 mm surrounded — 0.630 400 mm surrounded — 0.510
Protective-device correction (Cc) * Select Cc Normal protective device / above ground — 1.000 BS 3036 rewirable fuse — 0.725 Buried / duct in ground — 0.900
Voltage-drop design criterion * Select limit 1 % 2 % 3 % 5 %
Cable selection Automatic — smallest cable passing all selected criteria Select phase and installation method to show the applicable cable sizes.