Cable size and current carrying capacity

Cable size and current carrying capacity for XLPE insulated cable, non-armored, Twin or multicore cable is as below:-

Conductor operating temperature is 90 degree Celsius

Ambient temperature: 30 degree Celsius.

Cable size and current carrying capacity for XLPE insulated, Armored, Twin or multicore cable is as below:-

Conductor operating temperature is 90 degree Celsius

Ambient temperature: 30 degree Celsius. For air and 20 degree Celsius for ground for installations require to comply with BS: 7671

Correction factors:-

For Ambient temperature:

Ambient temperature in degree Celsius	Correction Factor
25	1.02
30	1.00
35	0.96
40	0.91
45	0.87
50	0.82
55	0.76
60	0.65
65	0.58
70	0.50
75	0.41
80

Ground Temperature

Ambient temperature in degree Celsius	Correction Factor
10	1.07
15	1.04
20	1.00
25	0.96
30	0.93
35	0.89
40	0.85
45	0.80
50	0.76
55	0.71
60	0.65
65	0.60
70	0.53
75	0.46
80	0.38

Soil Resistivity

Thermal resistivity Km/W	Rating factor for cables buried in Ducts	Rating factor for direct buried cables
0.5	1.28	1.88
0.8	1.20	1.62
1.0	1.18	1.50
1.5	1.10	1.28
2.0	1.05	1.12
2.5	1.00	1.00
3.0	0.96	0.90

For cable selection chart for motors visit:-
http://electrialstandards.blogspot.in/2015/10/cable-selection-chart-for-motors.html