Current Ratings for Continuous Service (IEC 60092-352)

Current Ratings for Continuous Service (IEC 60092-352)

Conductor temperature	90℃
Nominal cross- sectional Area (mm²)	Single core ( A )		Two core ( A )		Three core & four core ( A )
0.5	10		8.5		7
0.75	13		11		9
1	18		15		13
1.5	23		20		16
2.5	30		26		21
4	40		34		28
6	52		44		36
10	72		61		50
16	96		82		67
25	127		108		89
35	157		133		110
50	196		167		137
70	242		206		169
95	293		249		205
120	339		288		237
150	389		331		273
185	444		377		311
240	522		444		366
300	601		511		420
	d.c.	a.c.	d.c.	a.c.	d.c.	a.c.
400	690	670	587	570	483	469
500	780	720	663	612	546	504
500	890	780	757	663	623	546

Note

Maximum permissible service temperature of the conductor is 90℃.
The current ratings given above are based on an ambient air temperature of 45℃.
The current ratings given above are for 6 cables of less bunched or laid together in flat formation. When more than 6 cables are bunched or laid close together, the current ratings

given above should be multiplied by correction factor 0.85.

For cables with more than four core cables, the current ratings are calculated by the following formula.

I=I1/N1/3

I1: Current for single core cable

N: Number of cores

Maximum

conductor temperature

Correction factors for ambient air temperature

℃

1.10

1.05

1.00

0.94

0.88

0.82

0.74

0.67

0.58

0.47