Current ratings for HO7-RNF for current supply in industrial application

operating temperature at conductor 60C ambient temperature 30C air .

Number of cores 1 core 2 cores 3 cores 3 cores 4 cores 5 cores
Number of loaded cores 2 cores
loaded		 3 cores
1oaded		 2 cores
loaded		 2 cores
loaded		 3 cores
loaded		 3 cores
loaded		 3 cores
loaded
Cross section mm2
Current ratings in ampere(A)
4.0 34 30 34 35 29 30 30
6.0 43 38 43 44 36 37 38
10.0 60 53 60 62 51 52 54
16.0 79 71 79 82 67 69 71
25.0 104 94 105 109 89 92 94
35.0 129 117 135 110 114
50.0 162 148 169 138 143
70.0 202 185 211 172 178
95.0 240 222 250 204 210
120.0 280 260 292 238 246
150.0 321 300 335 273 282
185.0 363 341 378 309 319
240.0 433 407 447 365 377
300.0 497 468 509 415 430
40.0 586 553
500.0 670 634
630.0 784 742

For the method of installation

Single core cables are bunched (unit form). 2 cores cables laid parallel with contact .3 cores cables are in triangle-form

 

Conversion factors for deviating ambient temperature 

Ambient temperatureat air 30C 30 35 40 45 50 55
Factor 1.0 0.91 0.82 0.71 0.58 0.41

 

HO7RN-F: voltage drop (per ampere per meter)

 

Conductor Size(mm) 1 Two Core or 2 Single Core Cables DC(mV/A/m) Two Core Cable
Single Phase AC
(mV/A/m) 		1 Three Core, Four Core or Five Core Cable
Single Phase AC
(mV/A/m) 		2 Single Core Cables Touching
Single Phase AC*
mV/A/m
1.0 - - - -
1.5 30.6 30.6 26.5 26.50
2.5 19.0 19.0 16.4 16.40
4.0 13.0 13.0 11.0 10.20
6.0 8.4 8.4 7.3 6.75
10.0 5.0 5.0 4.3 4.00
16.0 3.1 3.1 2.7 2.52
r x z r x z r x z
25.0 2.000 2.00 0.175 2.00 1.700 0.150 1.700 - - -
35.0 1.420 - - - 1.200 0.150 1.200 1.420 0.210 1.430
50.0 0.990 - - - 0.900 0.145 0.910 0.990 0.210 1.010
70.0 0.700 - - - 0.610 0.140 0.630 0.700 0.200 0.720
95.0 0.530 - - - 0.460 0.135 0.480 0.530 0.195 0.560
120.0 0.410 - - - 0.360 0.135 0.390 0.410 0.190 0.460
150.0 0.330 - - - 0.290 0.130 0.320 0.330 0.190 0.380
185.0 0.270 - - - 0.240 0.130 0.270 0.270 0.190 0.330
240.0 0.210 - - - 0.185 0.130 0.220 0.210 0.185 0.280
300.0 0.165 - - - 0.145 0.125 0.195 0.170 0.180 0.250
400.0 0.125 - - - - - - 0.130 0.175 0.220
630.0 0.073 - - - - - - 0.084 0.170 0.190

Conductor operating temperature: 85oc

 

1.        The voltage drop figures given above are based on a conductor operating temperature of 85oc and are therefore not accurate when the operating temperature is in excess of 85oc

 

2.        * A larger voltage drop will result if the cables are spaced

 

The above table is in accordance with Table 4H2B of the 16th Edition of IEE Wiring Regulations

 

For cables having conductors of 16mm or less cross-sectional area their inductance can be ignored and (mV/A/m)r values only tabulated. For cables having conductors greater than 16mm the impedence values are given as (mV/A/m)z, together with the resistive component (mV/A/m)r and the reactive component (mV/A/m)x.

 

The above paragraph is extracted from Appendix 4 of the 16th Edition of IEE Wiring Regulations