638*tq crrent ratings

 

TECHNICAL SPECIFICATIONS FOR 6381TQ

Single core, EPR insulated. HOFR sheathed. BS6007 6381TQ

Ambient temperature (deg c)
25

30

35

40

45

50

55

60

65

70

75

80
Rating factor
1.02

1.0

0.95

0.90

0.85

0.80

0.74

0.67

0.60

0.52

0.43

0.30

For ambient temperatures other than 30 deg c, the above factors should be applied

Ambient temperature: 30 deg c

Conductor operating temperature: 85 deg c

Note: ratings do not apply if a semi-enclosed fuse to BS3036 protects the cable

Current Carrying Capacity (Amperes)

Conductor cross sectional area (mm)
Enclosed in conduit etc in or on a wall

Clipped direct (horizontal or vertical)

On a perforated cable tray

Free air
  2 cables single phase a.c. or d.c.
(amp)
3 or 4 cables
3 phase a.c.
(amp)
2 cables single phase a.c. or d.c.
flat & touching
(amp)
3 or 4 cables
3 phase a.c.
flat & touching or trefoil
(amp)
2 cables single phase a.c. or d.c.
flat & touching
(amp)
3 or 4 cables
flat & touching or trefoil
(amp)
Single phase a.c. or d.c.
3 or 4 cables
3 phase a.c.
flat spaced horizontal or vertical
(amp)
3 cables
trefoil
3 phase a.c.
(amp)
4.0 40 36 45 42 - - - -
6.0 52 46 59 54 - - - -
10.0 72 63 81 75 - - - -
16.0 96 85 108 100 - - - -
25.0 127 112 143 133 153 140 154 134
35.0 157 138 177 164 189 174 192 167
50.0 190 167 215 199 229 211 235 204
70.0 242 213 274 254 293 269 303 262
95.0 293 258 332 308 356 327 370 320
120.0 339 298 384 357 412 379 431 373
150.0 372 334 442 411 475 437 499 432
185.0 428 379 519 469 542 499 573 495
240.0 510 443 607 553 639 589 679 587
300.0 593 506 695 636 735 679 786 680
400.0 710 602 827 755 860 798 929 799
500.0 835 689 946 865 989 918 1081 919
630.0 975 791 1088 996 1143 1162 1263 1060

6381TQ: 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
10.0 5.10 5.10 4.40 -
16.0 3.20 3.20 2.70 -
r x z r x z r x z
25.0 2.030 2.03 0.175 2.04 1.730 0.150 1.730 - - -
35.0 1.420 - - - 1.220 0.150 1.230 1.440 0.210 1.460
50.0 1.00 - - - 0.910 0.145 0.930 1.000 0.210 1.020
70.0 0.710 - - - 0.620 0.140 0.640 0.710 0.200 0.730
95.0 0.540 - - - 0.470 0.135 0.490 0.540 0.195 0.570
120.0 0.420 - - - 0.370 0.135 0.390 0.420 0.190 0.460
150.0 0.340 - - - 0.290 0.130 0.320 0.340 0.190 0.390
185.0 0.270 - - - 0.240 0.130 0.270 0.270 0.190 0.330
240.0 0.210 - - - 0.188 0.130 0.230 0.210 0.185 0.280
300.0 0.167 - - - 0.147 0.125 0.195 0.173 0.180 0.250
400.0 0.127 - - - - - - 0.132 0.175 0.200
500.0 0.100 - - - - - - 0.107 0.170 0.200
630.0 0.074 - - - - - - 0.085 0.170 0.190

Conductor operating temperature: 90oc

 

1.        The voltage drop figures given above are based on a conductor operating temperature of 90oc and are therefore not accurate when the operating temperature is in excess of 90oc. The case of the 180oc cables with a conductor temperature of 150oc the above resistive values should be increased by a factor of 1.2.

 

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

 

The above table is in accordance with Table 4F2B of the 17th 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 are 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 17th Edition of IEE Wiring Regulations