Conductor | Bunched & Enclosed in Conduit or Trunking | Clipped Direct to a Surface or on a Cable TrayBunched or Unenclosed | |||||||
---|---|---|---|---|---|---|---|---|---|
Nominal Cross-Sectional Area | No. and Diameter of Wires | 2 Cables Single-Phase A.C. or D.C. | 3 or 4 Cables, Three-Phase A.C. | 2 Cables Single-Phase A.C. or D.C. | 3 or 4 Cables, Three-Phase A.C. | ||||
Current Rating | Volt Drop per amp. per metre* | Current Rating | Volt Drop per amp. per metre* | Current Rating | Volt Drop per amp. per metre* | Current Rating | Volt Drop per amp. per metre* | ||
mm2 | mm | A | mV | A | mV | A | mV | A | mV |
1.0 1.5 2.5 4 6 10 16 25 35
50 70 95 120 150 185 240 300 400 500 630 |
1/1.13 1/1.38 1/1.78 7/0.85 7/1.04 7/1.35 7/1.70 7/2.14 19/1.53
19/1.78 19/2.14 19/2.52 37/2.03 37/2.25 37/2.52 61/2.25 61/2.25 61/2.85 61/3.20 127/2.52 |
11 13 18 24 31 42 56 73 90
145 185 230 260 - - - - - - - |
40 27 16 10 608 4.0 2.6 1.6 1.2 A.C. D.C. 0.97 0.91 0.71 0.63 0.56 0.45 0.48 0.36 - - - - - - - - - - - - - - |
9 11 16 22 28 39 50 66 80
125 160 195 220 - - - - - - - |
35 23 14 8.8 5.9 3.5 2.2 1.4 1.0
0.84 0.62 0.48 0.42 - - - - - - - |
13 16 23 30 38 51 68 89 109
175 220 270 310 355 405 480 560 680 800 910 |
40 27 16 10 6.8 4.0 2.6 1.6 1.2 A.C. D.C. 0.93 0.91 0.65 0.63 0.48 0.45 0.40 0.36 0.34 0.29 0.29 0.24 0.24 0.18 0.22 0.14 0.20 0.12 0.18 0.086 0.17 0.068 |
12 15 20 27 34 46 61 80 98
160 200 240 280 320 365 430 500 610 710 820 |
35 23 14 8.8 5.9 3.5 2.2 1.4 1.0
0.82 0.59 0.45 0.38 0.34 0.30 0.27 0.25 0.24 0.23 0.22 |
Conductor | Enclosed in Conduit or Trunking | Clipped Direct to a Surface or on a Cable Tray Unenclosed | |||||||
---|---|---|---|---|---|---|---|---|---|
Nominal Cross-Sectional Area | No. and Diameter of Wires | One Twin Cable with or Without Earth continuity Conductor, Single-Phase A.C. or D.C. | One Three-Core Cable, with or without earth continuity conductor, or one 4-core, 3-phase | One Twin Cable with or Without Earth continuity Conductor, Single-Phase A.C. or D.C. | One Three-Core Cable, with or without earth continuity conductor, or one 4-core, 3-phase | ||||
Current Rating | Volt Drop per amp. per metre* | Current Rating | Volt Drop per amp. per metre* | Current Rating | Volt Drop per amp. per metre* | Current Rating | Volt Drop per amp. per metre* | ||
mm2 | mm | A | mV | A | mV | A | mV | A | mV |
1.0 + 1.5 + 2.5 + 4 + 6 + 10 + 16 + 25 ++ 35 ++ |
1/1.13 1/1.38 1/1.78 7/0.85 7/1.04 7/1.35 7/1.70 7/2.14 19/1.53 |
11 13 18 24 30 40 53 60 74 |
40 27 16 10 6.8 4.0 2.6 1.7 1.2 |
9 12 16 22 27 37 47 53 65 |
35 23 14 8.8 5.9 3.5 2.2 1.5 1.0 |
12 15 21 27 35 48 64 71 87 |
40 27 16 10 6.8 4.0 2.6 1.7 1.2 |
10 13 18 24 30 41 54 62 72 |
35 23 14 8.8 5.9 3.5 2.2 1.5 1.0 |
Note:
+ Flat Cable Only.
++ Circular Cable
* The colt drops between the consumer’s terminals and any other point the
installation must not exceed
2.5% of the nominal voltage.
Nominal cross-sectional aera of conductor | No. and diameter of wire | Clipped direct to a surface or on a cable tray and unenclosed | ||||
---|---|---|---|---|---|---|
One twin cable, single phase ac or dc | One 3 or 4-core cable 3-phase | |||||
Current Rating | Volt Drop per amp per metre* | Current Rating | Volt Drop per amp per metre* | |||
ac | dc | |||||
mm2 | mm | A | mV | mV | A | mV |
50 70 95 120 150 185 240 300 |
19/1.78 19/2.14 19/2.52 37/2.03 37/2.25 37/2.52 61/2.25 61/2.52 |
140 175 215 250 285 325 385 445 |
0.94 0.66 0.49 0.40 0.33 0.28 0.24 0.21 |
0.93 0.64 0.46 0.37 0.30 0.24 0.19 0.15 |
125 155 190 215 250 280 335 390 |
0.81 0.57 0.42 0.34 0.29 0.24 0.20 0.18 |
Conductor Nominal Cross-Sectional Area | Bunched and Enclosed in Conduit Trunking | Clipped direct to a surface or on cable tray and unenclosed | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
2 Cables, Single-Phase A.C. or D.C. | 3 or 4 Cables 3-Phase A.C. | 2 Cables, Single-Phase A.C. or D.C. | 3 or 4 Cables 3-Phase A.C. | |||||||
Current Rating | Volt Drop Per Amp. Per Metre* | Current Rating | Volt Drop Per Amp. Per Metre* | Current Rating | Volt Drop Per Amp. Per Metre* | Current Rating | Volt Drop Per Amp. Per Metre* | |||
A.C | D.C | |||||||||
mm2 | A | mV | mV | A | mV | A | mV | mV | A | mV |
16 25 35 50 70 95 120 150 185 240 300 400 500 630 |
60 78 96 120 150 175 205 235 -* - - - - - |
4.5 2.9 2.1 1.6 1.2 0.93 0.80 0.73 - - - - - - |
4.5 2.8 2.0 1.5 1.0 0.75 0.60 0.49 - - - - - - |
52 67 83 100 125 150 175 200 - - - - - - |
3.9 2.5 1.8 1.4 1.0 0.80 0.70 0.64 - - - - - - |
72 94 115 140 175 210 240 275 320 380 440 530 620 720 |
4.5 2.8 2.1 1.5 1.1 0.77 0.62 0.51 0.42 0.34 0.29 0.25 0.22 0.20 |
4.5 2.8 2.0 1.5 1.0 0.75 0.60 0.49 0.39 0.29 0.23 0.18 0.15 0.11 |
65 85 105 125 155 185 215 245 285 340 390 475 550 640 |
3.9 2.5 1.8 1.3 0.93 0.69 0.56 0.48 0.40 0.34 0.30 0.27 0.25 0.24 |
* The Volt drop between consumer’s terminals and any other point in the installation must not exceed 2.5% of the nominal voltage.
Conductor Nominal Cross-Sectional Area | Enclosed in Conduit Trunking | Clipped direct to a surface or on cable tray, Unenclosed | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
One Twin Cable Single-Phase A.C or D.C | One 3 or 4-Core Cables 3-Phase AC | One Twin Cable Single-Phase A.C or D.C | One 3 or 4-Core Cables 3-Phase AC | |||||||
Current Rating | Volt Drop Per Amp. Per Metre* | Current Rating | Volt Drop Per Amp. Per Metre* | Current Rating | Volt Drop Per Amp. Per Metre* | Current Rating | Volt Drop Per Amp. Per Metre* | |||
A.C | D.C | |||||||||
mm2 | A | mV | mV | A | mV | A | mV | mV | A | mV |
16 25 35 50 70 95 120 150 185 240 300 |
49 64 79 99 - - - - - - - |
4.6 2.9 2.2 1.7 - - - - - - - |
4.6 2.9 2.1 1.5 - - - - - - - |
43 57 70 87 - - - - - - - |
4.0 2.9 2.1 1.5 - - - - - - - |
58 76 92 115 140 165 195 220 250 300 340 |
4.6 2.9 2.1 1.6 1.1 0.79 0.63 0.52 0.43 0.34 0.29 |
4.6 2.9 2.1 1.5 1.1 0.77 0.61 0.50 0.40 0.31 0.25 |
52 67 82 100 120 150 170 195 220 260 300 |
4.0 2.5 1.8 1.3 0.93 0.63 0.54 0.45 0.37 0.30 0.25 |
The rating tabulated apply only where the cables has coarse excess-current protection For close excess-current protection, the tabulated ratings must be multiplied by 1.33
Conductor | Clipped Direct to a Surface or on aCable Tray, and Unenclosed | Defined Conditions | |||||||
---|---|---|---|---|---|---|---|---|---|
Nominal Area | Construction | One Twin Cable, Single-Phase A.C. or D.C. | One Three or Four-Core Cable, Three-Phase | One Twin Cable, Single-Phase A.C. or D.C. | One Three or Four-Core Cable, Three-Phase | ||||
Current Rating | Volt Drop per Amp. Per meter* | Current Rating | Volt Drop per Amp. Per meter* | Current Rating | Volt Drop per Amp. Per meter* | Current Rating | Volt Drop per Amp. Per meter* | ||
mm2 | mm | A | mV | A | mV | A | mV | A | mV |
1.5 2.5 4 6 10 16 25 35 |
1/1.38 3/1.04 7/0.85 7/1.04 7/1.35 7/1.70 7/2.14 19/1.53 |
14 20 26 32 45 58 76 93 |
28 17 11 7.0 4.1 2.6 1.7 1.2 |
13 17 22 28 38 50 66 80 |
24 15 9.1 6.0 3.6 2.2 1.5 1.0 |
- - - 38 52 68 91 112 |
- - - 7.0 4.1 2.6 1.7 1.2 |
- - - 32 44 58 77 94 |
- - - 6.0 3.6 2.2 1.5 1.0 |
The rating tabulated apply only where the cables has close excess-current protection
For Coarse excess-current protection, the tabulated ratings must be multiplied by 1.75
Conductor | Clipped Direct to a Surface or on a Cable Tray, and Unenclosed | Defined Conditions | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Nominal Area | Construction | One Twin Cable, Single-Phase A.C. or D.C. | One Three or Four-Core Cable, Three-Phase | One Twin Cable, Single-Phase A.C. or D.C. | One Three or Four-Core Cable, Three-Phase | ||||||
Current Rating | Volt Drop per Amp. Per meter* | Current Rating | Volt Drop per Amp. Per meter* | Current Rating | Volt Drop per Amp. Per meter* | Current Rating | Volt Drop per Amp. Per meter* | ||||
A.C. | D.C. | A.C. | D.C. | ||||||||
mm2 | mm | amp | mV | mV | amp | mV | amp | mV | mV | amp | mV |
50 70 95 120 150 185 240 300 400 |
19/1.78 19/2.14 19/2.52 37/2.03 37/2.25 37/2.52 61/2.25 61/2.52 61/2.85 |
150 180 225 260 290 340 400 460 520 |
0.92 0.65 0.48 0.40 0.32 0.29 0.25 0.23 0.22 |
0.92 0.64 0.46 0.36 0.25 0.23 0.18 0.14 0.11 |
125 155 190 220 250 290 350 400 460 |
0.81 0.57 0.42 0.34 0.29 0.24 0.20 0.18 0.17 |
180 220 270 310 355 410 485 550 620 |
0.92 0.65 0.48 0.40 0.32 0.29 0.25 0.23 0.22 |
0.92 0.64 0.46 0.36 0.25 0.23 0.18 0.14 0.11 |
155 190 230 270 310 350 420 475 550 |
0.81 0.57 0.42 0.34 0.29 0.24 0.20 0.18 0.17 |
* The Volt Drop between consumer's terminals and other point in insulation must not exceed 2.5% of the nominal voltage.