Page 446 - Acel Catalogue 2021-22
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446
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Useful Information - Current Carrying Capacity
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VOLTAGE DROP (per ampere per metre)
Conductor Cross Sectional Area
2 cables, single-phase a.c.
Reference Methods C&F (clipped direct, on tray, or in free air)
3 or 4 cables, three-phase a.c.
2 cables d.c.
Reference Methods A&B (enclosed in trunking)
Reference Methods C&F (clipped direct, on tray or in free air)
Cables touching, Cables touching, Cables spaced*, trefoil flat flat
Cables touching Cables spaced* 123456789
(mm2) (mV/A/m)
1 44 1.5 29 2.5 18
(mV/A/m) (mV/A/m)
44 44 29 29 18 18 11 11
(mV/A/m) (mV/A/m) (mV/A/m) (mV/A/m) (mV/A/m)
44 38 38 38 38 29 25 25 25 25 18 15 15 15 15 11 9.5 9.5 9.5 9.5
4 11
6 7.3 7.3
7.3 7.3 6.4 4.4 4.4 3.8 2.8 2.8 2.4
6.4 6.4 6.4 3.8 3.8 3.8 2.4 2.4 2.4
10 4.4 4.4 16 2.8 2.8
rxzrxzrxzrxzrxzrxzrxz 25 1.75 1.8 0.33 1.8 1.75 0.2 1.75 1.75 0.29 1.8 1.5 0.29 1.55 1.5 0.175 1.5 1.5 0.25 1.55 1.5 0.32 1.55 35 1.25 1.3 0.31 1.3 1.25 0.195 1.25 1.25 0.28 1.3 1.1 0.27 1.1 1.1 0.17 1.1 1.1 0.24 1.1 1.1 0.32 1.15 50 0.93 0.95 0.3 1 0.93 0.19 0.95 0.93 0.28 0.97 0.81 0.26 0.85 0.8 0.165 0.82 0.8 0.24 0.84 0.8 0.32 0.86 70 0.63 0.65 0.29 0.72 0.63 0.185 0.66 0.63 0.27 0.69 0.56 0.25 0.61 0.55 0.16 0.57 0.55 0.24 0.6 0.55 0.31 0.51 95 0.46 0.49 0.28 0.56 0.47 0.18 0.5 0.47 0.27 0.54 0.42 0.24 0.48 0.41 0.155 0.43 0.41 0.23 0.47 0.4 0.31 0.51
120 0.36 0.39 0.27 0.47 0.37 0.175 0.41 0.37 0.26 0.45 0.33 0.23 0.41 0.32 0.15 0.36 0.32 0.23 0.4 0.32 0.3 0.44 150 0.29 0.31 0.27 0.41 0.3 0.175 0.34 0.29 0.26 0.39 0.27 0.23 0.36 0.26 0.15 0.3 0.26 0.23 0.34 0.26 0.3 0.4 185 0.23 0.25 0.27 0.37 0.24 0.17 0.29 0.24 0.26 0.35 0.22 0.23 0.32 0.21 0.145 0.26 0.21 0.22 0.31 0.21 0.3 0.36 240 0.18 0.195 0.26 0.33 0.195 0.165 0.25 0.185 0.25 0.31 0.17 0.23 0.29 0.16 0.145 0.22 0.16 0.22 0.27 0.16 0.29 0.34 300 0.145 0.16 0.26 0.31 0.15 0.165 0.22 0.15 0.25 0.29 0.14 0.23 0.27 0.13 0.14 0.19 0.13 0.22 0.25 0.13 0.29 0.32 400 0.105 0.13 0.26 0.29 0.12 0.16 0.2 0.115 0.25 0.27 0.12 0.22 0.25 0.105 0.14 0.175 0.105 0.21 0.24 0.1 0.29 0.31 500 0.086 0.11 0.26 0.27 0.098 0.155 0.185 0.093 0.24 0.26 0.1 0.22 0.25 0.086 0.135 0.16 0.086 0.21 0.23 0.081 0.29 0.3 630 0.068 0.094 0.25 0.27 0.081 0.155 0.175 0.076 0.24 0.25 0.08 0.22 0.24 0.072 0.135 0.15 0.072 0.21 0.22 0.066 0.28 0.29 800 0.053 - 0.068 0.15 0.165 0.061 0.24 0.25 - 0.06 0.13 0.145 0.06 0.21 0.22 0.053 0.28 0.29 1000 0.042 - 0.059 0.15 0.16 0.05 0.24 0.24 - 0.052 0.13 0.14 0.052 0.2 0.21 0.044 0.28 0.28
NOTE: *Spacings larger than one cable diameter will result in a larger voltage drop.
DISCLAIMER: This information has been supplied in good faith and the upmost care has been taken to ensure the data is accurate in its derivation from BS 7671.
However, this information should not be considered as a substitute for BS 7671, which should always be referred to. It remains the responsibility of the user to ensure all data and assumptions are correct and that any cable used is suitable for its intended purpose.
WARNING
Current ratings are dependent on the type of installation and those shown are for guidance only.
For precise cable ratings for a particular installation refer to the current edition of the IEE Wiring Regulations.
Section 11 - Useful Information & Index
Section 11 - Useful Information & Index
