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   Current Carrying Capacities And Voltage Drop

    

Conductor Operating Temperature : 90°C
Ambient Temperature : 30°C
Current-Carrying Capacities (Amp)

Current-Carrying Capacities (Amp)

Conductor
crosssectional
area		 Reference
Method
4 (enclosed
in conduit
in thermally
insulating wall etc)		 Reference
Method 3
(enclosed in
conduit on a wall
or in trunking
etc)		 Reference
Method 1
(clipped direct)		 Reference Method 11
(on a
perforated
cable tray, horizontal
or vertical)		 Reference Method 12 (free air)
Horizontal
flat spaced		 Vertical
flat
spaced		 Trefoil
  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.		 2 cables,
single phase
a.c. or
d.c. flat
and
touching		 3 or 4
cables,
3-phase
a.c. flat
and
touching
or trefoil		 2 cables,
single
-phase
a.c. or
d.c. or
flat and
touching		 3 or 4
cables,
3-phase
a.c. flat
and
touching
or trefoil		 2 cables,
single phase
a.c. or
d.c. or 3
cables
three
phase		 2 cables,
single phase
a.c.
or d.c. or
3 cables
three
phase		 3 cables,
trefoil
3-phase
phase a.c.

1

2

3

4

5

6

7

8

9

10

11

12

mm2

A

A

A

A

A

A

A

A

A

A

A

1.0

13

-

-

-

15

-

-

-

-

-

-

1.5

18

17

22

19

25

23

-

-

-

-

-

2.5

24

23

30

26

34

31

-

-

-

-

-

Voltage Drop (Per Amp Per Meter)

Nominal
Cross
Section
Area

2 cables
d.c.

 2 cables, single-phase a.c. 3 or 4 cables, 3-phase a.c.

Ref. Methods 3
and 4 (enclosed
in conduit etc,
in or on a wall)

Ref. Methods 1
and 11 (clipped
direct or on trays
touching)

Ref. Methods 3
and 4 (enclosed
in conduit etc,
in or on a wall)

 Ref. Methods 1,
Ref. Methods 1 and
11

11 and 12 (in
trefoil)

(Flat and touching)

1

2

3

4

5

6

7

mm2

mV/A/m

mV/A/m

mV/A/m

mV/A/m

mV/A/m

mV/A/m

1.0

46

46

-

-

-

-

1.5

31

31

27

27

27

27

2.5

19

19

16

16

16

16