Airport Cable  
 

 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