18
All dimensions (mm) are nominal
steel perimeter trunking
technical information
n
Compartment options
n
Cable capacity
Full capacity mm² per compartment area
For each size of cable multiply the number to be installed by its own
common factor. Add together the results of these calculations for all
cable sizes. The resulting sum should be equal to or less than the
trunking capacity. It is recommended that each compartment should not
be filled over 45% of its full capacity
Common cable factors
If the cable is not shown in the table below then the factor (area) can be
calculated by :
Measuring diameter
Dividing diameter by 2 to give the radius
Area = 3·142 x radius x radius
e.g.
3·142 x 2 x 2 =12·6 mm²
Back box
Back box
Back box
Back box
without with without with without with without with
Trunking
Size
110 x 63
130 x 63
170 x 63
170A x 63
Compartment
A
6408 3348 7628 4568 10068 7008 10068 7 008
B
–
–
616 616 1260 1260 1260 1 260
C
4 607 2087 5217 2697 6437 3917 5217 2 697
D
1 801 1261 2411 1871 3631 3091 4851 4 311
E
1801 1261 2411 1871 3631 3091 2411 1 961
F
4 607 2087 5217 2697 6437 3917 7657 5 047
G
2806 826 2806 826 2806 826 2806 736
4 mm diameter
Cable factors : power
Conductor size
mm
2
Factor
Solid
1·5
8·0
Solid
2·5
11·9
Stranded
1·5
8·6
Stranded
2·5
12·6
Stranded
4·0
16·6
Stranded
6·0
21·2
Cable factors : data
Ø mm
Factor
5e. UTP
5·5
30·2
5e. STP
6·0
36·0
6 UTP
6·5
42·2
6 STP
7·0
49·0
