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690
FLOOR SYSTEMS
SCREEDED
Cablelink Plus Screed
Technical
TOP TIPS
l
The number and location of boxes will depend on the end user
requirements
l
If the furniture layout is available, a floor box should be considered
for each workstation or desk
l
If the final furniture layout is not available as a general guide the
minimum recommended distribution is one floor box for every
10m², and the maximum being one floor box per 4m²
Cablelink Plus Screed System
Cable Capacity Guide
The cable factor table below is based on the 17th Edition of the
IET Wiring Regulation (BS 7671) and must be regarded only as
a guideline. Care should be taken in selecting adequate trunking
sections taking into consideration the number and size of cables
involved and construction of the junction box. It is recommended
that the initial design of trunking installations include adequate
provision for future wiring. To determine the size of the trunking
required, multiply the quantities of each size of conductor and
appropriate factor from Table A and compare the total with the
capacity unit figure in the appropriate Table B.
TABLE A – CABLE FACTORS
CABLE TYPE
CSA
CABLE FACTOR
POWER CABLES
PVC Stranded
1.5mm²
8.6
2.5mm²
12.6
4mm²
16.6
6mm²
21.2
10mm²
35.3
16mm²
47.8
25mm²
73.9
Twin & Earth
2.5mm²
86
4mm²
99
6mm²
148
DATA CABLES
Cat 5E UTP
5.5mm dia
30.2
Cat 5E STP
6.0mm dia
36
Cat 6 UTP
6.5mm dia
42.2
Cat 6 STP
7.0mm dia
49
Cat 6A
8.0mm dia
64
Sample calculation
To estimate the total number of cables that can be accommodated
with a 100 x 38mm ducting:
Step 1
Pick the factor from Table B corresponding to
100 x 38 = 1563
Step 2
Select the size of the cable that needs to be pulled
through the trunking and its corresponding factor from
Table A e.g. 4mm
2
stranded = 16.6
Step 3
No. of cables = Value from (Table B / Table A)
e.g. 1563/16.6 = 94 Cables.
TABLE B – METAL SCREED DUCTING CABLING CAPACITY
SIZE
(MM)
COMPARTMENT
SIZE
CAPACITY
100%
CAPACITY
(45% FILL)
100 x 38
100 x 38 (1 comp)
3474
1563
225 x 38
112 x 25 (2 comp)
75 x 38 (3 comp)
3940
2613
1773
1176
250 x 38
13 x 38 (3 comp)
2909
1309
275 x 38
91 x 38 (3 comp)
3206
1443
300 x 38
100 x 38 (1 comp)
3503
1576
Cablelink Plus Screed System ducting complies with
BS EN 50085-1:2005 and BS EN 50085-2-2:2008.
The above table gives the available capacity units on 45% factor,
applied to the internal wiring area.
Carpet Cut out Dimensions
A
B
A
B
C
D
14
14
The table below shows the sizes required for the carpet lid infill
and carpet tile cut out for the Cablelink Plus Screed Floorboxes.
LID LIST
NUMBER
CARPET LID INFILL
DIMENSIONS
(mm)
A
B
CXL100
152
93
CXL265
219
251
CXL340
219
326
CUJL200
188
188
CUJL265
253
253
CUJL240
328
328
DUCTING CABLE CAPACITY – DATA CABLES
DUCTING
CAPACITY mm²
60MM DUCTING
90MM DUCTING
1025
2300
NOMINAL CABLE
DIAMETER mm²
NUMBER OF CABLES
60mm DUCTING
90mm DUCTING
@50% @75% @50% @75%
5.5
17
25
38
57
6
14
21
32
48
6.5
12
18
27
41
7
10
15
23
35
8
8
12
17
26
BASE LIST
NUMBER
BOX CARPET CUT
OUT DIMENSIONS
(mm)
C
D
CUB100
100
100
CUB265
265
265
CUB340
340
340
CUJ200
200
200
CUJ265
265
265
CUJ240
340
340