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B-22
Distribution
Busbar calculation
The bars are secured by insulated supports. Three
fixed supports, attached to the framework, are
mandatory.
If necessary, additional free supports may be used.
Mounting chocks screwed to the busbars rest on one of
the fixed supports.
The table opposite indicates:
b
the number and size of the bars to be used,
depending on the permissible current level in the
busbars
b
the number of supports required, depending on the
rated short-time withstand current (Icw).
For more information on busbar calculations, see page
D-25.
Permissible current
for switchboards
Bars / phase
No. of supports Icw
(kA rms / 1 s)
IP
y
31
IP > 31
y
15
y
25
y
30
y
40
y
50
800
750
1 bar, 60 x 5 mm
1000
900
1 bar, 80 x 5 mm
7
1400
1250
2 bars, 60 x 5 mm
3
5
1800
1600
2 bars, 80 x 5 mm
Note:
the permissible current values for the busbars are given for an ambient temperature of
35 °C around the switchboard.
A set of busbars made up of two 80 x 5 mm bars per phase must be installed in a cubicle 600 mm
deep.
Busbar selection
Flat busbars, L = 1675 mm
DD380729
Designation
Cat. no.
Copper bar with holes, 60 x 5 mm
04516
Copper bar with holes, 80 x 5 mm
04518
DD381505
Busbar supports
Three fixed supports are required to maintain the vertical busbars. If more than three
supports are required, use additional free supports.
Designation
Cat. no.
Fixed support for rear flat busbars
04653
Free support (additional)
04662
DD380732
DD381652
04653.
04662.
Busbar chocks
Ametal mounting chock, 5 mm thick, is screwed to the bar. It rests on a fixed support
and maintains the position of the bar.
Icw 30 kA rms / 1 s.
The bars are secured by three mandatory fixed supports (3 x
04653) and two free supports (2 x 04662).
Designation
Cat. no.
100 mounting chocks (5 mm) for busbars
04669
DD380815
DD382303
Chocking for one bar per phase.
Chocking for two bars per phase.
Horizontal-busbar connections
DD380730
Designation
Cat. no.
1600 A connection
connection to horizontal busbars, 5 mm thick
04635
(1) (2)
connection to horizontal busbars, 10 mm
thick
Width
y
80 mm
04636
(1) (2)
Width > 80 mm
04636
(2)
+ 04642
(1)
(1)
A part of the connection must be made.
(2)
Catalogue numbers 04635 and 04636 include 1 connection only. Order 1 connection per
phase.
Rear flat busbars up to 1600 A
Flat busbars, 5 mm thick
Main distribution