123 / 148
C-24
Power connections for
Compact NS630b to 3200
Conductor materials and electrodynamic stresses
Compact circuit breakers can be connected indifferently with bare-copper, tinned-
copper and tinned-aluminium conductors (flexible or rigid bars, cables.
In the event of a short-circuit, thermal and electrodynamic stresses will be exerted on
the conductors. They must therefore be correctly sized and maintained in place
using supports.
Electrical connection points on all types of devices (switch-disconnectors,
contactors, circuit breakers, etc.) should not be used for mechanical support.
Any partition between upstream and downstream connections of the device must be
made of non-magnetic material.
Ties for flexible bars and cables
The table below indicates the maximum distance between ties depending on the
prospective short-circuit current.
The maximum distance between ties attached to the switchboard frame is
400 mm.
Type of
"Panduit" ties
"Sarel" ties
tie
Width: 4.5 mm
Width: 9 mm
Maximum load: 22 kg
Maximum load: 90 kg
Colour: white
Colour: black
Maximum distance 200 100 50
350 200 100 70 50 (double
ties)
between ties (mm)
Short-circuit
10
15 20
20 27 35 45 100
current (kA rms)
Note.
For cables
u
50 mm
2
, use 9 mm-wide ties.
Connection of bars
Bars must be adjusted to ensure correct positioning on the terminals before bolting
(B).
Bars must rest on a support firmly attached to the switchboard frame, such that the
circuit-breaker terminals do not bear any weight
(C)
.
Electrodynamic forces
The first spacer between bars must be positioned within a maximum distance (see
table below) of the connection point to the circuit breaker. This distance is calculated
to resist the electrodynamic stresses exerted between the bars of each phase during
a short-circuit.
Maximum distance A between the circuit-breaker connection
and the first spacer between bars, depending on the short-circuit current
Isc
(kA)
30
50
65
80
100
150
Distance
(mm)
350
300
250
150
150
150
DB128355
DB128358
B
DB128356
B
E
DB128357.
C
E
DB128359
B C
DB128360
Dimensions
and connection