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Selection of the number of supports
● The number and cross-section of the bars are chosen for each phase, according
to the nominal rating.
● Determine the short-circuit current Icc (kA) and use the table to obtain the
maximum distance between supports.
● Based on the maximum distance between supports, obtain the number of
supports to be installed according to the following criterion:
– Three vertical supports must necessarily be fixed to the structure (ref.
NSYBVS
...).
– If more than three supports are required, the support arms must be used (ref.
NSYBSA
), in even numbers (2, 4, etc.).
● Example:
In: 2000 A, two 60 10 bars are required per phase.
Icc: 50 kA.
According to the table of maximum distance between supports they must be
325 mm.
Length of the copper bars: 1800 mm.
1700/325 = 5.23, which means 6 supports, 3 fixed vertical supports and 3 support
arms + 1 extra support for the number to be even.
Busbar support accessories
650
650
325
325 325
325
217 217 217 217 217 217
217
217
217 217 217 217 205
205
1800
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