  PMA
AG recommend to use fixation clips or clamps with conduit systems
every 300 mm
to 500 mm. The mounting distance may be bigger or smaller depending on
application and position.
This recommendation is applied to all available dimensions. With bigger diameters,
the increased load (through the inside lying cables and wires) will be taken
into account by retaining the fixation distances.
PMA offers suitable system supports for different requirements and application
areas.
The standard EN 50343:2003-5.15 "Railway
applications - Rolling stock - Rules
for installation of cabling" intend
to apply fixations as following:
 Horizontal
wiring: 300 mm
Vertical
wiring: 500 mm
(Application specific guidelines and standards have to be additionally considered)
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