Bending load
The bending radii may never be
less than the values provided by
the cable manufacturer in the
respective data sheets. At points
that bend too much, the electrical
properties of the cable change and
reduce the transmission bandwidths
and ranges.
IIf manufacturer specifications are
not available, then the following
rule of thumb applies: With loose
cabling, at least 15 times the external
cable diameter and with fixed
cabling, at least 10 times the external
cable diameter.
Buckling load
The most extreme bending loads
can cause the cable to break.
Tensile load
This is only determined by the copper
cross-section of the conductor, as
all other materials are too soft. The |
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cable may not be stressed more
than 50N/mm2(Cu cross-section) as
otherwise the conductors are
stretched and the cross-section is
reduced. If higher "pulling" forces
are required, then cables with additional
strain relief elements must be
used.
Compressive stress
Compressive stress is caused by
loads bearing down from above,
fixed clamping or sharp cable
kinking and must always be
avoided, as otherwise the "loose"
cable structure changes and the
electrical transmission properties
are impaired.
Torque strains (twisting)
These must never have an effect on
the cable, as they drive the cable
elements into one another and
therefore impair the transmission
properties. |
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