25
EN
LOAD/SUPPORT CABLING:
For a load/support cabling system, use a low-ex-
pansion cable and install it as vertically and tightly as
possible to prevent the branch from falling into the
cable when it breaks and to minimise impact force.
Impact force puts unnecessary high strain on the
cable and the supporting part of the crown and will
cause them to break in many cases, depending on
how overstrained they become. The tensile strength
of the cobra tree cabling system and the anchor
point on the supporting part of the crown must be
able to bear the weight of the branch and prevent
abrupt strain. The tensile strength can be dimen-
sioned in accordance with the "ZTV Baumpflege"
recommendation (see tensile strength table below).
*
1
Minimum tensile strength of the system
For the promised service life, when installed at a point at least 2/3 the length of the part of the crown to be supported.
*
2
Basic diameter greater than 80 cm (32 in.)
A special measure is used for basic branch diameters greater than 80 cm (32 in.). In this case, a decision relating
to sizing must be made on a case-by-case basis.
Tensile strength recommendation of "ZTV Baumpflege"
FOR DYNAMIC BREAKAGE CABLING:
Basic diameter of branch/limb Minimum tensile strength*
1
up to 40 cm (16 in.)
cobra 2t
up to 60 cm (24 in.)
cobra 4t
up to 80 cm (32 in.)*
2
cobra 8t
Installation position
of load/support cabling
FOR STATIC BREAKAGE CABLING AND LOAD/SUPPORT CABLING:
Basic diameter of branch/limb Minimum tensile strength*
1
up to 30 cm (12 in.)
cobra 2t
up to 40 cm (16 in.)
cobra 4t
up to 60 cm (24 in.)
cobra 8t
up to 80 cm (32 in.)*
2
cobra 8t (doubled)
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