9. TREE SUPPORT/LIGHTNING WORKBOOK Flashcards
What is the difference between common-grade cable and extra-high-strength (EHS) cable?
Common-grade cable is more flexible and easier to work with, while EHS cable is stronger but less flexible.
What is an advantage of wire rope?
It is both strong and flexible.
How far from the weak branch union should cables be installed?
Two-thirds of the distance to the top of the tree, as long as the wood is solid.
What happens to branches when they are brought closer together while installing a cable?
When released, the cable will be just taut.
True/False – Attachment hardware should be installed with the cable’s pull in direct line with the attachment.
True
True/False – When installing more than one cable on the same branch, the hardware should be spaced apart at least the diameter of the branch.
True
True/False – When installing multiple cables, common anchors should be used whenever possible.
False
What type of hardware should extra-high-strength cables be attached to?
Dead-end grips.
True/False – If steel cables are installed properly, they will not wound the tree.
False
True/False – Rope support systems may reduce shock loading by allowing movement.
True
True/False – An advantage of rope support systems is that they do not require drilling.
True
True/False – A single rod used for support should be installed just below the branch union.
False
What is guying?
The installation of a cable between a tree and an external anchor for support and movement reduction.
What are rigid structures built on the ground to support a trunk or branch called?
Props
What is an advantage of the amon-eye system over the eye bolt?
The length of the rod can be adjusted.
What is the purpose of a lightning protection system?
To conduct the electrical charge into the soil away from the tree.
Prevent strike
Reduce voltage of strike
How should two bracing rods be installed to support a weak union?
Staggered and no closer together than the trunk’s diameter.
To install a cable across a branch union, where should it be positioned?
Perpendicular to an imaginary line bisecting the union.
What is a key advantage of rope support systems?
They don’t require drilling for installation.
