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25 Cards in this Set
- Front
- Back
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Support A Weak Crotch Support for Multi-Stemmed Trees Weak-Wooded Tree |
Name 3 instances in which cabling might be called for: |
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Extra-High-Strength |
Common-grade cable is relatively malleable (bendable) & easy to work with. _______ - _______-_______ cable is much stronger but less flexible than common-grade cables
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Aircraft Cable |
One advantage of _______ _______ is that it's both strong & flexible. A potential drawback is the limitation of choices for attachment.
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Two-Thirds |
As a general rule, cable should be installed _______ - _______ the distance from the weak branch union to the top of the tree, as long as the wood is solid & large enough to install the hardware.
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Taut |
Limbs may be brought closer together while installing the cable, so that when released, the cable will be just _______.
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Lag Eyes, Lag Hooks |
Dead-end hardware such as _______ _______ or _______ ______ can be used as anchors in smaller branches that are not decayed.
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Eye Bolts, Threaded Rods, Amon-Eye Nuts |
In decayed wood, or limbs greater than 8 in (20 cm) in diameter, _______ _______ or _______ _______ with _______ - _______ _______ must be used to attached cables.
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True |
True or False: When more than one cable is installed on the same limb, the hardware should be spaced at least as far apart as the diameter of the limb.
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Thimble |
A _______ is used to form the eye at the end of a cable.
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Dead-End Grips |
EHS cable should be attached to hardware using _______ - _______ _______.
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False |
True/False: The installation of metal cables, if done properly, will not wound the tree.
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Machine-Threaded Rods, Lag-Threaded Rods |
The two types of rods commonly used to brace a tree are _______ - _______ _______ & _______- ________ _______.
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Larger |
When bracing a tree with a machine-threaded rod, the pre-drilled hole should be approximately 1/16 to 1/8 in (1.6 to 3.2 mm) ________ than the diameter of the rod.
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Dynamic Support Systems |
_______ _______ _______ allow for more tree sway, enacting restraint only when environmental conditions demand it.
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Guying |
_______ is the installation of a cable between a tree & an external anchor to provide supplemental support & reduce tree movement.
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Props |
Rigid structures mounted or built on the ground to support a branch or trunk are called _______. |
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Side Flash |
A phenomenon in which lightning travels down the stem for a distance & then leaves the tree, "jumping" to a more conductive tree, structure, person or animal is called _______ _______.
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Copper |
The main conductor of a lightning protection system is a cable made of _______.
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35 ft (10 m) |
If a tree has a crown radius smaller than _______ ft (_______ m), only one conductor is required.
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Historic Trees Valuable Trees Trees Prone to Strikes (golf/park) |
Name 3 circumstances in which lightning protection for trees might be recommended.
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B |
An advantage of the amon-eye system over the use of an eye bolt is:
a.) no washers are needed on the terminations b.) the length of the rod can be adjusted c.) they are considered stronger than eye bolts d.) the eye bolt is not drop-forged |
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C |
The purpose of a lightning protection system is to:
a.) reduce the voltage of the strike b.) prevent the tree from being struck c.) conduct the electrical charge into the soil away from the tree d.) all of the above |
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C |
If two bracing rods are installed to support a weak union, they should be placed:
a.) no more than 4 in (10 cm) apart b.) in vertical alignment, one above the other c.) staggered & no closer together than the diameter of the trunk d.) never use more than one brace rod per crotch |
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D |
If a lag hook is installed into decayed wood, the:
a.) a decay will likely spread along the lag b.) holding power will be reduced c.) decay may be detected with drilling d.) all of the above |
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A |
When cabling a multi-stemmed tree, extra support can be added to the system by: a.) cabling the limbs, together in triangular combinations b.) using double cables on each lag c.) installing the cables low in the tree with turnbuckles that can be tightened from the ground d.) all of the above |
