ISA Certified Arborist Chapter 9 (Tree Support and Lightning Protection) Questions and Answers 100% Verified

ISA Certified Arborist Chapter 9 (Tree Support and Lightning Protection) Questions and Answers 100% Verified Name 3 instances in which cabling might be called for in a tree. a) support a weak crotch b) support for multi stemmed trees c) support for weak wooded trees Common-grade cable is relatively malleable (bendable) and easy to work with. ________ - _________ - ________ cable is much stronger but less flexible than common-grade cables. extra-high-strength One advantage of _______ _______ is that it is both strong and flexible. A potential drawback is the limitation of choices for attachment. aircraft cable As a general rule, cables should be installed _______ - _______ the distance from the weak branch union to the top of the tree, as long as the wood is solid and large enough to install the hardware. two-thirds Limbs may be brought closer together while installing the cable, so that when released, the cable will be just _______. taut Dead-end hardware such as _______ _______ or _______ _______ can be used as anchors in smaller branches that are not decayed. lag eyes, lag hooks In decayed wood, or limbs greater than 8 inches (20 cm) in diameter, _______ _______ or _______ _______ with _______ - _______ _______ must be used to attach cables. eye bolts, threaded rods, amon-eye nuts True/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. True A _________ is used to form the eye at the end of a cable. thimble EHS cable should be attached to hardware using _______-_______ _______. dead-end grips True/False - The installation of metal cables, if done properly, will not wound the tree. False The two types of rods commonly used to brace a tree are _______-_______ _______ and _______-_______ _______. machine-threaded rods, lag-threaded rods When bracing a tree with a machine-threaded rod, the pre-drilled hole should be approximately 1/16 to 1/8 inch (1.6 t0 3.2 mm ) _______ than the diameter of the rod. larger _______ _______ _______ allow for more tree sway, enacting restraint only when environmental conditions demand it. dynamic support systems ________ is the installation of a cable between a tree and an external anchor to provide supplemental support and reduce tree movement. guying Rigid structures mounted or built on the ground to support a branch or trunk are called ______. props A phenomenon in which lightning travels down the stem for a distance and then leaves the tree, "jumping" to more conductive tree, structure, person, or animal is called ______ ______. side flash The main conductor of a lightning protection system is a cable made of copper. copper If a tree has a crown radius smaller than _____ ft (_____ m), only one conductor is required. 35 feet (10 m) Name three circumstances in which lightning protection for trees might be recommended. historic trees valuable trees large tees where people may seek refuge in a storm, such as on a golf course An advantage of the amon-eye system over the use of an eye bolt is... the length of the rod can be adjusted The purpose of a lightning protection system is to... conduct the electrical charge into the soil away from the tree