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A comprehensive set of questions and answers covering the isa utility specialist curriculum, specifically chapters 1-7. It covers key concepts related to safety, vegetation management, communication, and electrical principles. Valuable for students preparing for the isa utility specialist exam or for those seeking to enhance their understanding of utility operations.
Typology: Exams
1 / 47
In the U.S., enforcement of safety work rules resides with: - ANSWER
Occupational Safety & Health Administration (OSHA) Utility pruning is the pruning of trees located in the vicinity of power lines for the purpose of __________ __________ __________. - ANSWER >>> ensuring reliable service A comprehensive vegetation management program should be __________ rather than reactive, & based on principals of __________ vegetation management. - ANSWER >>> proactive; integrated What is a volt? - ANSWER >>> a unit of electrical force Major storms or __________ weather events are the usual cause of power outages over large areas. - ANSWER >>> catastrophic Without __________, messages can have multiple meanings. - ANSWER >>> context ISA BMPs provide a practical guide for implementing __________ __________. - ANSWER >>> industry standards Electrical resistance determines how much __________ is required to move electricity along a conductor and is measured in __________. - ANSWER >>> energy; ohms When communicating, a person's experience & __________ will influence how the person reacts. - ANSWER >>> perceptions
Crew mobilization for a storm event is much more rapid from a __________ status. - ANSWER >>> standby NERC standards are specific to what line voltages? - ANSWER >>> 200 kV & above An important first step in any vegetation management program should be to asses system conditions, which is often done through an __________. - ANSWER >>> inventory Which type of cuts are less unacceptable? - ANSWER >>> internodal cuts (e.g. topping) A worker neglecting to wear cut-resistant chaps while operating a chainsaw is committing an unsafe __________, while an employer failing to provide chaps is creating an unsafe __________. - ANSWER >>> act; condition A conductor carrying more than __________ volts would be considered a NERC line. - ANSWER >>> 200, Communication is both verbal & nonverbal. When a customer is confronted with contradictory information, the person will usually believe the __________ message. - ANSWER >>> nonverbal Voluntary safety standards for pruning, trimming, repairing, maintaining & removing trees, & cutting brush: - ANSWER >>> ANSI Z NERC standards require the reporting of all tree caused outages by __________ categories - ANSWER >>> three A traditional cycle will schedule maintenance __________ trees grow into conductors. - ANSWER >>> before
Which type of cuts are more acceptable? - ANSWER >>> nodal cuts (e.g. drop-crotch, thinning) The __________-__________ rule suggests that workers should take time before starting a job to check for potentially unsafe conditions & discuss them. - ANSWER >>> two-minute According to ANSI Z133, the minimum approach distance for persons other than qualified line-clearance arborists for 50 kV & less is __________. - ANSWER >>> 10 feet Trees growing into contact with a single-phase distribution conductor pose __________ threat of a tree-ground fault. - ANSWER >>> little Where should the final cut be made for proper utility pruning? - ANSWER >>> just outside of the branch bark ridge and the branch collar A vegetation management scheduling unit may be an entire __________ or a __________ __________. - ANSWER >>> circuit; geographical area 2 examples of protective equipment: - ANSWER >>> circuit breakers lightning receptors On a storm site, cutting should not begin until all risks have been assessed & the __________ approach has been decided & adopted. - ANSWER >>> safest Actively __________ can facilitate understanding a customer's perceptions and demonstrate the utility representative's sincere interest in a customer. - ANSWER >>> listening As clearance work progresses, __________ between crews & dispatcher is critically important to determine locations of downed or damaged lines. - ANSWER >>> communication
__________ negotiation uses the best aspects from both hard & soft bargaining. - ANSWER >>> interest-based An energized wire or conductor in a circuit is also known as a __________. - ANSWER >>> phase Fast-growing, problem species are sometimes known as __________ __________. - ANSWER >>> cycle busters Flush cuts damage which tissues? - ANSWER >>> the trunk Clearing for a new distribution line is likely to be paid for by a __________ budget. - ANSWER >>> capital Surface temperatures at the point of contact with high voltage can reach __________ degrees F. - ANSWER >>> 1, __________ __________ occurs when someone touches an energized fixture. __________ __________ can occur when a person touches a conductive object that is in contact with an energized fixture. - ANSWER >>> direct contact; indirect contact A grid-based scheduling system is most likely to be used by highly __________ utilities. - ANSWER >>> urbanized Why is utility pruning done? - ANSWER >>> to maintain safety and rights-of-way Reactive maintenance is often called __________. - ANSWER >>> hotspotting True or False? Guy wires are intended to help support poles but may become unintentionally energized. - ANSWER >>> true
One of the highest personal risks in a storm is __________. - ANSWER >>> fatigue When trying to negotiate mutually agreeable solutions & gain commitment based on customer interests, the focus should be on __________, no on specific individuals. - ANSWER >>> issues A __________ is similar to a fuse or cutout, but it resets after a predetermined time period. - ANSWER >>> re-closer Always consider that all lines are __________. - ANSWER >>> energized Tree replacement programs are an important aspect of many utility customer relations programs & focus on selecting: - ANSWER >>> the right tree for the right place If a structurally weak tree were on or close to the utility right-of-way, __________ __________ & __________ would be considered targets. - ANSWER >>> utility lines & equipment A challenge with grid-based scheduling is that circuits may traverse many grids, allowing for a variety of __________ __________. - ANSWER >>> tree conditions The difference in voltage between two objects someone simultaneously touches: - ANSWER >>> touch potential Which type of pruning encourages the growth of branches away from the wires? - ANSWER >>> directional pruning Minimum working distances for qualified line-clearance arborists are specified in the __________ safety standard. - ANSWER >>> ANSI Z The sound of a running home generator should alert crews to the possibility of __________. - ANSWER >>> backfeed
Measuring customer satisfaction by the number of __________ received is a very reactive approach to customer relations. - ANSWER >>> complaints Ideally, TGRs should be applied when a tree is actively growing & __________-__________ months before pruning takes place. - ANSWER >>> 2- 3 What is the maximum amount of foliage that should be removed in one growing season? - ANSWER >>> 25% (this is according to ANSI A300) The most expensive way to schedule work is: - ANSWER >>> hotspotting __________ __________ is the difference in voltage on the ground between two of a person's body parts near where electricity goes into the ground. - ANSWER >>> step potential A energized human body, tree, or climbing rope are all examples or __________ contact - ANSWER >>> indirect A contractor is paid for each tree pruned or removed when contracted using a __________ __________ contract. - ANSWER >>> unit price When is it acceptable to deviate from the pruning standards? - ANSWER >>> during storm restoration Besides pruning, __________ & __________ treatments are often part of an integrated vegetation management program. - ANSWER
mechanical & herbicide When installing underground conductors, __________ should be used in tree root protection zones. - ANSWER >>> tunneling
Crew members should always refer customer relations questions about the status of power restoration to: - ANSWER >>> the utility The __________ has been adopted by most states & regulatory bodies throughout the U.S. as the recognized document providing safety provisions for those working with or near electric supply equipment. - ANSWER >>> NESC (National Electrical Safety Code) Customer relations are important during a storm response, but are necessarily a lower priority than: - ANSWER >>> safety & power restoration Because most electrical lines are located on private property, utilities typically secure __________ to facilitate maintenance of their lines. - ANSWER >>> easements The safety acronym S.T.A.R. is valuable for preventing errors, & stands for: - ANSWER >>> Stop, Think, Act, Review Distribution transformers typically __________ primary circuit voltage for the end user. - ANSWER >>> reduce Vegetation can be chemically controlled in a selective manner with either a selective __________, or a selective __________. - ANSWER >>> herbicide; application True or False? There are no published safety data related specifically to utility arboriculture. - ANSWER >>> true Communication between vegetation managers, contractors, supervisors, & workers should be both __________ & __________. - ANSWER >>> written & verbal
Mowing often __________ woody stem count. - ANSWER >>> increases Amp: - ANSWER >>> the measure of electrical current When responding to a storm emergency, the highest priority for crews should be to: - ANSWER >>> work on the circuits feeding hospitals Because customers are well-informed & expect professionalism, a __________ __________ is the best utility representative to discuss line clearance with them. - ANSWER >>> utility arborist Service lines and secondary distribution lines usually carry voltage between __________-__________ volts. - ANSWER >>> 120- 240 Contract tree crew members can reduce customer concerns about utility work on their property by: - ANSWER >>> dressing & conducting themselves professionally When arriving on a storm site, the highest priority for the crew foreman is to: - ANSWER >>> immediately identify & locate downed electrical lines Long-term planning is __________, while short-term planning is __________. - ANSWER >>> strategic; tactical Which utility right-of-way herbicide application practice is most appropriate for brush control in areas with sensitive public relations issues? - ANSWER >>> basal treatment In the U.S., pruning should be conducted according to __________ __________. - ANSWER >>> ANSI A Of the following, which is an example of an unsafe act?
Research has shown that trees are more likely to cause outages on __________-phase lines than on __________-phase lines. - ANSWER >>> three; single Utility pruning is mainly conducted to provide __________ from power lines. - ANSWER >>> clearance Preventing vegetation-caused outages receives highest priority on __________ __________. - ANSWER >>> transmission circuits The minimum approach distance for non-qualified line clearance personnel from energized conductors 50 kV and less: - ANSWER
10 feet A revision of the ANSI Z133 standard intended to be the standard reference for those engaged in tree care work: - ANSWER >>> ANSI Z133.1- 2000 An easement agreement typically gives a utility a __________ __________ & __________ on the property owned by another party. - backpack sprayers Utility pruning removes the leaves and reduces a tree's __________ growth, but remaining __________ may grow more. - ANSWER >>> overall; shoots The term accident is in disfavor because it implies that outcomes are due to __________ __________, & is better referred to as an __________. - ANSWER >>> bad luck; incident The three most common events for fatal incidents associated with tree work are: - ANSWER >>> contact with objects/equipment (e.g. falling limbs), falls, & exposure to unsafe environment/substance (e.g. electric shock) Research has shown that trees are more likely to cause outages on __________-phase lines than on __________-phase lines. - ANSWER >>> three; single Utility pruning is mainly conducted to provide __________ from power lines. - ANSWER >>> clearance Preventing vegetation-caused outages receives highest priority on __________ __________. - ANSWER >>> transmission circuits The minimum approach distance for non-qualified line clearance personnel from energized conductors 50 kV and less: - ANSWER >>> 10 feet A revision of the ANSI Z133 standard intended to be the standard reference for those engaged in tree care work: - ANSWER >>> ANSI Z133.1- 2000 An easement agreement typically gives a utility a __________ __________ & __________ on the property owned by another party. - ANSWER >>> defined interest & use The condition that allows electricity to flow from one object to another is called: - ANSWER >>> potential When significant work such as removals or herbicide use is to take place, __________ __________ is necessary. - ANSWER >>> written authorization The time when crews return to normal working hours after being on- call or on 24-7 status: - ANSWER >>> stand down A results-based strategy designed to target trees as close as possible to the time that they interfere with facilities is known as __________- __________-__________ management. - ANSWER >>> just-in-time
What does the "I" stand for in IVM - ANSWER >>> Integrated Which clause of the Occupational Safety & Health Act requires that employers to provide their employees with working conditions that are free of known dangers? - ANSWER >>> General Duty clause Utility pruning should use __________ & __________ pruning principals - ANSWER >>> natural & targeted Each worker is responsible for their own __________. - ANSWER
safety For arboricultural operations in the U.S., the most important standard to follow when implementing a safety program is: - ANSWER >>> ANSI Z A __________ __________ structure is a prioritized outline of job components that must be completed for a successful project outcome.
density What is a Watt? - ANSWER >>> a measure of electrical power A tool used to determine the severity & likelihood of a risk: - ANSWER >>> 5 x 5 Matrix When you are communicating with a customer & are using "Active Listening", you show signs of __________, restate the customer's message to __________ __________, & temporarily suspend your __________. - ANSWER >>> attention;
check meaning; response A phase-to-phase fault occurs when there is contact between: - ANSWER >>> two or more energized conductors When you're using the "Hard Bargaining" negotiation principle, you make __________, __________ concessions. - ANSWER >>> small, incremental __________ freezes solid when it hits the ground; __________ __________ remains in a liquid state until it freezes on contact. - ANSWER >>> sleet; freezing rain When pruning near conductors, overhanging branches can be left in place, depending on __________ __________ & __________ __________. - ANSWER >>> tree species & climate conditions True or False? Pellets, dormant stem, basal, & cut stubble are all herbicide applications that can be made during winter months. - ANSWER >>> true For most utilities, vegetation management departments are considered __________ __________ that do not generate income. - ANSWER >>> cost centers Companies dedicated to workplace safety should have organized __________ __________. - ANSWER >>> safety commitees ISA recommends that safety committees meet how often? - ANSWER
monthly Purchases of equipment or line construction are considered __________ expenses, whereas supply or salaries are considered __________ expenses. - ANSWER >>> capital;
operating A pruning cycle should be based on tree __________ __________. - ANSWER >>> growth rates True or False? Herbicides are the best option to reclaim tall, overgrown or ignored urban brush areas. - ANSWER >>> false If the coating on a weatherproofed conductor falls off, the conductor will often __________. - ANSWER >>> deteriorate The __________ __________ __________ is a systematic method for command, control, & coordination of emergency response. - ANSWER >>> incident command system When you're using __________-__________ __________, you "focus on interests, not positions". - ANSWER >>> interest-based negotiations Most utilities, municipalities, & large tree contracting firms have designated storm processes & a designated __________ __________ __________ where conditions are monitored & decisions are made. - ANSWER >>> emergency operations center Under Easement Law, the owner is entitled to certain rights that are necessary for the: - ANSWER >>> full enjoyment of the easement True or False? IVM is a system of managing plant communities on rights-of-ways. - ANSWER >>> true Time & material contracts are generally __________ risk factors for contractors & __________ risk for utilities. - ANSWER >>> low; high
The theory of incident prevention that considers most incidents to be caused by unsafe acts is called the __________-__________ theory. Pioneered by Herbert Heinrich - ANSWER >>> behavior-based __________ __________ __________ can be used to reduce growth and lengthen time between cycles. - ANSWER >>> tree growth regulators Ohm's Law describes the relationship between: - ANSWER >>> voltage, current, & resistance __________ __________ contracts are gaining popularity because the responsibility for productivity, work planning, & scheduling rests with the contractor. - ANSWER >>> unit price Utilities will experience resistance to the performance of vegetation management work on a customer's property. This resistance is typically referred to as: - ANSWER >>> an easement dispute Personnel from external organizations who travel to a storm area are generally paid the higher of either their __________ __________ rates or the established __________ __________ rates. - ANSWER
home pay; local pay Manual methods for vegetation control will be done with... - ANSWER hand-used tools Which pruning style is most effective in preventing regrowth when pruning hardwoods? - ANSWER >>> crown reduction The __________ __________ is an illustration of Heinrich's principles of accident prevention. - ANSWER >>> accident pyramid Effective public relations programs include timely communication of: - ANSWER >>> Industry BMPs
In the U.S., the National Hurricane Center track forecast cone is intended to predict the track of a storm with an accuracy rate of _____ percent. - ANSWER >>> 67% Formula for Ohm's Law: - ANSWER >>> Volts = Amps x Resistance (V = I x R) What is required for the correct herbicide selection for use in water? - ANSWER >>> an aquatic label True or False? Wound dressings in most situations are effective in reducing decay, accelerating wound closure & preventing disease penetration. - ANSWER >>> false wound dressings are not effective in most situations Depreciation can be either __________-__________, in which costs are spread out over a lifetime of an item, or __________, in which the amount of depreciation taken is higher immediately after the purchase of an item. - ANSWER >>> straight-line; accelerated When is it okay to use wound dressings? - ANSWER >>> when such treatments are known to be effective (e.g. pruning oaks when/where they are susceptible to oak wilt) Sprout growth following pruning usually comes from __________ __________. - ANSWER >>> adventitious buds These days, __________ __________ require more IVM efforts, focus & successful approaches. - ANSWER >>> transmission ROWs Exchange of information that achieves desired results: - ANSWER
successful communication McClenahan described unsafe act & close calls as a safety program's __________ __________, & serious injuries or fatalities as
__________ __________. - ANSWER >>> leading indicators (bottom of safety pyramid); lagging indicators (top of safety pyramid) Removal of __________ following a storm is typically the responsibility of the customer. - ANSWER >>> brush True or False? All of the following are approaches to work planning:
A safety __________-__________ is a proactive measure in which all operations are brought to a halt until relevant safety information can be provided to response workers. - ANSWER >>> stand-down Information sent to landowners of the intention of a utility to undertake line clearance work on their trees: - ANSWER >>> notification Relative to the cost of routine maintenance, reactive maintenance can cost __________ times as much. - ANSWER >>> five Organizations such as electric utilities may declare an __________ independent of official government declarations. - ANSWER >>> emergency Tree-caused physical damage to conductors, electrical equipment, and/or supporting structures is an example of a __________ failure. - ANSWER >>> mechanical A measure of the performance of a utility in terms of the length of time customers are off line as a result of a service interruption - ANSWER
customer minutes lost (CML) Excurrent trees: - ANSWER >>> one main leader (e.g. pines, spruce) A __________-__________ organization is a group that takes a systematic approach to safety, recognizing that humans are imperfect & that errors have to be considered in the context of the system in which they occurred. - ANSWER >>> high-reliability Formula for Customer Minutes Lost (CML): - ANSWER >>> length of interruptions in minutes X number of customers off line The process of exchange of views & offers in order to reach an agreement: - ANSWER >>> negotiation
What are the three parts to the constraint triangle? - ANSWER >>> time, cost, & scope When assessing the risk of a falling object, which is more important: weight or height? - ANSWER >>> height Decurrent trees: - ANSWER >>> multiple leaders (e.g. hardwoods) The most common type of wire used today is an aluminum wire with a steel reinforced core. This wire is known as: - ANSWER >>> ACSR (Aluminum Conductor Steel-core Reinforced) Enhanced Fujita ratings are based on __________ __________ following a storm. - ANSWER >>> observed damage A measure of the number of interruptions that occur on a utility's system - ANSWER >>> system average interruption frequency index (SAIFI) Restating or paraphrasing a message & suspending a response in order to discern the message: - ANSWER >>> active listening With respect to personnel management, what is the most common reason that people leave jobs? - ANSWER >>> treatment from supervisors Heavy, wet snows have a snow-to-water equivalent that is: - ANSWER >>> 10:1 or less Voltage Ranges: Extra-high transmission lines: __________-__________ volts Transmission lines: __________-__________ volts Subtransmission lines: __________-__________ volts Distribution lines: __________-__________ volts - ANSWER >>> 345,000-765,000 volts 115,000-230,000 volts
23,000-115,000 volts 2,400-23,000 volts What height is considered to be the approximate death threshold? - ANSWER >>> 40 ft a single- or multiple-blade arrangement that rotates horizontally & cuts or shreds vegetation - ANSWER >>> rotary cutting head A method of negotiation whereby one party takes a position and will not give way on part of it even if this action disadvantages the other party: - ANSWER >>> hard bargaining On the Saffir-Simpson Hurricane Wind Scale, a storm must be at least which category to be considered major? - ANSWER >>> 3 Death from electric shock is known as: - ANSWER >>> electrocution Type of preventative maintenance that uses field data to diagnose & monitor a condition or system. - ANSWER >>> predictive maintenance (aka on-condition maintenance) The voltage between the feet of a person standing near an energized, grounded object: - ANSWER >>> step-potential A method of applying herbicides or TGRs to trees through the soil by excavating a shallow trench in the soil around the base of the trunk & pouring the compound into the trench - ANSWER >>> soil drench A method of negotiation in which one party concedes to many positions, even to their own disadvantage, on order to accommodate the other party: - ANSWER >>> soft bargaining Soil removed during trenching should be stored where? - ANSWER
on the side of the trench that is away from the tree
Contact with only __________ milliamps can make a person unable to release their grip. __________ milliamps can cause respiratory paralysis. __________ milliamps can cause ventricular fibrillation, leading to death. - ANSWER >>> 16; 20; 100 Governments sometimes mandate clearance distances, maintenance intervals, inspection intervals, or require available resources to be focused on: - ANSWER >>> the worst-performing circuits (in terms of VM) A standardized method for improving the overall effectiveness of emergency response is known as the __________ command system.
Advantages of providing temporary accommodations for a large-scale disaster response: - ANSWER >>> - Oversight
Z133 American National Standard for Arboricultural Operations - Safety Requirements It's more effective to base maintenance cycles on __________ __________ rather than fixed distances. - ANSWER >>> growth rates __________ lines come off of primary circuits, but don't extend directly to a customer's property. - ANSWER >>> secondary True or False? Coniferous trees that have frequent, heavy snows are better adapted to snow loading than such trees in areas where snow is rare. - ANSWER >>> true A term used to describe the brown appearance of dead foliage following the application of herbicide - ANSWER >>> brownout Regulations that address & specify minimum clearance distances to be maintained between vegetation & conductors & also address issues pertaining to flammable liquids, hazardous materials storage,
explosives, & new construction & building operations: - ANSWER >>> Uniform Fire Code (UFC) __________ __________ __________ serve as a barrier between workers & electric hazards. - ANSWER >>> minimum approach distances Process where trees growing significantly faster than most other trees are pruned at approximately half the scheduled maintenance cycle length: - ANSWER >>> mid-cycle pruning A device that can store energy & is used to either boost voltage or provide power factor correction: - ANSWER >>> capacitor The collective efforts to assist in the restoration of utility services is known as __________ __________. The process of repairing damage & restoring service after a storm is known as __________ __________. - ANSWER >>> storm response; storm recovery Machines designed to cut vegetation by means of a moving blade, chain, or other cutting device - ANSWER >>> flail-type cutter Two classifications of arborists that work inside 10-foot minimum approach distances: - ANSWER >>> incidental & qualified Regulations that address & specify minimum clearance distances & also address proper planning, construction techniques, defensible space, vegetation control, & land uses; developed by the International Fire Code Institute: - ANSWER >>> Urban-Wildland Interface Code (UWIC) Crisis management is an indicator of chronic __________. - ANSWER >>> underfunding
A model for the production of reaction zones - ANSWER >>> Compartmentalization of Decay in Trees (CODIT) The potential between live conductors or between live & nuetral conductors is known as __________-to-__________ potential. - ANSWER >>> phase-to-phase A method to minimize tree-caused outage by conducting a detailed analysis of the system, vegetation conditions, outage history, infrastructure, etc. & identifying a range of preventable maintenance that have the potential to provide greater reliability & cost efficiency than just pruning/removing vegetation - ANSWER >>> reliability- centered management (RCM) __________ line clearance applies when an electric hazard exists but work is not being done for the utility. __________ line clearance applies to being in proximity to electric hazards on behalf of the utility.
An individual who is familiar with the equipment & hazards in line clearance & has demonstrated the ability to perform the techniques involved: - ANSWER >>> qualified line-clearance arborist The length of a branch or trunk to be considered when evaluating the combination of forces that could lead to failure: - ANSWER >>> lever arm Most utilities list __________ __________ as a reason for maintaining vegetation, but customers often underestimate the risk. - ANSWER
public safety Protective equipment is designed to shield the system from: - ANSWER >>> faults, short circuits, & current surges A concept in project management that shows the interrelation of the resources of time, cost, & scope; often depicted by the constraint triangle: - ANSWER >>> triple constraint __________ transmits laser pulses toward a target, records the time it takes to return to sensors, & translates the results into a virtual image of the right-of-way; it stands for: - ANSWER >>> LiDAR; Light Detection and Ranging A large area of low atmospheric pressure, characterized by inward-
spiraling winds: - ANSWER >>> cyclone What is the first thing to do when you find a tree or tree part on the line? - ANSWER >>> contact the utility control center People with an interest or concern in an organization & its decisions are known as: - ANSWER >>> stakeholders The effect that causes cyclones to rotate clockwise in the Southern hemisphere & counterclockwise in the Northern hemisphere: - ANSWER >>> Coriolis force
Project management stratification of the entire scope of work need to accomplish a project's objectives: - ANSWER >>> work breakdown structure The potential between live conductors & the ground is known as __________-to-__________ potential. - ANSWER >>> phase-to- ground __________ __________ is the management of vegetation by establishing & conserving compatible, stable plant communities using natural competition, animals, insects, or pathogens. - ANSWER >>> biological control If you find a tree leaning on a line, stay at least __________ ft away. - ANSWER >>> 35 Because of high turnover among contractors who perform VM, safety & basic job skill training tends to have a higher priority than __________ training. - ANSWER >>> communications In project management, the longest period of time a series of tasks requires from project beginning to end: - ANSWER >>> critical path __________ __________ are designed to redirect electrical surges to the ground instead of allowing them to continue down the circuit. - ANSWER >>> lightning arrestors Mixing of chemicals should be done with a buffer of at least __________ ft from a body of water or wetland. - ANSWER >>> 100 ft __________ __________ provide defense against inadvertent re- energization. - ANSWER >>> protective grounds A tropical cyclone with wind speeds 74 mph or greater: - ANSWER
hurricane