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Subelement T0
Electrical safety: AC and DC power circuits; antenna installation; RF hazards
Section T0B
Antenna safety: tower safety; erecting an antenna support; overhead power lines; installing an antenna
When should members of a tower work team wear a hard hat and safety glasses?
  • At all times except when climbing the tower
  • At all times except when belted firmly to the tower
  • At all times when any work is being done on the tower
  • Only when the tower exceeds 30 feet in height

It only takes one time that you don't use safety equipment to cause permanent injury or death. The small inconvenience of a hard hat and safety glasses is not worth the risk of injury. Find your motivation and stay safe.

Last edited by jsharris1229. Click here to edit

Tags: safety arrl chapter 9 arrl module 18

What is a good precaution to observe before climbing an antenna tower?
  • Make sure that you wear a grounded wrist strap
  • Remove all tower grounding connections
  • Put on a climbing harness and safety glasses
  • All of the these choices are correct

Safety comes first in regards to tower work. Make sure that your climbing harness is in working order, fitted tightly and comfortably, and you have safety glasses protecting your eyes.

Last edited by floresea. Click here to edit

Tags: safety arrl chapter 9 arrl module 18

Under what circumstances is it safe to climb a tower without a helper or observer?
  • When no electrical work is being performed
  • When no mechanical work is being performed
  • When the work being done is not more than 20 feet above the ground
  • Never

Always take the time to get someone to help. Never climb a tower without someone else to help or observe.

Last edited by floresea. Click here to edit

Tags: safety arrl chapter 9 arrl module 18

Which of the following is an important safety precaution to observe when putting up an antenna tower?
  • Wear a ground strap connected to your wrist at all times
  • Insulate the base of the tower to avoid lightning strikes
  • Look for and stay clear of any overhead electrical wires
  • All of these choices are correct

These two answers are clearly incorrect. A grounded wrist strap is for use on electronics and won't help when working on a tower. Insulating the base won't stop lightning strikes and eliminates the grounding system that protects the tower. The only answer that is an important safety precaution is to look for and stay clear of overhead electrical wires. The tower, guy wires and you should be well clear of any overhead electrical wires. Refer to question B06 for more information on safe distances.

Last edited by camplate. Click here to edit

Tags: safety towers arrl chapter 9 arrl module 18

What is the purpose of a gin pole?
  • To temporarily replace guy wires
  • To be used in place of a safety harness
  • To lift tower sections or antennas
  • To provide a temporary ground

A gin pole is a temporary mast that is used to lift materials for tower construction. It also supports the materials while they are installed on the tower. It is much safer than lifting materials directly because you can focus on the installation instead of the heavy lifting.

Last edited by jsharris1229. Click here to edit

Tags: safety towers arrl chapter 9 arrl module 18

What is the minimum safe distance from a power line to allow when installing an antenna?
  • Half the width of your property
  • The height of the power line above ground
  • 1/2 wavelength at the operating frequency
  • So that if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the power wires

None of the other three answers provide any indication of how close the antenna will be to the power line if it falls. Note that this is the minumum and should only be used when necessary. It is better to create more distance than the 10 foot minimum whenever practical.

Last edited by joseph farkas. Click here to edit

Tags: safety arrl chapter 9 arrl module 18

Which of the following is an important safety rule to remember when using a crank-up tower?
  • This type of tower must never be painted
  • This type of tower must never be grounded
  • This type of tower must never be climbed unless it is in the fully retracted position
  • All of these choices are correct

Obviously, the tower must be grounded. Clearly, the important safety precaution is to not climb the tower unless fully retracted. Climbing the tower requires that your hands and feet are placed between the parts of the tower that slide adjacent to each other. You can think of the tower as a possible guillotine that can severely injure and even remove body parts that are in the way if it accidently slips. Even when retracted, it is a good idea to block the tower to prevent the sections from moving.

Last edited by bdengle32@yahoo.com. Click here to edit

Tags: safety towers arrl chapter 9 arrl module 18

What is considered to be a proper grounding method for a tower?
  • A single four-foot ground rod, driven into the ground no more than 12 inches from the base
  • A ferrite-core RF choke connected between the tower and ground
  • Separate eight-foot long ground rods for each tower leg, bonded to the tower and each other
  • A connection between the tower base and a cold water pipe

The general idea of grounding a tower is to provide a short, direct path for high voltage/current lightning strikes to ground. If a single ground rod is used, it increases the distance required and drops the efficiency of the grounding system. A single four-foot grounding rod is not adequate to handle typical electrical energy generated in a lightning strike. Clearly, the ferrite-core RF choke is of no use, as it is used in electronic circuits. In addition to that, connecting the tower to a cold water pipe poses a serious safety concern for people who might be near the plumbing in the house the water pipe connects to. The best answer is long (8-10ft) grounding rods, one for each tower leg, that are bonded to the tower and to each other.

Last edited by nbiggers2023. Click here to edit

Tags: grounding safety towers arrl chapter 9 arrl module 18

Why should you avoid attaching an antenna to a utility pole?
  • The antenna will not work properly because of induced voltages
  • The utility company will charge you an extra monthly fee
  • The antenna could contact high-voltage power wires
  • All of these choices are correct

It should be pretty obvious that any antenna should be far away from power lines, both to avoid accidental contact and to avoid interference. Also consider that installing and maintaining the antenna exposes you to the risk of accidental contact with the power wires as well.

To eliminate the all are correct, note that a SIGNED legal contract would be required to attach ANYTHING to an electric company pole! Therefore, it is highly unlikely that you would be given the permissions to utilize a utility pole.

Last edited by martyman. Click here to edit

Tags: safety antenna arrl chapter 9 arrl module 18

Which of the following is true concerning grounding conductors used for lightning protection?
  • Only non-insulated wire must be used
  • Wires must be carefully routed with precise right-angle bends
  • Sharp bends must be avoided
  • Common grounds must be avoided

Sharp bends, which includes right angles, must be avoided. While non-insulated wire is generally used for grounding, it is not required. For example, metal straps may be used instead of wires, but you won't see this commonly. Common grounds are recommended. The best grounding system uses conductors that are as short and straight as possible.

"Short and Direct"

Last edited by rockinjay. Click here to edit

Tags: safety grounding arrl chapter 9 arrl module 18

Which of the following establishes grounding requirements for an amateur radio tower or antenna?
  • FCC Part 97 Rules
  • Local electrical codes
  • FAA tower lighting regulations
  • Underwriters Laboratories' recommended practices

Because the grounding system falls under an electrial installation, it is governed by local electrical codes. Most local codes are based on the National Electrical Code (NEC), so in most cases they will just refer you to the NEC. You should be aware that local codes vary dramatically throughout the United States in terms of who can inspect and approve electrical installations, so it's always a good idea to check with your local code enforcement office to find out what the requirements are.

Last edited by kd7bbc. Click here to edit

Tags: rules and regulations grounding towers antenna arrl chapter 9 arrl module 18

Which of the following is good practice when installing ground wires on a tower for lightning protection?
  • Put a loop in the ground connection to prevent water damage to the ground system
  • Make sure that all bends in the ground wires are clean, right angle bends
  • Ensure that connections are short and direct
  • All of these choices are correct

Use large wires over short distances on a direct path to the grounding rods - Lightning is high voltage, high current electricity, short and direct paths will lesson the chance of electricity to jump to near by conductors.

The answers of using loops and right angles are the opposite of using short and direct connections. Lightning is high voltage, high current electricity.

Bends in the wire may allow the electricity to 'jump' from the wire to nearby conductors, thereby defeating the grounding system.

The longer the wires are, the more resistance there is and the hotter the wire will get.

Once again: Use large wires over short distances on a direct path to the grounding rods - short and direct.

Last edited by pholman1960. Click here to edit

Tags: grounding safety arrl chapter 9 arrl module 18

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