Electrical Safety Clearances Quiz

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Questions and Answers

What is the primary focus of the content related to 'Constant-current circuits'?

  • Maintaining a stable current flow in circuits
  • Ensuring the safe operation of electrical systems (correct)
  • Optimizing the efficiency of electrical circuits
  • Managing the voltage drop across a circuit

Which of the following is NOT specifically mentioned as a factor requiring clearance in constant-current circuits?

  • Power transformers (correct)
  • Fire hydrants
  • Railroad tracks
  • Streets and roads

What is the minimum vertical clearance required between wires and conductors, and unguarded rigid live parts of equipment?

  • 10 feet (correct)
  • 15 feet
  • 25 feet
  • 20 feet

The additional clearances for wires and equipment operating at voltages exceeding 22 kV are primarily intended to:

<p>Prevent potential hazards (B)</p> Signup and view all the answers

What is the minimum vertical clearance required above roadways, rail, or water surfaces for wires, conductors, cables, and equipment, according to the provided content?

<p>The specific clearance depends on the voltage level (D)</p> Signup and view all the answers

Which of the following is a factor that influences the required electrical clearance for constant-current circuits?

<p>The voltage level of the circuit (D)</p> Signup and view all the answers

What is the purpose of maintaining clearances around equipment cases, switch handles, and support arms?

<p>To prevent accidental contact with live parts (C)</p> Signup and view all the answers

Based on the content, when would additional electrical clearance be necessary?

<p>When the voltage level exceeds 22 kV (A)</p> Signup and view all the answers

Which of the following areas is NOT classified as a hazardous location according to the provided content?

<p>Boilers (C)</p> Signup and view all the answers

What is the minimum voltage requirement for a working space to be considered a hazardous location?

<p>600 V (B)</p> Signup and view all the answers

Which of the following substances is classified as a hazardous material in the content?

<p>Sulfur (B)</p> Signup and view all the answers

According to the content, what type of system is associated with 'Gaseous Hydrogen'?

<p>Supply (D)</p> Signup and view all the answers

In the context of the document, 'LPG' refers to:

<p>Liquefied Petroleum Gas (A)</p> Signup and view all the answers

Which of these is NOT explicitly mentioned as a classified location in the document?

<p>Gaseous Nitrogen (C)</p> Signup and view all the answers

Which of the following is NOT a category listed in the content as a hazardous location?

<p>Boilers (C)</p> Signup and view all the answers

According to the content, what is the primary focus of the section titled 'Classified Locations'?

<p>To identify and categorize areas with potential hazards (B)</p> Signup and view all the answers

What is the vertical clearance requirement for voltages exceeding 22 kV?

<p>Not specified in the text. (A)</p> Signup and view all the answers

What is the difference in clearance requirements between horizontal and vertical distances?

<p>Horizontal clearances only consider wind displacement. (C)</p> Signup and view all the answers

What is the minimum clearance required for wires and conductors from buildings when the voltage exceeds 98 kV AC to ground or 139 kV DC to ground?

<p>It is not defined in the provided text. (A)</p> Signup and view all the answers

What is the primary focus of the section titled "Clearance of wires, conductors, cables, and equipment from buildings, bridges, rail cars, swimming pools, and other installations"?

<p>To ensure adequate spacing between energized components and other structures. (B)</p> Signup and view all the answers

Which of the following is NOT a factor considered when determining clearance requirements for wires and conductors from buildings?

<p>Type of building material. (A)</p> Signup and view all the answers

What is the primary purpose of guarding supply conductors and rigid live parts?

<p>To prevent accidental contact with energized components. (D)</p> Signup and view all the answers

Which of the following is NOT an installation mentioned in the context of clearance requirements for wires and conductors?

<p>Overhead power lines. (B)</p> Signup and view all the answers

What is the minimum horizontal clearance required between wires and conductors, and other supporting structures?

<p>Not specified in the provided text. (B)</p> Signup and view all the answers

What are the different types of line and equipment relative levels discussed in the content?

<p>All of the above (D)</p> Signup and view all the answers

According to the content, what is the preferred relative level for supply and communication conductors and equipment?

<p>Supply conductors should be higher than communication conductors. (A)</p> Signup and view all the answers

What is the voltage classification range mentioned for supply lines in the content?

<p>0 to 750 V, 750 V to 8.7 kV, 8.7 kV to 22 kV, 22 kV to 50 kV, and over 50 kV (A)</p> Signup and view all the answers

What are the two main categories of relative level considerations discussed in the content?

<p>Supply and Communication Conductors and Equipment and Supply Lines of Different Voltage Classifications. (B), Supply and Communication Conductors and Equipment and Supply Lines of Different Voltage Classifications. (D)</p> Signup and view all the answers

What are the two specific aspects of relative levels discussed for supply lines of different voltage classifications?

<p>At crossings or conflicts and on structures used only by supply conductors. (B)</p> Signup and view all the answers

What is the primary focus of the section on Vegetation Management?

<p>Both A and C (A)</p> Signup and view all the answers

What specific areas are mentioned in the content regarding vegetation management ?

<p>All of the above (D)</p> Signup and view all the answers

What are the key topics covered in the content related to Attachments, Decorations, and Obstructions?

<p>Unusual conductor supports and protection and marking of guys. (A)</p> Signup and view all the answers

What is the basic clearance requirement for line wires, conductors, and cables, and service drops of the same or different circuits?

<p>A clearance specified elsewhere (A)</p> Signup and view all the answers

For what voltage level are alternate clearances provided, where either or both circuits exceed the specified value?

<p>98 kV ac to ground or 139 kV dc to ground (D)</p> Signup and view all the answers

Which of the following are listed as factors determining clearances at or near a support?

<p>Line conductors to supports, vertical or lateral conductors, service drops, and span or guy wires. (A)</p> Signup and view all the answers

Where can you find information on clearances between circuits located in the supply space on the same support arm?

<p>Section F - Clearances between circuits located in the supply space on the same support arm (D)</p> Signup and view all the answers

What does the term "communication worker safety zone" refer to?

<p>The area around a communication line where workers must maintain a safe distance. (C)</p> Signup and view all the answers

Where are the alternate clearances for different circuits where one or both circuits exceed 98 kV ac to ground or 139 kV dc to ground discussed?

<p>Section C - Vertical clearance at the support (A)</p> Signup and view all the answers

What are "span wires"?

<p>Wires that run horizontally across a span between two supports. (D)</p> Signup and view all the answers

Which of these is NOT a factor considered when determining clearances in any direction at or near a support?

<p>The size of the conductor (D)</p> Signup and view all the answers

What type of clearance is discussed in Section D of the content?

<p>Clearances between conductors at different levels on the same structure. (E)</p> Signup and view all the answers

Which of the following elements is NOT specifically mentioned as requiring safeguarding in the context of vertical supply conductors and cables passing through communication space on jointly used line structures?

<p>Protective devices for electrical surges (A)</p> Signup and view all the answers

In the provided content, what is the primary focus of the section concerning 'Requirements for vertical communication conductors passing through supply space on jointly used structures'?

<p>Ensuring proper grounding of communication conductors (A)</p> Signup and view all the answers

What specific type of communication cable is explicitly mentioned as requiring special consideration when passing through supply space on jointly used structures?

<p>Metal-sheathed communication cable (D)</p> Signup and view all the answers

Based on the content provided, what specific aspect is emphasized when discussing 'Operating rods'?

<p>They must maintain specific clearances from other components (D)</p> Signup and view all the answers

Which of the following is NOT directly mentioned as a requirement for 'Standoff brackets' in the context of electrical installations?

<p>They must be made from non-conductive materials (C)</p> Signup and view all the answers

What does the provided content suggest is the primary objective of the 'Grades of construction' section?

<p>To establish the minimum acceptable safety standards for electrical design (A)</p> Signup and view all the answers

Which of the following areas is NOT specifically mentioned as requiring additional considerations or specific clearance requirements in the content?

<p>Constant-current circuits (A)</p> Signup and view all the answers

The provided content does not explicitly define 'hazardous locations'. However, it does mention that 'electrical clearance' is influenced by 'the type of equipment and its location near combustible materials' and 'the voltage'. Based on this information, which would likely be considered a 'hazardous location'?

<p>A basement with significant storage of flammable liquids (D)</p> Signup and view all the answers

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Flashcards

Working space over 600 V

Refers to areas designated for operating equipment energized at more than 600 volts.

Equipment for work on energized parts

Tools and protective gear required when performing tasks on live electrical components.

Classified locations

Areas designated based on the presence of hazardous materials or conditions.

Coal-handling areas

Zones where coal is stored, transported, or processed, necessitating specific safety measures.

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Flammable and combustible liquids

Liquids with properties that can ignite and pose fire hazards.

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Flammable liquid storage area

Designated spaces for safely storing flammable liquids to minimize fire risks.

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Gaseous hydrogen systems

Equipment and infrastructure used for handling gaseous hydrogen, focusing on storage and distribution.

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Liquefied petroleum gas (LPG)

A mixture of propane and butane used as fuel in heating and vehicles.

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Vegetation Management

Strategies to control plant growth near utility lines.

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Marking of Guys

Identification and protection of guy wires used for support.

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Relative Levels

Standards for the height and position of conductors and equipment.

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Preferred Levels

Recommended positions for conductors to ensure proper spacing.

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Voltage Classifications

Categories based on voltage ranges for supply lines.

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Structure Usage

Guidelines for using structures solely for supply conductors.

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Special Construction

Design requirements for specific lines, like those carrying 600 V or less.

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Crossing Conflicts

Guidelines for managing intersections of different conductors.

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Vertical clearance

The minimum height required for safe clearance of overhead conductors.

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Clearance requirements

Specific heights and distances needed for safe electrical installations.

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Voltage clearance

Spacing required between electrical components based on voltage levels.

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Horizontal clearances

The required distance from wires to nearby objects to ensure safety.

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Wind displacement

The movement of wires caused by wind that affects clearance requirements.

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Transition clearances

Clearance adjustments when moving from horizontal to vertical setups.

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Guarding of conductors

Methods to protect live electrical parts from accidental contact.

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Clearance from structures

Minimum spaces required between wires and various installations like buildings.

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Clearances in circuits

The required distances between electrical circuits and other structures to ensure safety.

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Fire hydrant clearance

Minimum distance that supporting structures must maintain from fire hydrants.

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Roadway clearance

Vertical clearances required for wires and equipment above road surfaces.

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Railroad clearance

Distance between supporting structures and railroad tracks for safety.

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Wires clearance application

Rules for maintaining distances of wires, conductors, and equipment aboveground.

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Clearance for unguarded parts

Safety distance for unguarded rigid live parts of equipment.

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Support arms clearance

Required space around support arms, switch handles, and equipment cases.

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High voltage clearance

Additional clearances needed for equipment with voltages exceeding 22 kV.

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Vertical Supply Conductors

Conductors and cables that are positioned vertically within structures for electrical supply.

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Guarding Requirements

Safety measures designed to protect conductors and cables in shared communication spaces.

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Clearance from Metal Objects

Required distance that conductors must maintain from through bolts and metal components.

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Metal-Sheathed Communication Cables

Cables that have a metal coat for protection against interference and damage.

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Service Drops

Cables that connect the overhead conductors to a service entrance, typically at a building.

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Communication Grounding Conductors

Wires that provide a path to the ground for communication systems, enhancing safety.

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Standoff Brackets

Supports designed to hold communication cables away from structures to avoid damage.

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Operating Rods

Tools used to operate electrical switches or devices remotely to enhance safety.

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Basic clearance for circuits

Standard distances between line wires, conductors, or cables, and service drops of the same or different circuits.

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Additional clearances

Extra distances mandated when specific conditions or higher voltages are present, exceeding normal requirements.

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Communication worker safety zone

An area designated for the safety of workers handling communication lines near power circuits.

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Diagonal clearance

The measured distance between line wires and conductors at different levels on the same support structure.

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Clearances near supports

Required distances from line conductors to supports, service drops, and other structures attached to the same support.

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Clearances for high voltages

Specific distances required for circuits exceeding 98 kV ac or 139 kV dc to reduce hazards.

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Conductor spacing

The required distance between conductors on vertical racks or separate brackets, ensuring safe operation.

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Related Documents

NESC C2 2017 Part 1 PDF

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