Ch 1 - P 1 - Metallic Media And Electrical Conductors Flashcards
What is an electrical conductor?
Any material that can carry an electric charge from one point to another
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Name the 4 most common electrical conductors for ICT wires and Cables.
1 - Copper
2 - Copper covered steel
3 - High-strength copper alloys
4 - Aluminum
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Silver and Gold are good conductors, but they are not generally used for ICT wires and cables. Why?
Because of their high cost
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Which conductor sets the standard for comparing the conductivity of other metals?
Copper
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What type of copper is used to set the reference value?
Annealed copper
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What type of conductor is typically used for aerial, self-supporting drop wire?
Copper Covered
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How does the alloying of pure copper affect its conductivity?
The alloying of pure copper always has an adverse effect on its conductivity.
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How does the conductivity of aluminum compare the conductivity of copper?
It has about 60 percent conductivity compared to copper.
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Where are aluminum conductors commonly used?
In electrical utility distribution lines
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Where are aluminum conductors commonly used?
In electrical utility distribution lines
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Why is type of solid conductor has the poorest corrosion resistance?
High-strength alloy
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What type of solid conductor has the poorest oxidation resistance?
Aluminum
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Which type of solid conductor has the best tensile strength?
High-strength alloy
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Which type of solid conductor has the best ductility?
High Strength alloy
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What is the conductivity for a high-strength alloy conductor?
85% of typical
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How are stranded conductors created?
By bundling together a number of small-gauge solid conductors to create a single, larger conductor
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Name 4 advantages of of solid conductors:
- Less Costly
- Less complex termination systems
- Better transmission performance at high frequencies
- Less Resistance
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Name 3 advantages of stranded conductors:
- More Flexible
- Longer flex life
- Less susceptible to damage during crimp termination processes
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Which is a composite conductor?
A conductor constructed from non traditional materials (e.g., metallic resins or graphite)
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Name 5 advantages of composite conductors:
- Highly flexible
- Lightweight
- Inexpensive and easy to produce
- Easily embedded into other materials
- Low coefficient of expansion
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Name 4 disadvantages of composite conductors:
- Poor analog transmission characteristics including high attenuation, especially above 4000 Hz
- Poor digital transmission characteristics
- Easily damaged unless encased in a rigid material
- Inconsistent quality
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Are Cables with composite conductors recommended for use with modern telecommunications networks?
No. Cables with composite conductors are not recommended for use with modern telecommunications networks. If equipment is shipped with this type of cable, discard and replace it with the proper structured cabling patch cord for the project.
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Why is the AWG system important?
Because it provides a standard reference for comparing various conductor materials.
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What is the purpose of insulation on a cable?
To isolate the flow of current by preventing direct contact between conductors and a conductor and its environment.
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