engineering

Overhead cable

Overhead cable is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Overhead cable rather than just read about it. In short: An overhead cable is a cable for the transmission of information, laid on utility poles. Overhead telephone and cable TV lines are common in North America.

Key takeaways

Overhead cable belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Overhead cable to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Overhead cable from memory before moving on to harder problems.

Reference excerpt

An overhead cable is a cable for the transmission of information, laid on utility poles. Overhead telephone and cable TV lines are common in North America. These poles sometimes carry overhead power lines for the supply of electric power. Power supply companies may also use them for an in-house communication network. Sometimes these cables are integrated in the ground or power conductor. Otherwise an additional line is strung on the pylons, usually on the body of the pylon in the height of a crossbar. At several lines built by the former power supply company EVS (now part of EnBW) in Baden-Württemberg, Germany, such cables are attached like a garland on the ground conductor or on an auxiliary rope. Although many of these cables were replaced by ground conductors with integrated communication cable or free-spun communication cables many of these cables are still in use.

Cables are arranged on poles with the most dangerous cables, that is, those carrying power, strung highest. Overhead cable systems also include a number of different components for managing signal cables. These include splicing systems that allow multi-conductor cables for distributing telephone signals and snowshoe-shaped devices for reversing the direction of cables. When metal-based telephone wires are strung on the same utility poles as the power lines, they can pick up noise from the power line. Modern fiber optic telephone cable has the advantage that it can be strung next to power lines without interference. In heavily populated regions of the UK, the only overhead cable that would be visible is the telephone line. Power cables and fiber-optic cables that deliver television and broadband services are buried underground. The lesser populated regions of the UK, the countryside for example, will have overhead power cables. Although it is safer to keep the cables underground, it would be difficult to repair a line if a fault were to develop.

See also Aerial cable Optical ground wire Optical attached cable Open wire

References

Illustrations

Worked examples

Example 1 — a first encounter with Overhead cable

Start with the simplest possible case. Write down what Overhead cable claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Overhead cable before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Overhead cable ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Overhead cable

In research: Overhead cable appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Overhead cable in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Overhead cable is common in secondary-school and first-year university syllabi. It links to neighbouring topics Signal cables, Telecommunications infrastructure, so understanding it makes those chapters shorter.
In everyday life: Look for Overhead cable outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Overhead cable in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Overhead cable means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Overhead cable out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Overhead cable in simple terms?

An overhead cable is a cable for the transmission of information, laid on utility poles. Overhead telephone and cable TV lines are common in North America.

Why does Overhead cable matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Overhead cable?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Overhead cable.