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ElectricalPower System
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Name the cable or conductor which connects the distributor to the consumer terminals.

A

Service Mains

B

Distributor

C

Feeders

D

None of the above

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleElectricalPower System
Option A

Service Mains

Quick Summary:

The service mains are the final link in the power distribution system that connects the distributor (which carries power along streets) to the individual consumer's terminals or energy meter. It essentially acts as a bridge between the utility supply and the end-user premises.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

The service mains are the final link in the power distribution system that connects the distributor (which carries power along streets) to the individual consumer's terminals or energy meter. It essentially acts as a bridge between the utility supply and the end-user premises.

ЁЯФв Key Formulas

Vconsumer=VdistributorтИТIloadтЛЕRservice_mainV_{consumer} = V_{distributor} - I_{load} \cdot R_{service\_main}VconsumerтАЛ=VdistributorтАЛтИТIloadтАЛтЛЕRservice_mainтАЛ тАФ describes the voltage drop across the service main cable.

тЪЩя╕П Working Principle

The service main is tapped from the distributor line at a pole or underground joint. It feeds current to the consumerтАЩs point of commencement of supply, where the energy meter is installed. This cable is typically designed to handle the specific load current requirements of a single household or commercial building.

ЁЯУМ Key Points
  • тЦ╕

    Service mains are the smallest conductors in the distribution network hierarchy.

  • тЦ╕

    They are connected to the distributor via a service cut-out or fuse.

  • тЦ╕

    The physical length and cross-section are minimized to reduce I2RI^2RI2R losses and voltage drops.

тЬЕ Advantages
  • тЦ╕

    Provides localized control and protection via service cut-outs.

  • тЦ╕

    Easily replaceable compared to main distribution lines.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Vulnerable to environmental damage and physical tampering.

  • тЦ╕

    Cumulative voltage drop can occur if the service main is excessively long.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Domestic electricity connections.

  • тЦ╕

    Commercial shop and office power supply.

ЁЯУД Additional Information
  • тЦ╕

    In underground systems, service mains are often tapped from distribution pillars.

  • тЦ╕

    Option B (Distributor) is the main conductor supplying energy to various service mains. Option C (Feeders) connect the substation to the distributors.

ЁЯУК Diagram / Illustration
DistributorService MainConsumer
тЬЕ

A is correct тАФ The service mains serve as the final connection link from the distribution system to the consumer's premises.

Core Concepts Used
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Power Distribution Hierarchy Voltage Drop Analysis Service Connection
ЁЯТб EXAM TIP

Always remember the order of hierarchy: Substation тЖТ\rightarrowтЖТ Feeder тЖТ\rightarrowтЖТ Distributor тЖТ\rightarrowтЖТ Service Mains.

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