LV switchgear: functions and selection: Difference between revisions

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== General Contents  ==


==== Methodology and definition  ====
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The three basic functions provided by low voltage switchgear for the related electrical circuit are:
* Electrical protection
* Isolation
* Local or remote switching


==== Overcurrent protection principles  ====
This chapter explains these functions, describes the most common types of low voltage protection and/or control switchgear. With a special focus on circuit-breakers: their characteristics, and how to select circuit-breakers, taking into account selectivity and cascading techniques.
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==== Practical values for a protective scheme  ====


==== Location of protective devices  ====
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==== Conductors in parallel  ====
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== [[Practical method for determining the smallest allowable cross-sectional area of circuit conductors|Practical method for determining the smallest allowable cross-sectional area of circuit conductors]]  ==
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==== General  ====
{{Related-guides-intro}}
{{RelatedGuide
|image=Hp-highlight-selectivity-guide.png
|title=Selectivity, Cascading and Coordination Guide
|text=Get all required information to verify your electrical distribution design's robustness, considering overloads and short circuits.


==== General method for cables  ====
Combine the benefits of selectivity and cascading to maximize power availability of your LV design at optimized cost.


==== Recommended simplified approach for cables  ====
Find Schneider Electric's coordination data for ACBs, MCCBs, MCBs, switches, busbar trunking (busways), motor starters and more.
 
|btn-text=Download the guide (.pdf)
==== Busbar trunking systems  ====
|link=https://www.se.com/ww/en/download/document/LVPED318033EN/
 
}}
== [[Determination of voltage drop|Determination of voltage drop]]  ==
 
==== Maximum voltage drop limit  ====
 
==== Calculation of voltage drop in steady load conditions  ====
 
== [[Short-circuit current|Short-circuit current]]  ==
 
==== Short-circuit current at the secondary terminals of a MV/LV distribution transformer  ====
 
==== 3-phase short-circuit current (Isc) at any point within a LV installation  ====
 
==== Isc at the receiving end of a feeder in terms of the Isc at its sending end  ====
 
==== Short-circuit current supplied by an alternator or an inverter  ====
 
== [[Particular cases of short-circuit current|Particular cases of short-circuit current]]  ==
 
==== Calculation of minimum levels of short-circuit current  ====
 
==== Verification of the withstand capabilities of cables under short-circuit conditions  ====
 
== [[Protective earthing conductor|Protective earthing conductor]]  ==
 
==== Connection and choice  ====
 
==== Conductor sizing  ====
 
==== Protective conductor between MV/LV transformer and the main general distribution board (MGDB) ====
 
==== Equipotential conductor  ====
 
== [[The neutral conductor|The neutral conductor]]  ==
 
==== Sizing the neutral conductor  ====
 
==== Protection of the neutral conductor  ====
 
==== Breaking of the neutral conductor  ====
 
==== Isolation of the neutral conductor  ====
 
== [[Worked example of cable calculation|Worked example of cable calculation ]]<br> ==

Latest revision as of 13:46, 26 January 2024

Banner-chapter H.jpg

The three basic functions provided by low voltage switchgear for the related electrical circuit are:

  • Electrical protection
  • Isolation
  • Local or remote switching

This chapter explains these functions, describes the most common types of low voltage protection and/or control switchgear. With a special focus on circuit-breakers: their characteristics, and how to select circuit-breakers, taking into account selectivity and cascading techniques.

Chapter H - Contents


Related technical guides

Download the guide (.pdf)
Selectivity, Cascading and Coordination Guide
Get all required information to verify your electrical distribution design's robustness, considering overloads and short circuits.

Combine the benefits of selectivity and cascading to maximize power availability of your LV design at optimized cost.

Find Schneider Electric's coordination data for ACBs, MCCBs, MCBs, switches, busbar trunking (busways), motor starters and more.
Download the guide (.pdf)
Retrieved from "http://www.electrical-installation.org/enw/index.php?title=LV_switchgear:_functions_and_selection&oldid=28685"
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