Sizing and protection of conductors: Difference between revisions

Latest revision as of 13:46, 26 January 2024

Selection of cross-sectional-areas of cables is certainly one of the most important tasks of the design process of an electrical installation as this greatly influences:

the selection of overcurrent protective devices,
the voltage drop along these conductors
and the estimation of the prospective short-circuit currents

This chapters details the different steps and methodologies for conductor sizing. And the specific recommendations for neutral and Protective Earth (PE) conductors sizing.

Chapter G - Contents

External links

Electrical design software

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-{{Menu Index}} __NOTOC__
+<!-------------------------------------------------------------------------------------------------------------------------
+----            define HERE the LETTER of this chapter (A...S). It is then used in different places further below, in this page
+-------------------------v-------------------------------------------------------------------------------------------------
+---->{{#vardefine:letter|G}}<!--
-== [[General Contents|General Contents]] ==
-==== Methodology and definition  ====
+--><div class="chapter-banner">[[File:Banner-chapter_{{#var:letter}}.jpg|class=chapter-banner-img|link=]]</div>
+{{Highlightbox|text=
+<!-----------------------------------------------------------------------------------------------------------------------------
+---- Description text for this chapter - START
+------------------------------------------------------------------------------------------------------------------------------>
+Selection of cross-sectional-areas of cables is certainly one of the most important tasks of the design process of an electrical installation as this greatly influences:
+* the selection of overcurrent protective devices,
+* the voltage drop along these conductors
+* and the estimation of the prospective short-circuit currents
+This chapters details the different steps and methodologies for conductor sizing. And the specific recommendations for neutral and Protective Earth (PE) conductors sizing.
+<!-----------------------------------------------------------------------------------------------------------------------------
+---- Description text for this chapter - END
+------------------------------------------------------------------------------------------------------------------------------>
+}}
+<!--
-==== Overcurrent protection principles  ====
-==== Practical values for a protective scheme  ====
+--><!-----------------------------------------------------------------------------------
+---add chapter TOC, based on Hierarchy (DO NOT MODIFY!)
+----------------------------------------------------------------------------------------
+-->{{ch-toc|letter={{#var:letter}}}}
-==== Location of protective devices  ====
+<!-- -----------------------------------------------------------------------------------
+---- define all properties and categories for this chapter landing page (DO NOT MODIFY!)
+----------------------------------------------------------------------------------------
+-->__NOTOC__ __NOEDITSECTION__<!--
+-->[[Has chapter letter::{{#var:letter}}| ]]<!--
+-->{{#isin:{{MediaWiki:mainpage}}}}<!--
+-->[[Category:eig-ch-landing-pages]]<!--
+-->{{ch-category|{{#var:letter}}}}<!--
+--><div>{{#addbodyclass:Chapter-TOC}}</div><!--
+--><!-- ------------------------------------------------------------------------------->
-==== Conductors in parallel  ====
+==External links==
+*[https://www.se.com/ww/en/product-category/26426075-energy-management-software-solutions/?filter=business-4-low-voltage-products-and-systems Electrical design software]
-== [[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]]<br> ==
+<!-- ----------------------------------------------------------------------------------------
+---- ADD BELOW external links, inter-language links, and possibly other related content links
-==== General  ====
+-------------------------------------------------------------------------------------------->
-==== General method for cables  ====
-==== Recommended simplified approach for cables  ====
-==== Busbar trunking systems ====
-== [[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<br> ====
-== [[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]] ==

Sizing and protection of conductors: Difference between revisions

Latest revision as of 13:46, 26 January 2024

Chapter G - Contents

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