Sizing and protection of conductors: Difference between revisions
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== [[General|General | == [[General Contents|General Contents]] == | ||
==== | ==== Methodology and definition ==== | ||
==== | ==== Overcurrent protection principles ==== | ||
==== | ==== Practical values for a protective scheme ==== | ||
== | ==== Location of protective devices ==== | ||
==== | ==== Conductors in parallel ==== | ||
== | == [[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> == | ||
== | ==== 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 | ==== 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]] == | ||
