Sizing and protection of conductors: Difference between revisions
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Recommended simplified approach for cables | Recommended simplified approach for cables | ||
Busbar trunking systems | [[Busbar trunking systems|Busbar trunking systems]] | ||
=== [[Determination of voltage drop|Determination of voltage drop]] === | === [[Determination of voltage drop|Determination of voltage drop]] === | ||
Maximum voltage drop limit | [[Maximum voltage drop limit|Maximum voltage drop limit]] | ||
Calculation of voltage drop in steady load conditions | [[Calculation of voltage drop in steady load conditions|Calculation of voltage drop in steady load conditions]] | ||
=== [[Short-circuit current|Short-circuit current]] === | === [[Short-circuit current|Short-circuit current]] === | ||
Short-circuit current at the secondary terminals of a MV/LV distribution transformer | [[Short-circuit current at the secondary terminals of a MV/LV distribution transformer|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 | [[3-phase short-circuit current (Isc) at any point within a LV installation|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 | [[Isc at the receiving end of a feeder in terms of the Isc at its sending end|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 | Short-circuit current supplied by an alternator or an inverter | ||
=== | === Particular cases of short-circuit current === | ||
Calculation of minimum levels of short-circuit current | [[Calculation of minimum levels of short-circuit current|Calculation of minimum levels of short-circuit current]] | ||
Verification of the withstand capabilities of cables under short-circuit conditions<br> | [[Verification of the withstand capabilities of cables under short-circuit conditions|Verification of the withstand capabilities of cables under short-circuit conditions]]<br> | ||
=== [[Protective earthing conductor|Protective earthing conductor]] === | === [[Protective earthing conductor|Protective earthing conductor]] === | ||
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Conductor sizing | Conductor sizing | ||
Protective conductor between MV/LV transformer and the main general distribution board (MGDB) | [[Protective conductor between MV/LV transformer and the main general distribution board (MGDB)|Protective conductor between MV/LV transformer and the main general distribution board (MGDB)]] | ||
Equipotential conductor | [[Equipotential conductor|Equipotential conductor]] | ||
=== | === The neutral conductor === | ||
Sizing the neutral conductor | [[Sizing the neutral conductor|Sizing the neutral conductor]] | ||
Protection of the neutral conductor | [[Protection of the neutral conductor|rotection of the neutral conductor]] | ||
Breaking of the neutral conductor | [[Breaking of the neutral conductor|Breaking of the neutral conductor]] | ||
Isolation of the neutral conductor | [[Isolation of the neutral conductor|Isolation of the neutral conductor]] | ||
=== [[Worked example of cable calculation|Worked example of cable calculation]] === | === [[Worked example of cable calculation|Worked example of cable calculation]] === | ||
Revision as of 11:15, 2 February 2011
Conductor sizing and protection
Overcurrent protection principles
Practical values for a protective scheme
Location of protective devices
Practical method for determining the smallest allowable cross-sectional area of circuit conductors
General
General method for cables
Recommended simplified approach for cables
Determination of voltage drop
Calculation of voltage drop in steady load conditions
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
Calculation of minimum levels of short-circuit current
Verification of the withstand capabilities of cables under short-circuit conditions
Protective earthing conductor
Connection and choice
Conductor sizing
Protective conductor between MV/LV transformer and the main general distribution board (MGDB)
The neutral conductor
rotection of the neutral conductor
Breaking of the neutral conductor
Isolation of the neutral conductor
Worked example of cable calculation
Downloads
2010 edition in English: G-Sizing and protection of conductors
2010 edition in French:
G-La protection des circuits 1
G-La protection des circuits 2
