Electrical Gems #150 | Page 46

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DVD GAME ALBUM THE CABLE GUY TECH GUIDE Understanding Voltage Drop To ensure satisfactory operation of electrical equipment, it is necessary to maintain the voltage at which it is supplied within certain limits and close to the nameplate rating. We often meet people who do not know what “Voltage Drop” means. An attempt at an easy explanation is: “With a conductor carrying current, the resistance in that conductor causes a drop in the voltage every metre and so the final voltage at the end of the length of conductor is less than at the start of the conductor. If there is more current, there is more voltage drop, if the conductors get hotter there is more resistance and so there is more voltage drop. This means that voltage drop gets worse at full current in a circuit and gets worse as the conductor heats up, and it could be because of the current or because of the ambient getting hotter.” Use of Tabulated mV/A.m Figures The voltage drop (mV/A.m) figures for all sizes of conductors in a variety of cables are given in the AS/ NZS 3008.1.1. They are calculated assuming the cable AVENGERS: ENDGAME OK, so half the heroes died in the last movie thanks to arch-villain Thanos. 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For example, other voltage drop limits may apply in ELV circuits or may be dictated by motor starting considerations. Another example: the voltage drop in mains and submains circuits should take account of the voltage drop in final sub-circuits (and vice versa) to ensure the total voltage drop in the installation is within the required limits. TRUSTED BY AUSTRALIANS FOR OVER 75 YEARS APR – MAY 2019 GEMCELL.COM.AU 47