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Student & Learning Zone - City & Guilds
"Consecutive" Voltage Drops
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<blockquote data-quote="Doc Hudson" data-source="post: 489203" data-attributes="member: 1607"><p>No different in principle to doing a volt drop calculation on a radial circuit with loads distributed along its length -vs- single load a far and of cable. As the calculation is mV/A/m the individual sections will have different volt drops than if it was just a single load at the furthest point. The "source" is the same, but the voltage gradually drops along the circuit, and the load reduces the further along the circuit you go. </p><p></p><p>Consider a 100meter 1.0mm T&amp;E radial, with 5x 100watt loads at 20m intervals. first 20m will carry 500w, second 20m 400w, third 20m 300w, fourth 20m 200w, last 20 100w. Whereas a single 500w load would be 100m carrying the full 500w. If you work it out I think you find the distributed load is below 3% but the single load is above 5%.</p><p></p><p>If one of these hypothetical loads was actual a shed CU splitting off to some other accessories, the basic concept of the calculation hasn't changed. You still have to take into account how much load is being consumed along each section of the circuit.</p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 489203, member: 1607"] No different in principle to doing a volt drop calculation on a radial circuit with loads distributed along its length -vs- single load a far and of cable. As the calculation is mV/A/m the individual sections will have different volt drops than if it was just a single load at the furthest point. The "source" is the same, but the voltage gradually drops along the circuit, and the load reduces the further along the circuit you go. Consider a 100meter 1.0mm T&E radial, with 5x 100watt loads at 20m intervals. first 20m will carry 500w, second 20m 400w, third 20m 300w, fourth 20m 200w, last 20 100w. Whereas a single 500w load would be 100m carrying the full 500w. If you work it out I think you find the distributed load is below 3% but the single load is above 5%. If one of these hypothetical loads was actual a shed CU splitting off to some other accessories, the basic concept of the calculation hasn't changed. You still have to take into account how much load is being consumed along each section of the circuit. Doc H. [/QUOTE]
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"Consecutive" Voltage Drops
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