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Do-It-Yourself (DIY) Question & Answer Forum
Sizing a Circuit Breaker
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 556770" data-attributes="member: 250"><p>The volt drop down the cable will be approx 0.51V. which is ref the connected load e.g. the 50W anti condensation heater.</p><p>(18mv/A/m x 0.22A x 130m) / 1000 </p><p></p><p>And as the op says this is the only thing to be connected to the cable.. you would never be drawing 4.7amps?</p><p>Plus the MCB is there to protect the cable.. Not limit the volt drop. </p><p></p><p>If volt drop is an issue, you don't decrease the MCB rating, you increase the cable CSA.</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 556770, member: 250"] The volt drop down the cable will be approx 0.51V. which is ref the connected load e.g. the 50W anti condensation heater. (18mv/A/m x 0.22A x 130m) / 1000 And as the op says this is the only thing to be connected to the cable.. you would never be drawing 4.7amps? Plus the MCB is there to protect the cable.. Not limit the volt drop. If volt drop is an issue, you don't decrease the MCB rating, you increase the cable CSA. [/QUOTE]
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Sizing a Circuit Breaker
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