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Do-It-Yourself (DIY) Question & Answer Forum
Armoured Cable Capacity
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<blockquote data-quote="Sidewinder" data-source="post: 392569" data-attributes="member: 9512"><p>Yes, sorry engineman, you have been somewhat forgotten!</p><p></p><p>We are all nuts on here, well many of us anyway.</p><p></p><p>35mm sq will be OK for current as Apprentice says.</p><p></p><p>As you are intending to draw the full power at the far end, then the voltage drop will be above that allowed under BS7671.</p><p></p><p>This will not really be an issue as it is only just outside limits, and there are ways to show it's OK, with some clever maths.</p><p></p><p>However, it's irrelevant for your use, plus the more energy the cable dissipates (within reason) the less the load banks have to! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>Are you planning to run this for minutes, hours or days at a time.</p><p></p><p>The reason I ask is that the cable will reach a thermal equilibrium, and we need to ensure that it does this within the limits of the cable to save you melting it</p><p></p><p>You need to be careful with the terminations because the Joule heating across a high resistance connection @ 100A will quickly cause deterioration.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 392569, member: 9512"] Yes, sorry engineman, you have been somewhat forgotten! We are all nuts on here, well many of us anyway. 35mm sq will be OK for current as Apprentice says. As you are intending to draw the full power at the far end, then the voltage drop will be above that allowed under BS7671. This will not really be an issue as it is only just outside limits, and there are ways to show it's OK, with some clever maths. However, it's irrelevant for your use, plus the more energy the cable dissipates (within reason) the less the load banks have to! ;) Are you planning to run this for minutes, hours or days at a time. The reason I ask is that the cable will reach a thermal equilibrium, and we need to ensure that it does this within the limits of the cable to save you melting it You need to be careful with the terminations because the Joule heating across a high resistance connection @ 100A will quickly cause deterioration. [/QUOTE]
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