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Do-It-Yourself (DIY) Question & Answer Forum
16mm twin and earth
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<blockquote data-quote="Bclearnersparks" data-source="post: 72516" data-attributes="member: 322"><p>Hi Danny7299</p><p></p><p>If you are not sure if cpc is large enough for your install, then you can use adiabatic equation to check this</p><p></p><p>S= square root of I2 * t divided by k</p><p></p><p>s=nominal cross sectional area of cpc mm2</p><p></p><p>I = fault current needed to operate protective device</p><p></p><p>t= time in seconds for protective device to operate</p><p></p><p>K = factor of 115 for copper.</p><p></p><p>If you dont have regs book, let me know what protective device is (type and rating) and I will try and do calculation.</p></blockquote><p></p>
[QUOTE="Bclearnersparks, post: 72516, member: 322"] Hi Danny7299 If you are not sure if cpc is large enough for your install, then you can use adiabatic equation to check this S= square root of I2 * t divided by k s=nominal cross sectional area of cpc mm2 I = fault current needed to operate protective device t= time in seconds for protective device to operate K = factor of 115 for copper. If you dont have regs book, let me know what protective device is (type and rating) and I will try and do calculation. [/QUOTE]
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16mm twin and earth
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