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Student & Learning Zone - City & Guilds
Earth Tape As Opposed To Rod
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<blockquote data-quote="Sidewinder" data-source="post: 426638" data-attributes="member: 9512"><p>Apart from pipe is semi-hard, or hard drawn, and tape is annealed and soft.</p><p></p><p>The resistivity of copper increases with the mechanical hardness.</p><p></p><p>Therefore your hard drawn copper pipe would have a higher resistance than the tape to start, then you would be cold working it to flatten it and increasing the resistance again.</p><p></p><p>The next thing is that earth tape is designed to conduct electricity, 22mm copper water pipe is designed to conduct water, a slight difference! <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>You will find that the resistivity of copper water pipe is significantly higher than earth tape in a "virgin" state.</p><p></p><p>Also,what is the wall thickness of 22mm copper tube, much &lt;1.5mm I suspect.</p><p></p><p>Check BS 7430 out as a starting point.</p><p></p><p>You can do this and do it well, and just because you have a TT does not mean you must have RCD's, IF your TT earth is reliable...</p><p></p><p>30m of earth tape, and 3 or more rods is pretty reliable! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="Sidewinder, post: 426638, member: 9512"] Apart from pipe is semi-hard, or hard drawn, and tape is annealed and soft. The resistivity of copper increases with the mechanical hardness. Therefore your hard drawn copper pipe would have a higher resistance than the tape to start, then you would be cold working it to flatten it and increasing the resistance again. The next thing is that earth tape is designed to conduct electricity, 22mm copper water pipe is designed to conduct water, a slight difference! ;) You will find that the resistivity of copper water pipe is significantly higher than earth tape in a "virgin" state. Also,what is the wall thickness of 22mm copper tube, much <1.5mm I suspect. Check BS 7430 out as a starting point. You can do this and do it well, and just because you have a TT does not mean you must have RCD's, IF your TT earth is reliable... 30m of earth tape, and 3 or more rods is pretty reliable! ;) [/QUOTE]
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Earth Tape As Opposed To Rod
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