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Do-It-Yourself (DIY) Question & Answer Forum
Cable Over Current Protection
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<blockquote data-quote="Sidewinder" data-source="post: 188571" data-attributes="member: 9512"><p>Andy,</p><p></p><p>Doubtful you will get an mcb to fit in place of the main fuse it will almost certainly be an mccb.</p><p></p><p>This will need the thermal &amp; magnetic settings adjusting to meet the requirements of the load.</p><p></p><p>It can be allowable to supply from reduced size wiring, I left my brb in the hosue this am, and spent the journey chatting with my chauffer!</p><p></p><p>Only an hour anyway.</p><p></p><p>Is it possible to overload the "tails"? I'll use the term tails from now on to mean the reduced size links to the bus bars.</p><p></p><p>Can they be damaged by short circuit?</p><p></p><p>OK, can any individual circuit fault on the outgoing db overload the tails?</p><p></p><p>What are the chances of 2 simultaneous faults overloading the tails?</p><p></p><p>What is the total load capability of the board, does this overload the tails, please remember that many 125A 3ph boards have diversity of 0.8 or 0.9.</p><p></p><p>Thus what is the maximum steady state current that can be drawn from this board?</p><p></p><p>Will this overload the tails.</p><p></p><p>As Plumber says, discrimination is not "automatic" with mcb/mcb cascading, it is possible, but difficult to work out without suitable software to assist.</p><p></p><p>Next... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> ; ) <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: 188571, member: 9512"] Andy, Doubtful you will get an mcb to fit in place of the main fuse it will almost certainly be an mccb. This will need the thermal & magnetic settings adjusting to meet the requirements of the load. It can be allowable to supply from reduced size wiring, I left my brb in the hosue this am, and spent the journey chatting with my chauffer! Only an hour anyway. Is it possible to overload the "tails"? I'll use the term tails from now on to mean the reduced size links to the bus bars. Can they be damaged by short circuit? OK, can any individual circuit fault on the outgoing db overload the tails? What are the chances of 2 simultaneous faults overloading the tails? What is the total load capability of the board, does this overload the tails, please remember that many 125A 3ph boards have diversity of 0.8 or 0.9. Thus what is the maximum steady state current that can be drawn from this board? Will this overload the tails. As Plumber says, discrimination is not "automatic" with mcb/mcb cascading, it is possible, but difficult to work out without suitable software to assist. Next... ;) ; ) ;) [/QUOTE]
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