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Following On From The Compliant Thread Poll
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<blockquote data-quote="Brian 157" data-source="post: 147714" data-attributes="member: 2251"><p>The type of cable and installation method aren't specified but if we take it to be 2.5 6242YH (twin &amp; earth) the cable is rated between 18.5 &amp; 30 amps and last time I checked 13 was less than 18.5 so yes, a 13A fuse is adequate protection.</p><p></p><p>I assume (dangerous, I know) that in the scenario of the original posting we're talking about a 13A BS1362 in a fused spur fusing down a cable otherwise protected by a higher rated device (such as a spur from a ring), in which case if we get a Zs measurement below 1.94 ohms (table 41.2 value 2.42ohms, rule of thumb applied giving 1.94) we're meeting 0.4s disconnection time.</p></blockquote><p></p>
[QUOTE="Brian 157, post: 147714, member: 2251"] The type of cable and installation method aren't specified but if we take it to be 2.5 6242YH (twin & earth) the cable is rated between 18.5 & 30 amps and last time I checked 13 was less than 18.5 so yes, a 13A fuse is adequate protection. I assume (dangerous, I know) that in the scenario of the original posting we're talking about a 13A BS1362 in a fused spur fusing down a cable otherwise protected by a higher rated device (such as a spur from a ring), in which case if we get a Zs measurement below 1.94 ohms (table 41.2 value 2.42ohms, rule of thumb applied giving 1.94) we're meeting 0.4s disconnection time. [/QUOTE]
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