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RCBO problem
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<blockquote data-quote="PC Electrics" data-source="post: 32624" data-attributes="member: 650"><p>I've never had any problems with my Megger 1552 tripping either RCDs or RCBOs. However, I have recently come across a number of faulty (new) Crabtree RCDs and RCBOs:</p><p></p><p>* won't switch back on after being tripped unless tapped or left a while</p><p></p><p>* won't trip when button pressed</p><p></p><p>* random tripping on a perfect circuit</p><p></p><p>* failing the standard tests - usually at 5x</p><p></p><p>* very low ramp figure (less than 15mA).</p><p></p><p>I think the problems are mostly to do with the internal mechanics and I only use Crabtree now where there is no choice because the existing board is Crabtree. Otherwise I won't touch them.</p><p></p><p>Consider the possibility the RCBOs are faulty - try a ramp test.</p></blockquote><p></p>
[QUOTE="PC Electrics, post: 32624, member: 650"] I've never had any problems with my Megger 1552 tripping either RCDs or RCBOs. However, I have recently come across a number of faulty (new) Crabtree RCDs and RCBOs: * won't switch back on after being tripped unless tapped or left a while * won't trip when button pressed * random tripping on a perfect circuit * failing the standard tests - usually at 5x * very low ramp figure (less than 15mA). I think the problems are mostly to do with the internal mechanics and I only use Crabtree now where there is no choice because the existing board is Crabtree. Otherwise I won't touch them. Consider the possibility the RCBOs are faulty - try a ramp test. [/QUOTE]
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