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Do-It-Yourself (DIY) Question & Answer Forum
Correct way to joint 3 x 30 Amp cables, 30A JB not big enough
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<blockquote data-quote="binky" data-source="post: 531709" data-attributes="member: 490"><p>but they are accessible and not hidden under floorboards.</p><p></p><p>To be frank, I've only ever encountered one burn't out JB, but it had tried to set fire to the joist it was screwed to. The spring loading of Wagos keeps a constant pressure on the cable, and is vibration proof, not that vibration is much of a concern in domestic properties. All screw joints suffer from 'cold plastic flow' of the copper, this is the mechanism whereby the copper effectively stress relives itself and moves away from the point of pressure, ie the screw terminal. If you do the screw terminal up tight enough, it's not an issue, if you don't then it can leave a loose joint. Next time you are terminating a cable under a screw, go back over the screws half an hour later, and see how much they can be retightened. It's the reason EICRs have the bit about checking all terminations are tight in a CU whilst performing an inspection.</p></blockquote><p></p>
[QUOTE="binky, post: 531709, member: 490"] but they are accessible and not hidden under floorboards. To be frank, I've only ever encountered one burn't out JB, but it had tried to set fire to the joist it was screwed to. The spring loading of Wagos keeps a constant pressure on the cable, and is vibration proof, not that vibration is much of a concern in domestic properties. All screw joints suffer from 'cold plastic flow' of the copper, this is the mechanism whereby the copper effectively stress relives itself and moves away from the point of pressure, ie the screw terminal. If you do the screw terminal up tight enough, it's not an issue, if you don't then it can leave a loose joint. Next time you are terminating a cable under a screw, go back over the screws half an hour later, and see how much they can be retightened. It's the reason EICRs have the bit about checking all terminations are tight in a CU whilst performing an inspection. [/QUOTE]
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Correct way to joint 3 x 30 Amp cables, 30A JB not big enough
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