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Supplementary Bonding Question
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<blockquote data-quote="apprentice87" data-source="post: 383221" data-attributes="member: 13534"><p>If it is "extraneous" then it needs proper bonding. Supplementary bonding is just that, it is not the same as "proper" bonding.. do the tests Andy told you about to see if they are extraneous first... If they are, then they need proper bonding back to the MET</p><p></p><p>Test between any simultaneously accessable exposed conductive parts too. There should be very little resistance between them as they should all be earthed by means of the supply CPC. In any case, the resistance between them must be such that the max voltage that could appear between then is 50V, This means, that in the case of circuits protected by a 30mA rcd, the resistance between them must be LESS than 1666 ohms.</p><p></p><p>Check between exposed bits or extraneous bits and anything else conductive, if the result is more than about 22 - 25 Kohms forget about them, if less, but NOT less than 1666 ohms, supplementary bond them.</p><p></p><p>john...</p></blockquote><p></p>
[QUOTE="apprentice87, post: 383221, member: 13534"] If it is "extraneous" then it needs proper bonding. Supplementary bonding is just that, it is not the same as "proper" bonding.. do the tests Andy told you about to see if they are extraneous first... If they are, then they need proper bonding back to the MET Test between any simultaneously accessable exposed conductive parts too. There should be very little resistance between them as they should all be earthed by means of the supply CPC. In any case, the resistance between them must be such that the max voltage that could appear between then is 50V, This means, that in the case of circuits protected by a 30mA rcd, the resistance between them must be LESS than 1666 ohms. Check between exposed bits or extraneous bits and anything else conductive, if the result is more than about 22 - 25 Kohms forget about them, if less, but NOT less than 1666 ohms, supplementary bond them. john... [/QUOTE]
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