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VOLTAGE OPERATED ELCB BE842

Former Community Member
Former Community Member
Regarding voltage ELCB's BS842 I am currently looking at replacing an old Wylex fuse board with a new C.U with individual rcbo's system is TT. Question is if I remove the earth connections from this device can it be used as the isolator switch for the new CU?

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    What is the resistance of your earth rod? With six 30mA RCBOs and no overall RCD, your worst case leakage before anything trips could be as much as 180mA. That give you a max permissible earth rod resistance of 277 ohms to keep the touch voltage below 50V under normal circumstances. Ideally, you will want it much less than that. 


    Regards,


    Alan.
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  • 0
    What is the resistance of your earth rod? With six 30mA RCBOs and no overall RCD, your worst case leakage before anything trips could be as much as 180mA. That give you a max permissible earth rod resistance of 277 ohms to keep the touch voltage below 50V under normal circumstances. Ideally, you will want it much less than that. 


    Regards,


    Alan.
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