L
Loubanez
Hello all,
Perhaps a few of you could help my understanding of the following query.
The situation I am about to describe is purely hypothetical to help my understanding of the issue.
Let's assume within a domestic bathroom, I have a combination of exposed conductive parts and suspect extraneous conductive parts which can be accessible simultaneously, lets also assume the circuits within the bathroom achieve ADS, and are covered by a 30mA RCD, and that main bonding to incoming services has been carried out. I want to check to see if supplementary bonding is required to the suspect extraneous metal pipe.
Am i correct with the following assumptions:
>25000 ohms: is the resistance of the metal pipe to the exposed metal and of that to the MET. conclusion ; the pipe is deemed NOT extraneous and therefore no bonding required.
<1666 ohms: is the resistance of the metal pipe to the exposed metal and of that to the MET. Conclusion ; the pipe IS deemed extranoues, but the resistance is low enough to achieve a speedy disconnection time, so no bonding is required.
>1666<25000 ohms : is the resistance of the metal pipe to exposed metal and if that to the MET. Conclusion ; the pipe IS deemed extraneous and bonding required.
I have also seen the figure 0.05 ohms when referring to supplementary bonding, I'm not quite sure what this refers to. The minimum resistance required once the bonding is in place?
Thanks in advance.
Perhaps a few of you could help my understanding of the following query.
The situation I am about to describe is purely hypothetical to help my understanding of the issue.
Let's assume within a domestic bathroom, I have a combination of exposed conductive parts and suspect extraneous conductive parts which can be accessible simultaneously, lets also assume the circuits within the bathroom achieve ADS, and are covered by a 30mA RCD, and that main bonding to incoming services has been carried out. I want to check to see if supplementary bonding is required to the suspect extraneous metal pipe.
Am i correct with the following assumptions:
>25000 ohms: is the resistance of the metal pipe to the exposed metal and of that to the MET. conclusion ; the pipe is deemed NOT extraneous and therefore no bonding required.
<1666 ohms: is the resistance of the metal pipe to the exposed metal and of that to the MET. Conclusion ; the pipe IS deemed extranoues, but the resistance is low enough to achieve a speedy disconnection time, so no bonding is required.
>1666<25000 ohms : is the resistance of the metal pipe to exposed metal and if that to the MET. Conclusion ; the pipe IS deemed extraneous and bonding required.
I have also seen the figure 0.05 ohms when referring to supplementary bonding, I'm not quite sure what this refers to. The minimum resistance required once the bonding is in place?
Thanks in advance.