Bathroom Bonding
- Thread starter jaguar1
- Start date
- Joined
- 19 Jan 2005
- Messages
- 1,171
- Reaction score
- 41
- Country
If all circuits in the bathroom are protected by 30mA rcd and main bonding in place, then no
Sounds like a 17th edition question 
I take it you mean a 6A MCB with a 30mA RCD (RCBO).
Do you have an electric shower? Is this on a 30mA RCD also? Any other circuits entering the bathroom?
The 17th edition allows the exclusion of supplementary bonding under the following conditions:
i)All the final circuits within of the location meet the requirements for automatic disconnection.
ii)All the final circuits of the location are RCD protected.
iii)All extraneous conductive parts of the location are effectively connected to the protective equipotential bonding.
How you go about the iii) isn't over clear, the red book refers to applying reg 415.2.2 which is basically the 50v rule. As main bonding is sized to relate to the supply, (the max resistance of a MEB is generally 0.05 ohms) I would take the maximum resistance between extraneous conductive parts within the location to be the same i.e. 0.05 ohms, though I am not 100% sure on this one!!
I take it you mean a 6A MCB with a 30mA RCD (RCBO).
Do you have an electric shower? Is this on a 30mA RCD also? Any other circuits entering the bathroom?
The 17th edition allows the exclusion of supplementary bonding under the following conditions:
i)All the final circuits within of the location meet the requirements for automatic disconnection.
ii)All the final circuits of the location are RCD protected.
iii)All extraneous conductive parts of the location are effectively connected to the protective equipotential bonding.
How you go about the iii) isn't over clear, the red book refers to applying reg 415.2.2 which is basically the 50v rule. As main bonding is sized to relate to the supply, (the max resistance of a MEB is generally 0.05 ohms) I would take the maximum resistance between extraneous conductive parts within the location to be the same i.e. 0.05 ohms, though I am not 100% sure on this one!!
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
