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My war against dual rcd boards

Newfutile
As each (RCD) Residual Current Device must not have more than 30% leakage current on it.
It's hard to see how dual (RCD) Residual Current Device boards can be fitted at all these days.
i come across so many dual rcd boards with solar, evse and heat pumps on them, these have all been recently installed.
i wonder if BS7671 should state: Dual (RCD) Residual Current Device boards shall not be fitted, unless it can be shown (and documented) that they are suitable for the combined leakage currents expected .
otherwise developers will keep specifying them and i will have keep educating them on the many reasons a type A rcd should not be shared with other equipment!.
maybe manuafactuers instructions should also state : not suitable for a shared rcd, for certain equipment.
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  • Newfutile said:
    i come across so many dual rcd boards with solar, evse and heat pumps on them, these have all been recently installed.

    For solar PV, I wonder if the installs actually comply with the manufacturer's instructions and the Wiring Regulations because when I was looking at solar inverters for a home installation, virtually all of the installation manuals from lots of manufacturers flagged up that the inverters had high leakage currents and should not be connected to regular 30mA RCDs, they needed 100mA or 300mA RCDs, or no RCD because of the leakage.

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  • Newfutile said:
    i come across so many dual rcd boards with solar, evse and heat pumps on them, these have all been recently installed.

    For solar PV, I wonder if the installs actually comply with the manufacturer's instructions and the Wiring Regulations because when I was looking at solar inverters for a home installation, virtually all of the installation manuals from lots of manufacturers flagged up that the inverters had high leakage currents and should not be connected to regular 30mA RCDs, they needed 100mA or 300mA RCDs, or no RCD because of the leakage.

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