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I think you are missing the point.The OP asked if he can use RCBO's
Again, how do you know it is not required with no details of the installation? We have no details of the installation at all, other than it has a TT supply and may have RCBO's, MCB's or a mixture of both.
Without further detail I fail to see how you can state that a time delayed RCD is not required.
Even if this is a simple domestic installation there may be circumstances where a time delayed RCD is required.
It doesn't make any difference not knowing about the installation, it doesn't change the fact that:
The use of a timed delayed RCD is NOT a requirement.
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