As the designer of an installation, am I allowed to rely on the RCD element of an RCBO to provide for fault protection in order to allow for loop impedance values greater than given in Table 41.3?
Yes, so long as all the other applicable requirements of the 17th Edition (as amended) are met, including those for protection against overload and short circuit.
Regulation number(s)
411.4.4411.4.5411.4.9
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