Hi Robbie,
You are mixing two different fault current paths up here, the 1667 ohms is max Zs , which is for the RCD part (if it is a 30mA device), which is an Earth fault path, which the RCD part takes care of for you.
The overcurrent/Short circuit fault path will be Phase to Phase, or Phase to Neutral, which as long as the OCPD rating (the 25A part) does not exceed the PSCC output capability of the generator, or at the circuit itself , will be fine.
If i am reading the regs right the 1667ohm would be for the rcd part to operate correctly but anything over the 0.72 would fail for over current protection?
You are mixing two different fault current paths up here, the 1667 ohms is max Zs , which is for the RCD part (if it is a 30mA device), which is an Earth fault path, which the RCD part takes care of for you.
The overcurrent/Short circuit fault path will be Phase to Phase, or Phase to Neutral, which as long as the OCPD rating (the 25A part) does not exceed the PSCC output capability of the generator, or at the circuit itself , will be fine.
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