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Ring Final

wessex
With reference to 433.1.204 and cable as installed has min capacity of 20A if protected by a 30A or 32A. If the protective device is reduced to 20A how is the new minimum as installed capacity calculated or arrived at ? I've been looking in the Electrical Installation Design Guide, but the answer is avoiding my eyes.
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    That seems reasonable. Thanks for that. I do not see the reasoning behind the circuit, but never the less trying to validate it.

    Thanks all for the feedback.
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    That seems reasonable. Thanks for that. I do not see the reasoning behind the circuit, but never the less trying to validate it.

    Thanks all for the feedback.
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