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Posted to uk.d-i-y
Andy Wade
 
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Default Equipotential bonding in bathroom

wrote:

4mm2 insulated,


Correct.

or 6mm2 bare.

Wrong. Bare protective conductors, whether circuit protective
conductors or equipotential bonding conductors, are not permitted for
sizes of less than 10 mm^2. [See regulation 543-03-02]

--
Andy