In addition, a MEIWC may also be issued for the replacement of a device that is not considered ‘like-for-like’, but only in circumstances where the skilled person carrying out the replacement can verify that the replacement device satisfies the requirements of BS 7671, particularly, for the safe disconnection of the circuit under fault conditions.įor example, it may be the case where the observation on an Electrical Installation Condition Report (EICR) identifies that the measured earth fault loop impedance ( Z s) for an existing circuit protected by a Type C circuit-breaker exceeds the maximum value permitted by BS 7671.
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