You wire a consumer unit by fixing the live cable into the top of an MCB. The neutral cable is screwed into the RCD neutral terminal block. The earth cable will then be fed into the consumer unit and wired up to the appropriate MCB.
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BS-7671 Standard
You wire a consumer unit by fixing the live cable into the top of an MCB. The neutral cable is screwed into the RCD neutral terminal block. The earth cable will then be fed into the consumer unit and wired up to the appropriate MCB.