1.1. The aim of this Guide is to promote best practice by providing practical advice and guidance for designers, installers, verifers and inspectors where the consumer unit or other main switchgear is being replaced in domestic or similar premises wired in accordance with the Seventeenth edition or earlier versions of the Wiring Regulations. The guidance is intended to protect users and installers against dangerous situations that could arise from the existing installation.
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Best Practice Guide to replace a consumer unit. Issue 3
Replacing a consumer unit in domestic and similar premises guide