Electrical systems cover everything to do with a building's power infrastructure, beyond the one-off call-out of an electrician: designing and executing the installation, mounting distribution boards, running circuits by zone, residual current and overcurrent protection, the earthing electrode, extra-low-voltage systems, technical lighting, and backup supplies. The work is carried out by ANRE-certified electricians, and on completion the installation is verified by measurement — earth electrode resistance, insulation resistance, continuity of the protective conductor — recorded in a test certificate. In existing buildings, the most common job is modernisation: replacing an old fuse board, adding residual current protection, and resizing circuits for today's loads.
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