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Introduction
The whole nature of electrical sub and final distribution for commercial installations has
changed in the last few years. There is a demand for more RCD protection of final circuits,
more metering and often more control to meet energy saving targets.
This guide expands upon some of the requirements found in the 17
th
Edition of the IET Wiring Regulations and the Building
Regulations and how they affect Panelboards and their protective devices.
You should be aware that this guide does not ensure compliance with BS 7671 or the building regulations. You should always
consult the relevant regulations to ensure compliance