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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 IEE Wiring Regulations and Building
Regulations and how they affect Type B MCB distribution
boards 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.