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Other Considerations
There are additional Regulations and Codes of Practice that
need to be considered during the design of an installation.
These will affect the choice of consumer unit.
Division of Installation
Section 314 calls for the installation to be so divided to:
a. Avoid hazards and minimize inconvenience in the event of
a fault.
b. Reduce the possibility of unwanted tripping of the RCD
due to excessive protective conductor currents.
To comply with these requirements the circuits of an
installation should not be connected to a single RCD, as this
could lead to loss of supply to the entire installation in the
event of a fault on one circuit, clearly inconvenient for the user
of the building.
Guide to
| 17th Edition Consumer Units
11
“All circuits of an installation should not
be connected to a single RCD”