Schneider Electric - Electrical installation guide 2009
P
© Schneider Electric - all rights reserved
Chapter P
Residential and other special
locations
Contents
Residential and similar premises
P2
1.1 General
P2
1.2 Distribution boards components
P2
1.3 Protection of people
P4
1.4 Circuits
P6
1.5 Protection against overvoltages and lightning
P7
Bathrooms and showers
P8
2.1 Classification of zones
P8
2.2 Equipotential bonding
P11
2.3 Requirements prescribed for each zone
P11
Recommendations applicable to special installations
P2
and locations
3
2
Schneider Electric - Electrical installation guide 2009
P - Residential and other special locations
P2
© Schneider Electric - all rights reserved
. General
Related standards
Most countries have national regulations and-or standards governing the rules
to be strictly observed in the design and realization of electrical installations for
residential and similar premises. The relevant international standard is the publication
IEC 60364.
The power network
The vast majority of power distribution utilities connect the low voltage neutral point
of their MV/LV distribution transformers to earth.
The protection of persons against electric shock therefore depends, in such case, on
the principle discussed in chapter F. The measures required depend on whether the
TT, TN or IT scheme of earthing is adopted.
RCDs are essential for TT and IT earthed installations. For TN installations, high
speed overcurrent devices or RCDs may provide protection against direct contact
of the electrical circuits. To extend the protection to flexible leads beyond the fixed
socket outlets and to ensure protection against fires of electrical origin RCDs shall
be installed.
.2 Distribution boards components (see Fig. P)
Distribution boards (generally only one in residential premises) usually include
the meter(s) and in some cases (notably where the supply utilities impose a TT
earthing system and/or tariff conditions which limit the