Schneider Electric - Electrical installation guide 2009
C
© Schneider Electric - all rights reserved
Chapter C
Connection to the LV utility
distribution network
Contents
Low-voltage utility distribution networks
C2
1.1 Low-voltage consumers
C2
1.2 Low-voltage distribution networks
C10
1.3 The consumer service connection
C11
1.4 Quality of supply voltage
C15
Tariffs and metering
C6
2
Schneider Electric - Electrical installation guide 2009
C - Connecion to the LV public
distribution network
C2
© Schneider Electric - all rights reserved
. Low-voltage consumers
In Europe, the transition period on the voltage tolerance to “230V/400V + 10% / - 10%”
has been extended for another 5 years up to the year 2008.
Low-voltage consumers are, by definition, those consumers whose loads can be
satisfactorily supplied from the low-voltage system in their locality.
The voltage of the local LV network may be 120/208 V or 240/415 V, i.e. the lower
or upper extremes of the most common 3-phase levels in general use, or at some
intermediate level, as shown in Figure C.
An international voltage standard for 3-phase 4-wire LV systems is recommended
by the IEC 60038 to be 230/400 V.
Loads up to 250 kVA can be supplied at LV, but power-supply organizations
generally propose a MV service at load levels for which their LV networks are
marginally adequate.
Low-voltage utility distribution
networks
The most-common LV supplies are within the
range 120 V single phase to 240/415 V
3-phase 4-wires.
Loads up to 250 kVA can be supplied at LV, but
power-supply organizations generally propose
a MV service at load levels for which their
LV networks are marginally adequate.
An international voltage standard for 3-phase
4-wire LV systems is recommended by the
IEC 60038 to be 230/400 V
Fig. C1 : Voltage of local LV network and their associated circuit diagrams (continued on next page)
Country
Frequency & tolerance Domestic (V)
Commercial (V)
Industrial (V)
(Hz & %)
Afghanistan
50
38