Schneider Electric - Electrical installation guide 2009
N
© Schneider Electric - all rights reserved
Chapter N
Characteristics of particular
sources and loads
Contents
Protection of a LV generator set
N2
and the downstream circuits
1.1 Generator protection
N2
1.2 Downstream LV network protection
N5
1.3 The monitoring functions
N5
1.4 Generator Set parallel-connection
N10
Uninterruptible Power Supply units (UPS)
N
2.1 Availability and quality of electrical power
N11
2.2 Types of static UPSs
N12
2.3 Batteries
N15
2.4 System earthing arrangements for installations comprising UPSs N16
2.5 Choice of protection schemes
N18
2.6 Installation, connection and sizing of cables
N20
2.7 The UPSs and their environment
N22
2.8 Complementary equipment
N22
Protection of LV/LV transformers
N24
3.1 Transformer-energizing inrush current
N24
3.2 Protection for the supply circuit of a LV/LV transformer
N24
3.3 Typical electrical characteristics of LV/LV 50 Hz transformers
N25
3.4 Protection of LV/LV transformers, using Merlin Gerin
circuit-breakers
N25
Lighting circuits
N27
4.1 The different lamp technologies
N27
4.2 Electrical characteristics of lamps
N29
4.3 Constraints related to lighting devices and recommendations
N34
4.4 Lighting of public areas
N42
Asynchronous motors
N45
5.1 Functions for the motor circuit
N45
5.2 Standards
N47
5.3 Applications
N49
5.4 Maximum rating of motors installed for consumers supplied at LV N54
5.5 Reactive-energy compensation (power-factor correction)
N54
5
4
3
2
Schneider Electric - Electrical installation guide 2009
N - Characteristics of particular sources and loads
N2
© Schneider Electric - all rights reserved
Protection of a LV generator set
and the downstream circuits
Most industrial and large commercial electrical installations include certain important
loads for which a power supply must be maintained, in the event that the utility
electrical supply f