Schneider Electric - Electrical installation guide 2009
A
© Schneider Electric - all rights reserved
Chapter A
General rules of electrical
installation design
Contents
Methodology
A2
Rules and statutory regulations
A4
2.1 Definition of voltage ranges
A4
2.2 Regulations
A5
2.3 Standards
A5
2.4 Quality and safety of an electrical installation
A6
2.5 Initial testing of an installation
A6
2.6 Periodic check-testing of an installation
A7
2.7 Conformity (with standards and specifications) of equipment
used in the installation
A7
2.8 Environment
A8
Installed power loads - Characteristics
A0
3.1 Induction motors
A10
3.2 Resistive-type heating appliances and incandescent lamps
(conventional or halogen)
A12
Power loading of an installation
A5
4.1 Installed power (kW)
A15
4.2 Installed apparent power (kVA)
A15
4.3 Estimation of actual maximum kVA demand
A16
4.4 Example of application of factors ku and ks
A17
4.5 Diversity factor
A18
4.6 Choice of transformer rating
A19
4.7 Choice of power-supply sources
A20
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Schneider Electric - Electrical installation guide 2009
A - General rules of electrical installation design
A2
© Schneider Electric - all rights reserved
For the best results in electrical installation design it is recommended to read all the
chapters of this guide in the order in which they are presented.
Listing of power demands
The study of a proposed electrical installation requires an adequate understanding of
all governing rules and regulations.
The total power demand can be calculated from the data relative to the location and
power of each load, together with the knowledge of the operating modes (steady
state demand, starting conditions, non simultaneous operation, etc.)
From these data, the power required from the supply source and (where appropriate)
the number of sources necessary for an adequate supply to the installation are
readily obtained.
Local information regarding tariff structures is also re