- Electrical installation guide According to IEC international standards
- General contents General rules of electrical installation
- design Connection to the MV utility distribution network
- Connection to the LV utility distribution network MV & LV architecture selection guide for buildings
- LV Distribution
- Protection against electric shocks and electrical fires
- Sizing and protection of conductors
- LV switchgear: functions & selection
- Overvoltage protection
- Energy efficiency in electrical distribution
- Power Factor Correction
- Harmonic management
- Characteristics of particular sources and loads
- Photovoltaic installations
- Residential premises and other special locations
- EMC guidelines
- Measurement
A - General rules of electrical installation design
Rules and statutory regulationsRange of low-voltage extends from 0 V to 1000 V in a.c. and from 0 V to 1500 V in d.c. One of the first decision is the selection of type of current between the alternative current which corresponds to the most common type of current through out the world and the direct current. Then designers have to select the most appropriate rated voltage within these ranges of voltages. When connected to a LV public network, the type of current and the rated voltage are already selected and imposed by the Utility.Compliance with national regulations is then the second priority of the designers of electrical installation. Regulations may be based on national or international standards such as the IEC 60364 series.Selection of equipment complying with national or international product standards and appropriate verification of the completed installation is a powerful mean for providing a safe installation with the expected quality. Defining and complying with the verification and testing of the electrical installation at its completion as well as periodic time will guarantee the safety and the quality of this installation all along its life cycle. Conformity of equipment according to the appropriate product standards used within the installation is also of prime importance for the level of safety and quality.Environmental conditions will become more and more stringent and will need to be considered at the design stage of the installation. This may include national or regional regulations considering the material used in the equipment as well as the dismantling of the installation at its end of life.
Installed power loads - Characteristics Power loading of an installation
Installed power loads - Characteristics A review of all applications needing to be supplied with electricity is to be done. Any possible extensions or modifications during the whole life of the electrical installation are to be considered. Such a review aimed to estimate the current flowing in each circuit of the installation and the power supplies needed.The total current or 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.)Estimation of the maximum power demand may use various factors depending on the type of application; type of equipment and type of circuits used within the electrical installation.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 is readily obtained.Local information regarding tariff structures is also required to allow the best choice of connection arrangement to the power-supply network, e.g. at medium voltage or low voltage level.
B - Connection to the MV utility distribution network
Connection to the MV public distribution network Where this connection is made at the Medium Voltage level a consumer-type substation will have to be studied, built and equipped. This substation may be an outdoor or indoor installation conforming to relevant standards and regulations (the low-voltage section may be studied separately if necessary). Metering at medium-voltage or low-voltage is possible in this case.
C - Connection to the LV utility distribution network
Where the connection is made at the Low Voltage level the installation will be connected to the local power network and will (necessarily) be metered according to LV tariffs.
D - MV & LV architecture selection guide
The whole electrical system including the MV installation and the LV installation is to be studied as a complete system. The customer expectations and technical parameters will impact the architecture of the system as well as the electrical installation characteristics.Determination of the most suitable architecture of the MV/LV main distribution and LV power distribution level is often the result of optimization and compromise.Neutral earthing arrangements a chosen according to local regulations, constraints related to the power-supply, and to the type of loads
