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{{def|Architecture|choice of a single-line diagram and technological solutions, from connection to the utility network through load power supply circuits.}}

{{def|Main MV/LV distribution| Level upstream of the architecture, from connection to the network utility through to LV distribution equipment on the site (MLVS – or equivalent).}}

{{def| MLVS – Main Low Voltage Switchboard| Main switchboard downstream of the MV/LV transformer, starting point of power distribution circuits in the installation}}

{{def| LV power distribution| intermediate level in the architecture, downstream of the main level through to the sub-distribution switchboards (spatial and functional distribution of electrical power in the circuits).}}

{{def| LV terminal distribution| Downstream level of the architecture, downstream of the sub-distribution switchboards through to the loads. This level of distribution is not dealt with in this guide.}}

{{def|Single-line diagram| general electrical schematic diagram to represent the main electrical equipment and their interconnection.}}

{{def|MV substation, transformation substation| Enclosures grouping together MV equipment and/or MV/LV transformers. These enclosures can be shared or separate, according to the site layout, or the equipment technology. In certain countries, the MV substation is assimilated with the delivery substation.}}

{{def|Technological solution| Resulting from the choice of technology for an installation sub-assembly, from among the different products and equipment proposed by the manufacturer.}}

{{def|Characteristics| Technical or environmental data relative to the installation, enabling the best-suited architecture to be selected.}}

{{def|Criteria| Parameters for assessing the installation, enabling selection of the architecture that is the best-suited to the needs of the customer.}}