Scope and objectives
The scope of this electrical installation handbook is to provide the designer and
user of electrical plants with a quick reference, immediate-use working tool. This
is not intended to be a theoretical document, nor a technical catalogue, but, in
addition to the latter, aims to be of help in the correct definition of equipment,
in numerous practical installation situations.
The dimensioning of an electrical plant requires knowledge of different factors
relating to, for example, installation utilities, the electrical conductors and other
components; this knowledge leads the design engineer to consult numerous
documents and technical catalogues. This electrical installation handbook, however, aims to supply, in a single document, tables for the quick definition of the
main parameters of the components of an electrical plant and for the selection
of the protection devices for a wide range of installations. Some application
examples are included to aid comprehension of the selection tables.

范围和目标
本电气安装手册的范围是向设计师和
用户可快速参考电气设备，立即使用工作工具。这
不是一份理论文件，也不是一份技术目录，而是
除后者外，旨在帮助正确定义设备，
在许多实际安装情况下。
电厂的尺寸标注需要了解不同的因素
例如，与安装公用设施、电导体和其他相关的
组件；这一知识会引导设计工程师咨询众多客户
文件和技术目录。然而，本电气安装手册旨在在一份文件中提供表格，用于快速定义
电气设备部件的主要参数和选择
各种装置的保护装置。一些应用程序
包括示例，以帮助理解选择表。