Electrical installation design methodology - Electrical For the best results in electrical installation design it is recommended to read and to use all the chapters of this guide in the order in which they are presented. Rules and statutory regulations . cf chapter General rules of electrical installation design; Range of low-voltage extends from 0 V to 1 000 V in a.c. and from 0 V to 1 500V in d.c. General rules of electrical installation design General rules of electrical installation design: Electrical installation design methodology; Electrical installation rules, standards. Definition of voltage ranges; Electrical regulations and standards; Quality and safety of an electrical installation; Environmental directives; Installed power loads - Characteristics. Induction motors Electrical Installation Guide, IEC Standards | Schneider Written by Schneider Electric's most talented electrical distribution experts, the Electrical Installation Guide is written for professionals who design, install, inspect, and maintain low-voltage electrical installations in compliance with the standards published by the International Electrotechnical Commission (IEC).