When installing and wiring an explosion-proof distribution box, it is essential to follow strict safety protocols and national electrical standards (e., IEC, NEC, or local safety regulations). Consequently, the installation and maintenance personnel who work on such systems have a spe ial responsibility. It is intended as an enhancement to the appropriate regulations with which. DMI, with over 40 years of expertise, stands out in the field of lifting and handling equipment. We offer a comprehensive range of services, including rental, sales, repair, and maintenance of. Basic concepts and Methodology. Each site will have drawings hat will indicate the extent of the Zones. A. 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. The International Electrotechnical Commission(IEC) was officially founded in 1906, with the aim of securing the international co-operation as regards standardization and certification in electrical and electronic technologies.