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2. Envelopes
The envelopes of the assemblies must ensure a certain number of protective functions:
protection against electric shock (direct and indirect contact) ;
protection against certain external influences.
2.1 Protection against electric shock
For protection against electric shock, and particularly against direct contact, a distinction must be made between :
open assemblies: on baseplate, frame, chassis ;
enclosed units: boxes, cabinets, desks, switchboards, which can be totally enclosed (by the enclosure and, if necessary, by one or more walls of the premises) or partially enclosed, by barriers...
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Envelopes
Equipment selection and layout
Bibliography
In Engineering Techniques
Regulations – Standardization
Most of the numerous regulations and standards are now of international origin, some of them EEC directives incorporated into French law, others IEC standards adopted as European EN standards. Among the main ones, there has been an artificial separation between what relates to independent switchgear assemblies and what relates to machine safety (the meaning of which is sufficiently broad to blur the boundary),...
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