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3. Equipment selection and layout
3.1 Choice of equipment
The components (equipment, sub-assemblies) must comply with the corresponding standards and be suitable for their particular application in terms of the external appearance of the assembly (e.g. open or enclosed), and their electrical and mechanical characteristics.
Some of these characteristics may be affected by their incorporation into an assembly; this is notably the case for fuses, contactors and switches, which may be subject to derating (reduction in their rated current), taking into account the conditions of proximity with other equipment and the internal temperature of the assembly in operation.
The maximum permissible currents of certain devices must also be coordinated with the characteristics of upstream...
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Equipment selection and layout
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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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