1. Choice and use of materials
1.1 External influences
External high-voltage influences include all non-electrical conditions that can affect electrical installations.
The standards distinguish three categories of external influences (NF C 13-200, table 51A).
environments. Designated by the first letter A, they characterize the environment in which the equipment in the electrical installation is located; they determine the characteristics that electrical...
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Choice and use of materials
Operation, testing, servicing and maintenance
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