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External influences shall be taken into account when choosing:
*The appropriate measures to ensure the safety of persons (in particular in special locations or electrical installations)
*The characteristics of electrical equipment, such as degree of protection (IP), mechanical withstand (IK), etc.

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Every electrical installation occupies an environment that presents a variable degree of risk:
*For people
*For the equipment constituting the installation

Consequently, environmental conditions influence the definition and choice of appropriate installation equipment and the choice of protective measures for the safety of persons.<br>The environmental conditions are referred to collectively as “external influences”.<br>Many national standards concerned with external influences include a classification scheme which is based on, or which closely resembles, that of international standard IEC 60364-5-51.<br><br>

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