What is the external influences IEC 60364-5-51 ?

Each condition of external influence is designated by a code comprising a group of two capital letters and a number as follows:

First letter (A, B or C)

The first letter relates to the general category of external influence:

    A = environment
    B = utilisation
    C = construction of buildings

Second letter

The second letter relates to the nature of the external influence.
Number

The number relates to the class within each external influence.
Additional letter (optional)

Used only if the effective protection of persons is greater than that indicated by the first IP digit.

When only the protection of persons is to be specified, the two digits of the IP code are replaced by the X's.

Example: IP XXB.

Example

For example the code AC2 signifies:

A = environment
AC = environment-altitude
AC2 = environment-altitude > 2,000 m













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Elements of the IP Code and their meanings

A brief description of the IP Code elements is given in the following chart (see Fig. E67).