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Popups-assisted disambiguation from CM to Metre#SI multiples |
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For example, an electrical socket rated IP22 is protected against insertion of fingers and will not be damaged or become unsafe when exposed to vertically or nearly vertically dripping water. IP22 or IP2X are typical minimum requirements for the design of electrical accessories for in-door use.
One source reports that the Australian national standard AS 1939 adds to the international standard a third optional digit, which indicates protection against mechanical impact damage. It ranges from 0 for no protection to 9 for protection against 20 [[joule]] impacts (equivalent to 5 [[kg]] dropped from 40 [[Metre#SI multiples|cm]]).
==First digit==
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