Answer / ik3232

IP-43 Rating - The first digit designation "4" means
protection against "solid objects equal or greater than 1mm
(0.04") in diameter". The second digit "3" means protection
against "sprayed water" ; "Spray water falling
perpendicularly at an angle of up to 60-deg may not have any
damaging effects".

If u want More Details,then :
http://en.wikipedia.org/wiki/IP_Code#cite_note-0

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