IP Ratings,French standard NFC 20-010,protection against dust, liquids and impacts,

IP Ratings : indicate the degree of protection against dust, liquids and impacts. The IP degrees of protection are defined by the French standard NFC 20-010. To rate a device's degrees of protection, the letters IP are followed by up to three numbers. These numbers are defined as follows:

First Number Protection against solid objects	Second Number Protection against liquids	Third Number Protection against mechanical impacts
No protection	No protection	No protection
Protected against solid objects over 50mm (e.g. accidental touch by hands.)	Protected against vertically falling rain or condensation	Impact 0.225 joule 150g falling from 15cm
Protected against solid objects over 12mm (e.g. fingers)	Protected against direct sprays of water up to 15° from vertical	Impact 0.375 joule 250g falling from 15cm
Protected against solid objects over 2.5mm (tools & wires)	Protected against sprays to 60° from vertical	Impact 0.50 joule 250g falling from 20cm
Protected against solid objects over 1mm (small tools & small wires)	Protected against water sprayed from all directions
Protected against dust (no harmful deposit)	Protected against low pressure jets of water from all directions	Impact 2.00 joule 500g falling from 40cm
Totally protected against dust	Protected from strong jets of water (e.g. for use on ship decks)
	Protected against the effects of immersion between 15cm and 1m	Impact 6.00 joule 1.5kg falling from 40cm
		Impact 20.00 joule 5 kg falling from 40cm