IP degree is combination from two numerals:
First characteristic numeral - protection against the ingress of solid foreign objects
Second characteristic numeral - protection against the ingress of liquids
（More big of the numeral, the protection is more better)

The first numeral(protection against the ingress of solid objects)
	digit	Protection degree
IP against solid objects	0	No protection
	1	protected against solid foreign objects > 50mm
	2	protected against solid foreign objects >12 mm
	3	protected against solid foreign objects >2.5mm
	4	solid foreign objects >1.0mm
	5	dust protected
	6	dust tight
The first numeral(protection against the ingress of liquids)
	Digit	Protection degree
IP against liquids	0	No protection
	1	liquids vertical dripping
	2	liquids dripping (inclined 15 degrees)
	3	liquids spraying
	4	liquids splashing
	5	liquids jets
	6	Powerful liquids jets
	7	Temporary immersion
	8	Continuous immersion