Common Ingress Protection (IP) Ratings for Electric Motors

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Enclosures of electrical equipment, per characteristics where they will be installed and their maintenance accessibility, should offer a certain degree of Protection also known as Ingress Protection (IP). Standard IEC 60034-5 defines the degrees of protection of electrical equipment by means of the characteristic letters IP, followed by two characteristic numerals. NEMA also defines IP ratings for enclosures. Read IEC Ingress Protection Ratings.  Read also : NEMA Ingress Protection Ratings 

The IEC and NEMA IP ratings are defined for all spectrum of equipment used in an environment where dust, particles, water etc can compromise their performance. However specifically for motors, the standards define the below listed commonly used IP ratings such that there can be no misinterpretation:

Motor
Degree of Protection
First Characteristic Numeral
Second Characteristic Numeral
Protected Against Accidental Contact
Protected Against Solid Objects
Protected Against Water
Open Motors
IP00
Non-Protected Non-Protected Non-Protected
IP02
Non-Protected Non-ProtectedProtected against dripping water even when tilted 15° vertically
IP11
Protection against accidental contact with the hand Ingress of solid objects exceeding 50mm in diameter Protection against dripping water falling vertically
IP12
Protection against accidental contact with the hand Ingress of solid objects exceeding 50mm in diameter Protected against dripping water even when tilted 15° vertically
IP13
Protection against accidental contact with the hand Ingress of solid objects exceeding 50mm in diameter Protected against dripping water even when tilted 60° vertically
IP21
Protection against the touching with the finger Ingress of solid objects exceeding 12mm in diameter
Protection against dripping water falling vertically
IP22
Protection against the touching with the finger Ingress of solid objects exceeding 12mm in diameter Protected against dripping water even when tilted 15° vertically
IP23
Protection against the touching with the finger Ingress of solid objects exceeding 12mm in diameter Protected against dripping water even when tilted 60° vertically
Closed Motors
IP44
Protection against the touching with tools Ingress of solid objects exceeding 1mm in diameter Protection against splashing water from any direction
IP54
Protection against contacts Protection against accumulation of harmful dust Protection against splashing water from any direction
IP55
Protection against touches Protection against accumulation of harmful dust Protection against any water jets from any direction

For special and more dangerous areas where electric motors are required to be applied, the following degrees of protection are commonly used:
IPW 55 (Weather protection)
IP56 (Protections against water jets)
IP65 (Totally protected against dust)
IP66 (Totally protected against dust and water jets).