IP Explanation and Ratings
EN 60529 outlines an international
classification system for the sealing effectiveness of enclosures of electrical
equipment against the intrusion into the equipment of foreign bodies (i.e.
tools, dust, fingers) and moisture. This classification system utilizes the
letters "IP" ("Ingress Protection") followed by two or three digits. (A third
digit is sometimes used. An "x" is used for one of the digits if there is only
one class of protection; i.e. IPX4 which addresses moisture resistance only.)
Degrees of Protection - First Digit
The first digit of the IP code indicates the degree that persons are protected
against contact with moving parts (other than smooth rotating shafts, etc.) and
the degree that equipment is protected against solid foreign bodies intruding
into an enclosure.
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0 |
No special protection
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1 |
Protection from a large part of the body such as a hand (but no
protection from deliberate access); from solid objects greater than
50mm in diameter.
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2 |
Protection against fingers or other object not greater than 80mm in
length and 12mm in diameter.
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3 |
Protection from entry by tools, wires, etc., with a diameter of
thickness greater than 1.0mm.
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4 |
Protection from entry by solid objects with a diameter or thickness
greater than 1.0mm
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5 |
Protection from the amount of dust that would interfere with the
operation of the equipment.
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6 |
Dust tight.
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Degrees of Protection - Second Digit
The second digit indicates the degree of protection of the equipment inside the
enclosure against the harmful entry of various forms of moisture (e.g. dripping,
spraying, submersion, etc.)
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0 |
No special protection
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1 |
Protection from dripping water.
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2 |
Protection from vertically dripping water.
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3 |
Protection from sprayed water.
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4 |
Protection from splashed water.
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5 |
Protection from water projected from a nozzle
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6 |
Protection against heavy seas, or powerful jets of water.
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7 |
Protection against immersion.
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8 |
Protection against complete, continuous submersion in water. |
Submersion depth and time must be
specified by the end-user. The requirement must be more onerous than IP67
The IP Code Symbols
The chart at the right illustrates the use of special symbols in the
IP classification system. In the "1st digit" column, not the grid-like
symbols net to numbers 5 and 6. In the "2nd digit" column numbers 3-8
are symbolised by teardrop shaped symbols, sometimes enclosed in a box
or a triangle, sometimes unenclosed (#7-8). These symbols can be
placed on equipment to illustrate the IP protection provided.
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