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The protection classification offered by an enclosure is shown by the letter IP (Ingress Protection) and two digits. The first digit indicates two factors:
? ? ? 1. Protection for persons
? ? ? 2. Protection for equipment
The second digit indicates the protection against water.
First digit: 6 | Protection for persons: | Protection against a wire touching dangerous parts. | Definition: | A body 1,0 mm in diameter must not be able to enter. | ? | Test conditions: | The accessing probe is pushed against every opening of the enclosure with a standardised force or is inserted through the opening. | ? | Conditions for acceptance: | The protection is satisfactory if a sufficient distance between the accessing probe and dangerous parts is kept. | ? | Protection for equipment: | Sealed against dust | ? | Definition: | Dust must not enter at all. | ? | Test conditions: | The test is carried out in a dust chamber in which talcum powder is being kept suspended in the air by means of a dust distributor or similar device. The enclosure which is being tested is placed in the test chamber while a vacuum pump keeps the pressure in the enclosure below the atmospheric pressure of the environment according to the standard. | ? | Conditions for acceptance: | The protection is satisfactory if there is no visible dust deposit within the enclosure after completion of the test. | ? | ? | Second digit: 8 | Protection against water : | Protection against the effects of constant submersion in water. | Definition: | Water must not enter in a quantity that could have harmful effects if the enclosure is kept permanently under water under conditions agreed between the manufacturer and the user; however, these must be more difficult than those under Fig. 7. | ? | Test conditions: | The enclosure is completely immersed in a water basin. The immersion depth as well as the test time are dependent on the conditions agreed on between manufacturer and user. | ? | Conditions for acceptance: | Should water have penetrated, it must not
- be present in quantities which impair the good working order of the operating material or represent a safety hazard;
- deposit on non-conducting parts where it could lead to creep currents;
- come in contact with live parts or coils which are unsuitable for operating in wet conditions;
- collect near the wire end or possibly penetrate the wire. | ? |
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