IP protection grades consist of two numbers. Which levels of protection do they describe and what is the best protection?

Question

Options

• AFirst digit; protections against the ingress of solid objects. Second digit; protection against ingress
• BFirst digit; protections against the ingress of solid objects. Second digit; protection against ingress
• CFirst digit; protections against the ingress of water/fluids. Second digit; protection against ingress
• DFirst digit; protections against the ingress of water/fluids. Second digit; protection against ingress

• B
  90% (26)
• C
  7% (2)
• D
  3% (1)

Explanation

IP protection grades are a way of showing the effectiveness of electrical enclosures in blocking foreign bodies such as dust, moisture, liquids, and accidental contact. IP stands for Ingress Protection or International Protection, and it is defined by the international standard IEC 60529. IP ratings consist of the letters IP followed by two digits and an optional letter. The first digit indicates the level of protection the enclosure provides against access to hazardous parts and the ingress of solid foreign objects. The second digit indicates the level of protection the enclosure provides against the ingress of water or fluids. The higher the number, the better the level of protection. For example, IP65 means the enclosure is dust-tight and can withstand water jets from any direction. IP68 means the enclosure is dust-tight and can be submerged in water under specified conditions.

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