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Ingress Protection (IP) is a European rating that describes the degree of protection provided by an enclosure of electrical equipment. The rating system consists of the letters IP followed by two numbers:
The first number indicates the degree of protection against solid foreign object ingress.
The second number indicates the degree of protection against liquid ingress.
According to this system an IP65 enclosure will not allow the ingress of dust and is protected against jets of water from any direction. IP65 enclosures are ideal therefore for use in wet and wash-down environments for example food preparation areas.
For outdoor LED display it is usually IP65 front and IP43 Rear
And for outdoor indoor LED screen it is usually IP31.