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JIS stands for Japan Industrial Standard, an industrial standard system.
Grade 1: protected against dripping water for 10 min at 200mm
Grade 2: protected against dripping water when tilted up to 15 degrees for 10 min at 200mm
Grade 3: protected against spraying water for 10 min at 200mm
Grade 4: protected against splashing water for 10 min at 300-600mm
Grade 5: protected against water jets for 3 min at 3m
Grade 6: protected against heavy seas for 30 min at 3m
Grade 7: protected against the effects of immersion for 30 min
Grade 8: protected against submersion
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