ΙΡ Protection Rating
Classification of electrical material according to EN60529
According to the European standards, the protection rating of the electrical material of electrical installation boxes, fittings and conduits is specified by the IP protection index, that comprises 2 digits where each digit represents a different property of protection against external effects.
1st DIGIT: 0-6 Protection against penetration of solid particles.劫匪与僵尸 劫匪与僵尸 ,金坛二中黄老师 金坛二中黄老师
2nd DIGIT: 0-8 Protection against penetration of liquids.
The glow wire must be applied once to each sample at the most unfavorable utilisation position intended (with the test surface in vertical position).
The sample is considered to have passed the test when there is no visible flame or prolonged glow or when the flames or glow are extinguished within 30 sec from the removal of the glow wire.