2.26 入侵保护（IP）

要求：必须通过或超过IP56的目标，根据IEC60529入侵保护标志。该测试适用于分频器网络、变压器和旋转开关所在的外壳的水密室。只适用于型号A、B、C。

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2.26 Ingress Protection (IP) 

Requirement: must pass or exceed the IP56 target, as per IEC60529 Ingress Protection marking. The test applies to the watertight chamber of the enclosure where the crossover network, transformer and rotary switch are located. Applies only to models A, B, C.