第一種學說：看GB1498-79，電機、低壓電器外殼防護等級 什么是IP（防護等級）？ IP（International Protection）防護等級系統是由IEC（International Electro Technical Commission）所起草。將燈具依其防塵、防止外物侵入、防水、防濕氣之特性加以分級。這里所指的外物包含工具、人的手指等均不可接觸到燈具內之帶電部分，以免觸電。 IP
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