所有外壳都提供一定程度的保护，防止人员意外接触到封闭的设备. (外壳可通风)
本产品特点:
- 为室内使用而建造的外壳，提供一定程度的保护，防止掉落的污垢, 并提供一定程度的保护，防止滴落和轻微飞溅的液体.
- 用于室内或室外使用的外壳提供一定程度的保护，防止掉落的污垢, 雨, 雨夹雪, 雪, and windblown dust; and that will be undamaged by external formation of ice on the enclosure.
- Enclosures constructed (without knockouts) for indoor use to provide a degree of protection against falling dirt; against circulating dust, 线头, 纤维, and flying; and against dripping and light splashing of liquids.
