Enclosures for indoor or outdoor locations Perfect Steerable Transfer Cartlude Types 3, 3R, 3S, 3X, 3RX, 3SX, 4, 4X, 6 and 6P. In the section for outdoor enclosures, sleet is listed twice as an environmental condition, but an asterisk next to one sleet references a footnote directly under Table 110.28, which states the mechanism shall be operable when ice covered.