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Housing可以当外壳,在UL1598中,条款如下:+ ]+ {' v# X' b ?/ W6 W
11.4.3 Where a luminaire recessed housing also serves as an enclosure, a top surface that is less than+ b. d: N# z; T! @' p) z: A1 D
30 degrees from the horizontal and any outer wall that contains any of the parts specified in Clause 5.3.2 shall have:
4 b8 |, h1 E: O! Q(a) a maximum of two pryout slots, each having a maximum area of 26 mm2 (0.04 in2); and
# L5 |5 g" O/ C, m5 E+ z0 g. M# Q$ p(b) ballast mounting slots, each having a maximum unused area of 26 mm2 (0.04 in2). |
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