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11.4.3 Where a luminaire recessed housing also serves as an enclosure, a top surface that is less than
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shall have:5 d- S/ `# v8 z, u$ ^
(a) a maximum of two pryout slots, each having a maximum area of 26 mm2 (0.04 in2); and
- Z$ I; h2 e3 b0 m" F! f& `) `) N(b) ballast mounting slots, each having a maximum unused area of 26 mm2 (0.04 in2). ?4 ~5 P0 ^+ D/ |
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与水平面小于30度的顶部表面是什么意思 意思就是housing最上面的帽子?
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