1 A/ Q( \3 `% B以下是NFPA 70 2017中的一段话: l! U S! C) ^- I& l8 k+ y) a2 |7 R410.23 Covering of Combustible Material at Outlet Boxes.* r2 I6 j8 O% ^5 F* S
Any combustible wall or ceiling finish exposed between the , L$ ?9 {. z, U7 Cedge of a luminaire canopy or pan and an outlet box having a ! _* |% C. o( j& Fsurface area of 1160 mm2 (180 in.2) or more shall be covered8 U, e/ ?2 U' G, m2 O
with noncombustible material. ( X- W2 D1 W* E' B' S0 Q5 ^: A0 a! w$ t( N' a' O w
6 s5 g* j6 \" c+ B有鉴于此,出现盒与灯具之间之间是能够保持防火屏障。 9 _* g0 T" Z5 n. e& C( ? u) B/ H