|
本帖最后由 passagere 于 2021-8-31 09:51 编辑 2 ^0 @# z4 T2 L( B
2 [5 ]! |/ Q4 C
以下是NFPA 70 2017中的一段话:1 V; K1 r- S' ~1 U9 G. a% Q0 z% C, K
410.23 Covering of Combustible Material at Outlet Boxes.+ C4 j5 L, H1 ~3 n+ H# n" J8 Q
Any combustible wall or ceiling finish exposed between the
# d9 @8 B! \3 J8 Nedge of a luminaire canopy or pan and an outlet box having a
! `* N1 D/ C2 W+ B; J, [surface area of 1160 mm2 (180 in.2) or more shall be covered2 b! z/ Y) f$ [5 O+ n
with noncombustible material.
4 S$ P# e( `5 z W/ F
2 M4 Z5 h% e2 v& ?+ g0 \6 y7 T( K f9 h
Q% E& S! H5 o$ ^有鉴于此,出现盒与灯具之间之间是能够保持防火屏障。, P, i( ` f6 _
|
|