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如何对电吹风分离电路做39.3.3和39.3.4?UL859
5 ^& ~' h+ @# u3 Y# M W1 uThe air inlet opening shall be gradually obstructed until the operation of all circuits is interrupted9 {1 J, l- x, c+ _/ @: s0 S
by the functioning of a limit or a temperature control, or until ultimate results are otherwise obtained6 z0 ^; q5 G Q$ g
39.3.4.2 The air outlet is to be gradually obstructed using masking tape such that approximately 50, 75,( }: h Z4 b5 F& C2 g
90, and 100 percent of the outlet opening area is progressively blocked for 3 minutes at each of the four' e6 a6 D2 E- S" W" W E1 F( }
positions. For each of three samples, the location at which the blocking begins (the top, a side, or bottom)" a p3 D5 b7 G* I
is to progress in the same direction in which it was started and is to be such that the limit control will
" t! ?( l c, ?' n/ U8 O! |0 Mremain in the air flow for the longest possible time as blocking progresses. If temperatures cause
/ I4 |+ d* ~( N) x! cdegradation of the tape, or if the use of tape would cause deformation of an outlet nozzle, a metal plate- K# e5 `4 W/ K' @) D8 O
or other material resistant to combustion may be used to block the outlet opening. If the final 100 percent
! I' C( `: X( b- fblockage test does not result in interruption of all heater and motor circuits by a limit control, the test is to0 S8 i' g1 \2 A( I. D5 w
be continued, at 100 percent blockage, for 7-1/2 hours, at which time ultimate results are considered to& _6 `; d* ~+ t6 x
be achieved.7 i6 f7 j3 q) S2 J" T& V
是不是TCO动作了不停止了,还是做到最终结果或者是FUSE开路? |
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