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如何对电吹风分离电路做39.3.3和39.3.4?UL859
* G2 ?5 S, e- q: ~0 [The air inlet opening shall be gradually obstructed until the operation of all circuits is interrupted5 G$ @+ e1 E5 ?! C3 V& n
by the functioning of a limit or a temperature control, or until ultimate results are otherwise obtained/ {- t7 n3 f1 d! V& D1 S5 O
39.3.4.2 The air outlet is to be gradually obstructed using masking tape such that approximately 50, 75,
* {( L2 f- Y; X9 Y90, and 100 percent of the outlet opening area is progressively blocked for 3 minutes at each of the four" j. Y! O2 j: U* z
positions. For each of three samples, the location at which the blocking begins (the top, a side, or bottom)5 I/ M2 q% K' h* X
is to progress in the same direction in which it was started and is to be such that the limit control will
9 a1 H: |8 k3 a1 kremain in the air flow for the longest possible time as blocking progresses. If temperatures cause# J4 a- Z$ M; }/ ~
degradation of the tape, or if the use of tape would cause deformation of an outlet nozzle, a metal plate9 e4 y4 Z2 ~4 C) U9 o: d3 y
or other material resistant to combustion may be used to block the outlet opening. If the final 100 percent$ @( u! d J: F* ?9 ^. @
blockage test does not result in interruption of all heater and motor circuits by a limit control, the test is to5 z" E p& e% I" [* S" e
be continued, at 100 percent blockage, for 7-1/2 hours, at which time ultimate results are considered to
9 }7 Z# g T; f. Fbe achieved.% [) D4 A a! L
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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