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本帖最后由 nnren 于 2011-2-11 16:45 编辑 6 e) k b V; m' f1 V
4 v9 `" N: L. O想贴出来给大家看看。
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$ `0 J6 f2 `" g& M. O( y; y" o1 E! kSubject: Real Electrical Fire Example
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; ?+ B; [- f# m: h$ S& F% k0 jBasic facts of the case: *
3 u( @' g+ @) l' U& a) p6 w---Electrician received a work order to inverstigate why hall way lights wre not working in an underground pedestrican tunnel between two buildings
+ Z% d8 A6 u0 Z6 t, [---Electrician went alone to investigate an electrical panel in a mechanical room where he thought the breakers were located. Note: the mechanical room is located in the same underground pedestrian hallway.3 G* c; V$ E3 I4 D
---Electrician entered the room and when he opened the panel door, observed a series of breakers that were open in tripped position.
8 O& r3 l+ R4 j---Electrician assumed since the breakers were in the same general area, they controlled the hallway lights.' E6 _% J# V, O; I5 H O5 T
---When the electrician closed the breakers, they immediately tripped again.! W8 }5 X, |- {; F
---The electrician again closed the breakers and this time they stayed closed.. B9 ]0 U2 n7 g/ o1 E. z/ y L
---The electrician left the mechanical room to investigate whether the lights had come on or not.
% ?! P: F( c# ~6 l" X6 ]: G---The hall lights had not come on , so the electrician assumed there was another electrical panel for the hall lights, and went to maintenance to find a print.
8 ]$ b, j2 [5 ^ g) @5 L* T* H( ?---Sometimes later, as a security guard was passing the door that led to the mechanical room, the observed smoke coming from the electrical box and immediately called for an emergency.
3 X: G' z5 P* ^& a5 w. G---The underground pedestrian hallway was located above one of the office buildings, and therefore the entire office building had to be evacuated because of the fire and smoke., L7 W& s" a+ K, R' {
---The local fire department was called and fire was extinguished.
9 t8 g0 C, r4 e' L---Damage was confined to the mechanical room.
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: T% g- V. |7 h4 @: EAdditional Information---Mechanical room contained steam lines, chilled water pumps, and electrical panels
* {" {7 b+ L9 M6 N---Room was kept under lock and key( t# ?% i5 n5 ~' `
---The electrical panel did not have circuit breaker labels.
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Discuss: --- What went wrong with this assignment?
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答案等有些回应再贴吧。 |
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