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本帖最后由 nnren 于 2011-2-11 16:45 编辑 , r0 Q5 Y$ {' ?* J/ F# f! u& I/ Y
" ~) h1 Y R( |+ C5 }" m想贴出来给大家看看。* R1 A5 F1 C+ N3 n% f
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Subject: Real Electrical Fire Example
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2 v6 }. i6 I5 v# y# ?% GBasic facts of the case: *8 _2 M, V d4 j+ Q, k
---Electrician received a work order to inverstigate why hall way lights wre not working in an underground pedestrican tunnel between two buildings
5 E3 R5 K4 B- F, J5 a; a4 i---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.
5 F* G8 A$ I! y$ l---Electrician entered the room and when he opened the panel door, observed a series of breakers that were open in tripped position.
. s+ P& q' T' e' i! r$ x; L---Electrician assumed since the breakers were in the same general area, they controlled the hallway lights.) B6 S& d5 E# L( v9 b: C2 b
---When the electrician closed the breakers, they immediately tripped again.
( z, \0 w. h4 k1 |" a* O9 k8 I0 {+ x( {---The electrician again closed the breakers and this time they stayed closed.3 g0 |% {! {7 a# }7 Y2 ?# a N
---The electrician left the mechanical room to investigate whether the lights had come on or not.& S' W' a+ ^& A7 y, L
---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.
* M' y9 D! w/ r: J W/ q4 _---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.
+ M" p) L+ z' M0 _7 F---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." D2 \" q3 E( F) N3 W
---The local fire department was called and fire was extinguished.
5 z7 | h/ U; ]: B+ i; v---Damage was confined to the mechanical room.
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t3 R! T& j, ]1 K, h* w7 {Additional Information---Mechanical room contained steam lines, chilled water pumps, and electrical panels, K8 B+ ]6 u# n& J0 u
---Room was kept under lock and key
, r) X) W1 b" w. n4 K. R---The electrical panel did not have circuit breaker labels.
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Discuss: --- What went wrong with this assignment?1 T; ]" F/ n7 @# Y$ `
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答案等有些回应再贴吧。 |
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