In a 3 phase,400v,4 wire system, 2 incandescent lamps, one
having 230v,100w and the other 230v,200w are connected between
r phase- neutral and y phase-neutral respectively. If neutral
wire breaks which lamp will fuse first and why?
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Answer Posted / velmurugan
100W lamp will fail first, Although the voltage across 100 w
lamp will be higher (293V), but it will fail because of
effective current (0.489A) which is more than the 100 w
lamp normal current (0.4A). Increase in current cause more
heat and heating element will fail.
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