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Question:

a complete information on how a fire alaram operates, it's principle & mechanism?

importance, accessories,circuit description, operation and many more details

Answer:

PVC pipe is measured by outside diameter. Inside diameter varies depending on the pressure rating. For instance, class 160 (160 psi rated) will have the same o.d. as class 200, but will have thinner walls, for a different i.d. The string method is probably the best way to determine your pipe size. Wrap the string, make a mark, and then go to the hardware store and find the same size pipe. All fittings will work on that size pipe.
they dont fight electric fires w/ water
in order to be electrocuted, you have to complete a circuit using your body. unless there are lightning bolts shooting from the electrical equipment, it's probably not going to happen. this is what hollywood has done.
ummm, it could be really bad or it could be nothing, it really depends on the car u drive. you could be scraping the bottom of the engine and transmission which would be very bad, or you could have a skid plate for this exact reason.
first off their is there boots that should help prevent a grounding for the current. Also it would have to be a steady stream of water to carry the current, and depending on the setting on the nozzel the water is actually being broken into alot of little droplets since they will absorb the heat better and cool the fire thus putting it out. Lastly, power should be cut to any building where their is a fire, either the meter is pulled by the firedepartment, or the trip the circutit breaker, if the fire itself hasnt already shorted everythign out.

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