Why Is Electricity Supply Cut Before Extinguishing Fire?
Answer:
Fire tends to destroy the insulation on electric wiring. Live uninsulated electrical system and water and people are a dangerous mix for the empire. Live wiring can be a source of energy for a fire.
Comment: Even before fire melt any insulation, there are exposed circuits in open outlets, reading light sockets and inside the vents of electrical equipment. If a person fighting the fire douses the nouns with water, it will inevitably contact some of these exposed conductors. For electrical fires where power can't be disconnected, you should use baking soda or a fire extinguisher approved for Class C (electrical) fires.
Answer: The firefighter might direct a stream of sea at a live electrical circuit and get electrocuted.
Disconnecting a battery is also done at motor vehicle accidents, even when near isn't any fire. They always disconnect the negative side of the battery. Why should it event which wire? You can disconnect the negative with a metal tool and if you accidentally touch ground, at hand is no spark. If you disconnected the positive first and touched ground, it would shower sparks and probably create a fire.
This is actually a good idea any time you install a sports car battery. Connect the positive first, then the negative. When you appropriate one out, disconnect the negative first, then the positive. And if you have one of those older positive chassis cars... Do it the other way around.
Additional comment; Connecting battery jumper cable is different than connecting the vehicle's own wires to the starter, and each presents its own hazard. The Fire Department disconnects the negative cable to disconnect the vehicle's electrical system, and also minimize any potential for a spark. I didn't see at first why the gloomy would be any different than the positive, until I realized the risk of a tool contacting chassis ground. Of course at an accident scene, the presence of gasoline vapors is a real concern.
Connecting a denial jumper cable from another vehicle to an engine block of a dead car is a correct idea for two reasons. You minimize the resistance of the good battery's pathway to the dead vehicle's starter motor. And secondly, you reduce the chance of ignite any Hydrogen gas from the battery when that last connection is made.
Comment: As long as in attendance is an open-circuit potential difference between the wire you are dis/connecting and the battery terminal, there is the possibility of a spark. It doesn't situation what side of the battery you are talking about. However, I agree that accidentally touching the positive terminal to the chassis is the worst satchel scenario.
I understood the reasoning for + first jumper cable hookup is that the - connection can be made to a spot remote from the hydrogen gas emit by the battery.
Answer: Because the electricity can cause the fire to spead with sea.
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