In case of fire before the firemen uses the water hoses they shut off the main electrical supply for the area explain why they do this.
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Explanation:
It is because tap water can conduct electricity because of it contains impurities whereas pure water can't
water uses by fireman is tap water which is impure means it contains ions that's why they shut off the main electrical supply for the area
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Answer:
Firemen shuts off the main electrical supply for the area because water is a good conductor of electricity and the firemen can get electrocuted.
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