in case of fire before the firemen use the water horse is the start of the main electrical supply for the area explain why they do this?

in case of fire before the firemen use the water horse is the start of

1.	in case of fire before the firemen use the water horse is the start of the main electrical supply for the area explain why they do this?
Answer» fire, The electric supply is to be turned off. It has to be DONE to avoid any KIND of short CIRCUIT in the AREA.