When the electric meter box catches fire, the power should be cut off first before extinguishing the fire. Here is a detailed explanation:

Firstly, a fire in the electricity meter box is often related to circuit faults or overheating of electrical equipment, at which point the circuit may still be energized. If extinguishing the fire directly, it may cause electric shock to the extinguisher and result in serious safety accidents. Therefore, before extinguishing the fire, it is necessary to ensure that the power has been cut off to eliminate the risk of electric shock.

Secondly, after cutting off the power, appropriate firefighting equipment can be used to extinguish the fire. Generally speaking, dry powder fire extinguishers, gas fire extinguishers, and sand can be used to extinguish fires in electric meter boxes. If the fire is large or uncontrollable, immediately call the fire department and wait for rescue.

In summary, when the electric meter box catches fire, the power should be cut off first to ensure safety, and then appropriate firefighting equipment should be used to extinguish the fire. This is an important measure to ensure personnel safety and reduce fire losses.