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The other type is compound: flameproof + increased safety. The components that are installed inside are explosion-proof, not ordinary components, and are handled. Then add an increased safety box. It's all right! 
Common distribution box how to change the explosion-proof distribution box
Is just like the ordinary distribution box, but some dangerous areas need to be explosion-proof, so some use explosion-proof, built-in ordinary circuit breakers, ah, what the terminals, just outside the shell of an aluminum alloy. It's thick and sealed so that other things like hydrogen aren't gas. What's more, it means that it doesn't matter if an explosion occurs. It is fried in this box, and it is not badly fried.