keep a fire exstinguisher close by. not that i think you are at high risk for using a 430 in a 400 but it's better safe than sorry. you guys may think i'm just paranoid but if a fire does start you better be able to but it out yourself or your best hope is jail if not the hospital or dead! i was meticulus when wiring up my grows. everything i did is up to code. i would not be able to deal with the guilt if my children became homless or worse because my grow burned down the house! sorry if this post rambles on, i'm pretty stoned.