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	Subject - Dust Control power and tools acejake Thanks for the posts earlier regarding single phase and three phase power. As mentioned, I am setting up a 5000sq ft wood shop (in an industrial area). I am targeting a place with 3 ph after reading your posts. The Uniform Fire code states that all Dust producing equipment must be wired so they can not be turned on unless the Dust Control system is operating. I called the fire Marshall to be sure, and she read from the same page of the Uniform Fire Code, that I did to answer my question. This certainly seems like a good safety practice. My question is, is this hard to do? And or is it expensive? Does one use mangetic relay's, for each tool or is the power turned off at a central location when the DC is not operating? Anyway I assume this problem has been solved thousands of times and is standard practice, there fore I am hoping it is not that complicated for the Electrical Contractor. I am asking the question to understand if I should consider this issue in the layout of equipment, or not. I will have approxamately 10 tools ranging from 1 hp to 7.5 hp. I will most likely have 3 or 4 that are 3 ph power. Thanks iwire The most common way I see it done is to devote one or more panels just for the supply of the dust producing equipment. The feeder to this panel(s) will have a contactor that kills the power to the panel(s) when the dust control is not on. Not cheap, and there are other ways like separate relays for each device but that is not cheap either and is a pain to do every time equipment is changed. A cheaper way out is a shunt trip main breaker panel set up with a current sensor that is bypassed when the dust control is on. If you try to start the equipment without the dust control bypassing the current sensor it will cause the breaker to trip out. This will work but if you are forgetful and keep trying to start the equipment before the dust control the breaker will wear out as they are no made for repeated duty like a contactor is