I once spec'd auto-firing Halon extinguishers for a new "inner sanctum" 911 room.

Elegant solution, but I recently heard that they got overruled by environmental regs.

"If its environmentally sound, it doesn't work..."


Matt -- when spec'ing power equipment, it is always apropos to select a device that is able to deliver at least 1-1/2 times the amount of power in the calculated power budget. I like to derate by a factor of 2, usually. A power source that is not running "full tilt" in order to do its required job will run cooler and run longer when derated in that fashion. Its better to have it "loafing" rather than straining towards its maximum ability. Don't overdo the derate, either, though, for specifying one that is way over the power budget can have problems of another sort. 2X is plenty. Or, as we say in engineering circles, "double derated".


--Mac

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