īesides all that the change order to locate it elsewhere is a nice bit of time and materials work. You are likely to be off the job when the Fire Inspection for the Use and Occupancy permit occurs but that doesn't reduce the likelihood of a flush mounted panel board cabinet failing fire inspection. While I'm on the subject of Fire Walls be aware that a flush mount panel cabinet in a fire wall will often pass electrical inspection and usually fail fire inspection. Installing the wrong box type can radically shorten the fire duration it can withstand. Fire walls have varying duration of resistance to the passage of fire from one side to the other. Even if that box will not be closely inspected have some personal ethics and cut, mount, cable, and patch the new box. Only stud and bar supported boxes have been used in the testing. No old work box that I know of can be part of a listed fire wall assembly because the assemblies have not been tested for old work boxes. Fire walls are built into structures to provide time for occupants to escape, Allow the disabled to reach a place of refuge, and contain the fire long enough for manual fire suppression efforts to be applied. Caution: If you encounter metal lath you need to make certain you are not cutting into a fire wall. Those come in different arm lengths for different thicknesses of wall sheathing. If you are connecting an existing Armored Cable using a metal box you may have to use Madison or F straps. If you can get close to a stud that will help limit lath separation as well. Important: the blade must be fine enough to avoid vibrating the lath. The metal cutting blades will resist dulling by the abrasion of the plaster for longer use. The blades are resistant to bending and the width of the kerf makes it easier for the teeth to clear the cut on each stroke. All reciprocating saw blades cut on pull so that is not an issue. Use the finer toothed metal cutting Saber Saw blades and manual handle to hold them. If you're not in a tearing hurry use a dry sponge to put moderate pressure on the drywall to prevent it separating from the old plaster.
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