Can electric panels/components be installed inside sprinkler riser rooms? If not, what is the code reference?
Thanks in advance.
This might help with start the discussion. Does your riser space have reduced pressure back flow prevent device for the domestic or sprinkler system mains?
I think you need to look at things rationally. I call it the code of common sense. I wonder why you are looking for an Code to resolve your issue. If the valve for the fire or building main's reduced pressure back flow prevention valve (RPZ) in that room were to fail, there could be a full discharge of the relief valve (150-300 gpm). The electrical panels that serves that other than the riser room equipment would become water damaged. If they are critical for the operation of the facility, you will have a major shut down. Imagine a fire hose being released in that room uncontrolled for a indeterminate time. Maybe this will start a discussion.
I would say normal circuit breaker panels yes,
Now once you get to the bigger transformers, they may need their own room. Cannot speak for the bigger stuff.
Yes there is a chance of stuff getting wet, so take that into account.
Fire sprinkler system piping in electrical rooms See this link I believe it answers the Code question. I wanted to add to my last comment.
The key word here is the riser room. Not too sure what other valves, backflows, etc. might be in the room, but if you must install electrical panel boards in a riser room the enclosures probably need to be weatherproof. (See NEC article 312.) The cabinet when used in wet locations (or could be wet as in this case if the riser drain valve is opened) must prevent moisture or water from entering or accumulating inside of the cabinet. Normally riser rooms are only tempered heated, no cooling and most of the time no cooling/ventilation. Depending if you have a backflow preventer in room also, the room could become humid (if you are in a humid climate) which could condense inside of the cabinet from the heat inside the cabinet. You probably also fall under the NEC rule of requiring a minimum of 1/4" air space between the back of the cabinet/panel board and the wall of the room. (Again to avoid condensation forming inside of the cabinet.)
Suggestion - Look for an adjacent area to mount the panel board(s), lot less expensive and lot less risk.
David L Lewis
I think that there are a lot of variables that have to be considered.
Are discussing the sprinkler entrance room? Most of the time, a dedicated sprinkler service entrance riser rooms is not required or provided. When it is required (see Harris County, TX), I have never had a dedicated "riser" room that was large enough to put other stuff into. It ends up being a 3'x3' closet with direct outside entrance (except that Harris County allows an external PIV to be used in lieu of direct outside entrance). Once the room starts getting bigger, it simply becomes a mechanical room. Most of the time when there is no standpipe and a dedicated sprinkler entrance room is not required, the fire service entrance is into a mechanical room, which has sorts of stuff in it.
Are discussing the vertical sprinkler riser to multiple floors in a building that does not have standpipes? No, I do not put the sprinkler piping in the stair tower. I have had AHJ's that interpret the 101 restriction to utilities in the stair tower to include non-standpipe sprinkler risers. In this case, I don't see anything in 13 that tells me where to locate the risers to feed floor zone control assemblies. And since you don't have water flowing from a zone control assembly unless you have a sprinkler operate (or a pipe leak), what is the issue with having a panel in the same mechanical space as the sprinkler control assembly?
Finally, I get very concerned when I see an AHJ that requires an RPZ as the backflow preventer for the fire service. This induces a point of failure that could prevent the sprinkler system from performing. I always provide a double check valve assembly unless the AHJ demands an RPZ. When an RPZ is required, I always document with the AHJ that there is a failure mode that will create issues. Provided duplex RPZ's doesn't solve the problem is one of the units fails to full discharge flow.
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