110.26 Space Requirements about Service Equipment

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donselec

donselec

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Aurora, CO, USA
Maybe this has been discussed, I couldn't find it; but I'm trying to differentiate between 110.26(A)(3) which says the height of the workspace must be clear to 6 1/2 feet or the height of the equipment, whichever is greater. Exception 1, in existing dwelling units equipment less than 200 amps is permitted where the space is less than 6 1/2 feet. But then in 110.26(E)(1)(a) Dedicated space must be to a height of 6 feet above the equipment or to the structural ceiling... I have a sub-panel in a residential basement (60 amps) and there are 2 6-inch air ducts supplying fresh air to the furnace room, located on the ceiling above the panel. Which rule is applicable? Perhaps 110.26(E) is for commercial work only (panelboards, switch-gear, etc.? Not sure. Thanks for any help.
 
I think you are merging the rules for working space, which is in front of the equipment ,with the rules for dedicated space, which is directly above the equipment.
Is the panel flush or surface mounted and do the ducts go through the wall or just along the surface?
 
GoldDigger said:
I think you are merging the rules for working space, which is in front of the equipment ,with the rules for dedicated space, which is directly above the equipment.
Is the panel flush or surface mounted and do the ducts go through the wall or just along the surface?
Click to expand...

Could be. The panel is flush-mounted in the wall and the ducts are on the ceiling going through the wall into the adjacent furnace room.
 
Yes I see the difference in the 2 rules now, one for "working space" and the other for dedicated space equal to the width and depth of the equipment. I'm not sure if that was meant to apply to panels recessed in walls, that's kind of strange. But there is an exception that should apply to me, 110.26(E)(1)(b): The area above the dedicated space shall be permitted to contain foreign systems provided protection is installed to avoid damage from leakage, condensation, etc. Hopefully.
 
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