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Mechanical & Electrical Plans Sometimes, for a residential project, the electrical may be shown as part of the floor plan. But as requirements for notes, details, etc. in floor plans have become more complex, I find that the floor plan drawing can easily become too busy and unclear. Also, with the progression of computer-aided design & drafting (CAD) it is now much simpler to just make a copy of the floor plan with all of the other stuff removed, and just add a separate electrical/mechanical plan on another sheet.
This plan will generally use a series of symbols to indicate light fixtures, switches, electrical panels, receptacles, heat registers, return air registers, etc. Dashed lines can show the connections from switches to lights and may also indicate heating duct runs. As Title 24 requirements have also become more complex, and verification of these items in the field becoming more prevalent, these types of plans have also had to become more detailed. The example below is from a small residential remodel & addition. Plans for larger houses may have to be more involved. For commercial projects, they will have to be even more detailed and will likely even require that you hire (generally as a consultant by your architect) a licensed mechanical engineer and a licensed electrical engineer to do complete sets of plans for these areas. I am finding lately that even permits for small commercial tenant improvement projects, formerly having been allowed to be completed by the Owner or their contractor, are now being required to be done through a licensed architect. You may click on the image below for a larger view. |