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Mechanical & Electrical Plans Sometimes, for smaller commercial projects like interior tenant improvements, the electrical may be shown as part of the floor plan, or the electrical and mechanical may be combined in one plan. Sometimes you may be asked for a "Reflected Ceiling Plan", which shows just the light fixtures, mechanical vents, and any other equipment attached to the ceiling. But as requirements for notes, details, etc. in floor plans have become more complex, even for the smallest commercial projects, you may be asked for completely separate electrical, mechanical, plumbing, etc. plans and may even be required to hire a separate consultant for each of these.
This plan or plans 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 commercial tenant improvement project. Larger projects, again, may have to have separate sheets for each function, and even a separate licensed consultant for each. You may click on the image below for a larger view.
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