Device symbols for the power and lighting plan: receptacles, switches, the panel they home run to, and ceiling fixtures. Device symbols are drawn at plan scale rather than to physical device size, which is the convention these follow. Free DXF downloads.
7 blocks in 2 families. DXF R2018, drawn in inches.
The power and lighting plan starts with a small vocabulary, and this category supplies the core of it in seven symbols: a duplex receptacle, a 220V receptacle, a single-pole switch, an electrical panel, a recessed can, a ceiling-mounted fixture and a chandelier. The electrical engineer or designer draws them over the architectural floor plan, receptacles and panels on E-POWR, switches and fixtures on E-LITE, so a lighting-only or power-only plot is one layer toggle away.
These are symbols, not physical devices. The receptacles are 8 in circles and the switch is under 3 in, sized to read at 1/4 in scale rather than to match a 2 x 4 in device plate. Lighting fixtures are closer to real size: the recessed can is an 8 in circle, the ceiling fixture about 11 in, the chandelier 30 in with its arm count as a parameter. The panel is the exception that must be drawn true, 14 x 4 in by default and adjustable to 42 in wide, because NEC 110.26 requires working space in front of it at least 30 in wide and, for most 120/240V equipment, 36 in deep. Draw that rectangle and keep doors, shelving and water heaters out of it.
Receptacle spacing is the classic plan check. In dwelling rooms NEC 210.52(A) says no point along the floor line of a wall may be more than 6 ft from a receptacle, which works out to one at least every 12 ft of wall, with any wall space 2 ft or wider counted. Kitchen countertops have tighter spacing, laundry areas need their own receptacle, and bathrooms need one near the basin.
Placement tips: wall devices insert at their mount point on the wall line, so snap them to the wall face and they sit on the correct side. Ceiling fixtures insert at the fixture center, which is also the outlet box, so place them from the reflected ceiling grid. Use the 220V receptacle for ranges, dryers and other 240V loads so the circuit type is legible without a tag.
Download each symbol free as DXF, DWG or PNG, or place them directly in the CADdillo editor at app.caddillo.com from a browser.
Plan-view footprint in inches. Each name opens the block's section on its family page, with DXF, DWG and PNG downloads.
In dwelling rooms, NEC 210.52(A) requires receptacles so that no point along the floor line of any wall space is more than 6 ft from one, meaning spacing of 12 ft or less, with any wall 2 ft or wider counted. Kitchen countertops, bathrooms and laundries have their own rules.
NEC 110.26 requires a working space in front of the panel at least 30 in wide, or the panel's width if greater, and 36 in deep for most equipment at 150V or less to ground, with 6.5 ft of headroom. The panel block is 14 x 4 in; draw the working-space rectangle with it.
Not literally. Device symbols are drawn at a size that reads at plan scale: the receptacles here are 8 in circles and the switch is about 2.7 in wide. Items that occupy real space, like the 14 in panel or the 30 in chandelier, are drawn closer to true size because clearance and layout depend on them.
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