Layout of Construction Drawings 153
A reflected ceiling plan is drawn to scale. This means that the plan is measured proportionally to a
size that will fit on a drawing sheet. A reflected ceiling plan will most often be at the same scale as the
floor plan. A common scale is one-quarter inch = one foot (scale: 1/4 inch = 1 foot, 0 inches). The re-
flected ceiling plan will be titled with the scale noted at the bottom.
In a reflected ceiling plan each light fixture has an identification letter. A light-fixture legend is in-
cluded on the actual drawing sheet. In the legend, each fixture is listed with its letter and a specification.
The numbers in the hexagon shape are key notes. They describe items on the reflected ceiling plan. For
example: number 2 would list the specification for the T-bar ceiling. Ceiling heights are noted in the oval
shape.
The engineer’s drawings must specify the type, location, and number of panels. On large or com-
plex projects a circuit-breaker layout is included. This can take the form of a legend or diagram which
typically includes number of panels and ampere loads.
Figure 6.21A Electrical diagram for a small residence showing location of switches and fixtures.