Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010, User Manual, Page: 823 / 878

butt welded 2 pieces of metal that are butted together, with the abutted ends thickened, shortened, and
fused using heat.
cable Electrical wires protected by plastic tubing, metal sheathing, or another protective covering.
cable tray An assembly of segments and fittings forming a rigid structural system, used to securely fasten
or support cables, wires, and raceways.
calculated size Size determined by the resulting value of a mathematical equation (calculation).
capacity The quantity of electricity that can be delivered from a unit, such as the output from a generator.
Catalog Editor A tool used to modify the content of the catalogs in some way, such as adding tracking
information to a new part. See also content.
ceiling grid A rectangular arrangement of parallel lines forming a pattern for laying out ceiling tile and
fixtures in a building.
cell anchor A feature that fastens, or anchors, an object to the cell position of a 2D or 3D layout object. The
anchored object’s movement and size are constrained by the cell.
centerline A line used to indicate the axes of symmetrical objects, the center of a segment or fitting, and
paths of motion.
chase A vertical passage in a wall where ducts, pipes, and wires can be run through a building.
circuit (1) A continuous loop of current from a power source, with “hot” wire to the device and “neutral”
wire back to the source.
circuit (2) An object used to connect devices and MvParts to panels. See also closed circuit and open circuit.
circuit breaker A common type of protection for over current. A circuit breaker is used to break contact in
an overload condition, resulting in an open circuit. See also over current.
circuit length A rough estimate of the total length of all the wires in a single circuit. Circuit length is
calculated by adding the XY distances between electrical devices to the rise/drop distances between the wire
and device elevations.
circuit load Circuit load is the voltage on a circuit that contains the system type Power and Lighting. All
devices connected to the circuit must have a voltage in the range of the voltage definition. See also voltage.
circuit voltage The voltage of all the devices in a single circuit.
clean up Joining appropriate parts of 2 different components by lengthening, shortening, or breaking lines
that represent boundaries of the components. For example, when adding an elbow to a run, the segments
are trimmed back to allow room for the elbow.
closed circuit An electrical circuit in which there is no interruption of current flow. See also circuit.
command line A text area on screen reserved for keyboard input, prompts, and messages.
compass A tool used to navigate your way through a building as you lay out building systems components.
component (1) A fundamental element of an object, such as the centerline of a segment.
component (2) A single piece or part of a building systems design.
conceptual design phase Initial design phase of a building project. Also referred to as schematic or
preliminary design.
condensate line A pipe that drains excess water from an air conditioning unit. The water results from vapor
condensing on the cool surfaces inside the unit.
conduit A tubular material used to encase and protect electrical wiring: typically plastic or metal.
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