Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010, User Manual, Page: 840 / 878

Demand Factor Demand factor is a value used for calculating the estimated demand load of a circuit or
device. The value is defined with a style name, and the name is what displays in Circuit Manager and on
Power and Lighting connectors. It is a property for Power and Lighting system types only. The value of the
definition can be modified using the demand factor style. A demand factor specified on a connector always
overrides the circuit demand factor. See also Estimated Demand Load.
Description You can specify a unique description for a part that gives distinguishing information about
that part.
Designation ID The designation is an optional number or string of characters that you assign to the schematic
line. The designation can also be used to group schematic lines for scheduling purposes.
Diameter You can specify a diameter for parts or select a diameter from the list of available sizes from the
part catalogs. Diameter determines the actual size of the part to use during layout. Use an undefined diameter
for conceptual layouts when no part or design details are known. You can change the diameter for specific
segments or an entire building systems network.
Elbow Angle The elbow angle allows you to specify which radius to use when laying out ducts, pipes,
conduits, and cable trays using the layout method “Routing.”
Elevation Elevations ensure that you insert a series of parts at the same height. The elevation of a part is
used to determine its position in model view, including rises and drops. In plan view, parts are always inserted
using the current drawing elevation. You can lay out rises or drops in plan view by entering a new elevation.
You can also choose to rise or drop the segment with a specific angle. You can specify an elevation for a
building systems network or select one from the list of predefined elevations in the drawing. For fittings,
the elevation is assigned by the connecting part segments. For MvParts, the elevation is used to determine
the default system connection points. For wire, the elevation is used for calculating circuit lengths for panel
scheduling. For plumbing lines, the elevation is used for calculating pipe size.
Engineering Data Design specifications for engineering spaces that are used to calculate energy requirements
for rooms and zones. Engineering data consists of air flow requirements and calculations, heating and cooling
design temperatures, and heat gain and loss contributors.
Engineering Properties Engineering properties for an engineering space contain calculated values for heating
loads, cooling loads, and air flow requirements. Engineering properties are assigned to an engineering space
using the Import gbXML command.
Estimated Demand Load Estimated demand load displays the calculated load based on the demand factor
definition used for a circuit or device. It is a property for Power and Lighting circuits only. This property
changes if the demand factor of the circuit is modified or if the circuit load is modified. See Demand Factor.
Gauge You can specify a gauge for piping by selecting one from the list of available pipe schedules. The pipe
schedule defines which AutoCAD MEP catalog to use during layout. You can change the gauge for specific
pipe segments or an entire piping network.
Heating Load The amount of heating units required to heat a room or zone based on engineering space
analysis. The heating load is displayed in the Engineering Properties dialog.
Home Run You can add a home run arrow to the end of a circuit run, in the direction of the associated
panel. Home run is a read-only property that indicates whether a home run has been specified for the wire
by a yes or no value.
ID ID is an optional number or string of characters that you can assign to schematic symbols, devices, and
panels. The ID can also be used to group schematic symbols, devices, or panels for scheduling purposes.
Insulation Thickness You can specify the thickness of insulation added to a single segment or fitting, a
group of segments or fittings, or an entire building systems network.
Justification The justification property determines the drag point for schematic symbols, devices, and panels.
The drag point is the point around which the block rotates. The default justification is the standard AutoCAD
®
block insertion point. For most layout situations, this should work well. However, if you want to change
822 | Glossary