Autodesk 235B1-05A761-1301 User Guide - Page 832

object type See type. Object Viewer A separate window that can display any drawing objects. You can manipulate and view the objects with orbit commands. See also orbit. off center A setting that provides the ability to connect takeoffs at any location within a duct segment. off-the-shelf parts Regularly manufactured parts typically found in stock and commonly used in the building industry. offset See justification/offset. ohm A unit of measurement of electrical impedance; one ohm equals one volt per ampere. open circuit Any break or lack of contact in an electrical circuit, either intentional (switch) or unintentional (bad connection). See also circuit. opening symbol Annotation used to designate the need for an opening in a structural component, such as an opening in a load bearing wall for duct work. See also annotation. orbit To navigate an object in a graphics display window, such as the Floating Viewer or Object Viewer, with user-selected view geometry rotating around a center axis. Using 3D orbit, the user can inspect the object in real time. See also 3D orbit viewing, Floating Viewer, and Object Viewer. orthogonal Having perpendicular slopes or tangents at the point of intersection. orthographic projection The flat-projected 2D representation of a 3D object or model. Typically consists of the top, front, and side views of an object or model. orthographic riser diagram Also called flat riser diagram. Less often used in construction drawings, it shows the plumbing system in elevation. Used for buildings of 2 or more stories that may require more than one orthographic riser diagram to clearly describe the entire plumbing system. over current Any current in excess of the rated current of equipment or circuit. It may result from overload, short circuit, or ground fault. overload Load greater than the load for which the system or mechanism was intended. A fault, such as a short circuit or ground fault, is not an overload. package unit A year-round heating and air conditioning system that has all the components encased in one unit, typically outside the building. panel (1) A cabinet, typically wall-mounted, that serves as a switchboard or control board, including elements such as automatic overcurrent devices, switches for light, heat or power control, and buses. panel (2) The name used to identify a panel when creating circuits. panel rating The ampere rating of an electrical panel. panelboard A single panel or group of panel units designed for assembly in the form of a single panel. See also panel. paper space One of 2 primary spaces in which objects reside. Paper space is used for creating a finished layout for printing or plotting, as opposed to doing drafting or design work. Model space is used for creating your model. See also model space. parameters Specific part properties, such as height and width, that are required to generate a part. parametric In Content Builder a solution method that uses the values of part parameters to determine the geometric configuration of the part. part catalog A collection of common industry-specific, real-world parts that you can select to integrate into your building systems designs. part properties Specific details or traits of an individual building systems part. 814 | Glossary