Autodesk 235B1-05A761-1301 User Guide - Page 835

section marks Annotation used to designate where source objects are being cut to generate a section view. segment An individual piece of ductwork or piping connected together by fittings to create a run. Typically, a straight piece of duct or pipe cut to a standard length determined by the design and/or manufacturer. segment mode The layout method for flex duct or flex pipe. You can specify Line mode, Arc mode, or Spline mode. service disconnect A switch that enables a person to shut off power to the building (normally used for maintenance or in emergency situations). service drop Run of cables from the power company's aerial power lines to the point of connection in the building. service entrance The location where the incoming power supply enters the building. service equipment The necessary equipment, usually consisting of a circuit breaker or switch and fuses and their accessories, located near the service entrance to a building and intended to act as the main control and cutoff means for the power supply to the building. service lateral The underground service lines between the street main, including any risers at a pole or other structure or from transformers, and the first point of connection to the service-entrance lines into a building. service panel The main electrical panel where all the circuits tie into the incoming power supply. service/supply leads The incoming electrical lines that supply power to the service panel. sewage pump A machine used to exhaust waste matter. shape The actual shape, such as rectangular, oval, or round, of a segment or fitting. Shape defines which part catalog to use during layout. single pole A switch that controls a device from one location. single-line drawing A plan view drawing that uses a single line to show the plumbing system and describes the basic function of the system. The centerline of the pipe, regardless of pipe size, is drawn as a single line to which valve, equipment, and fixture symbols are added. The size of the symbols is left to the discretion of the drafter. size The actual dimensions of a part, including length, width, height, and diameter. slice An object representing a horizontal section, or slice, through any collection of AEC objects. See also quick slice. slope The pitch of an inclined segment, usually expressed as a ratio of the vertical rise to the horizontal run of a pipe segment. Slope is commonly expressed in a fractional format, 1/4 inch/1 foot or 1/10. slope arrow labels Arrows used as annotation to specify the slope of a pipe segment. See also slope. slots The spaces to install circuit breakers in an electrical panel (also referred to as "poles"). snap angle The angle around which the snap grid is rotated. See also snap grid and snap mode. snap grid An invisible grid that locks the cursor into a specific alignment and snap increment when Snap mode is enabled. Snap grid does not necessarily correspond to the visible grid, which is controlled separately by the GRID command. See also snap angle and snap mode. snap mode A drawing mode where the cursor is locked into alignment with an invisible grid, forcing the cursor to snap to the nearest point on the grid. See also snap angle and snap grid. snaps Object methods for selecting commonly needed points on an object while you create or edit a building systems layout. Snaps in AutoCAD MEP are accurate snap points of connection for building systems components. See also object snaps. Glossary | 817