In a schematic drawing, when an edge of a component is indicated as being located inside an enclosure, which line should be used? See illustration GS-0031.
• Standard drafting symbols for visible vs hidden edges in mechanical/electrical schematics • Purpose of a dimension line compared with an outline or hidden edge • How line thickness and dash patterns indicate what is inside an enclosure versus on the outside
• Looking at the four choices A–D, which one is clearly used for measurements, not for showing an edge? Eliminate that first. • Between a solid line and a dashed line, which is normally used to represent something you cannot directly see (like an edge inside an enclosure or behind a panel)? • For an internal or hidden edge, would you expect the line to be heavy and bold like an outer boundary, or a different style to show it is not directly visible?
• Be sure you recognize that the line with arrows and numbers is a dimension line, not an edge line. • Confirm which line type in the illustration is commonly labeled as a hidden edge or hidden detail in drafting standards. • Double‑check that the line you pick is not normally used as the visible outer outline of a part or enclosure.
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