What electrical symbol represents a duplex receptacle outlet on construction drawings?
Correct Answer
C) A circle with two short perpendicular lines
A duplex receptacle outlet is represented by a circle with two short perpendicular lines extending from it. This is the standard electrical symbol used on construction drawings.
Why This Is the Correct Answer
Option C is correct because a duplex receptacle outlet is universally represented by a circle with two short perpendicular lines extending from it on electrical drawings. This symbol is standardized across the construction industry and follows IEEE/ANSI standards for electrical symbols. The circle represents the outlet box location, while the two perpendicular lines indicate it's a duplex (two-plug) receptacle. This symbol clearly distinguishes it from other electrical devices and is consistently used on construction drawings nationwide.
Why the Other Options Are Wrong
Option A: A circle with two parallel lines
A circle with two parallel lines is not the standard symbol for a duplex receptacle outlet. This symbol configuration is not recognized in standard electrical drawing conventions and could be confused with other electrical components.
Option B: A circle with the letter 'S'
A circle with the letter 'S' typically represents a switch on electrical drawings, not a duplex receptacle outlet. The 'S' designation is specifically reserved for switching devices in electrical symbol standards.
Option D: A square with diagonal lines
A square with diagonal lines is not the standard symbol for electrical outlets and is not part of the recognized electrical symbol set. This symbol configuration does not appear in standard electrical drawing conventions.
Memory Technique
Remember 'Duplex = Double perpendicular' - the two perpendicular lines represent the two outlets in a duplex receptacle, and they stick out perpendicular (at 90 degrees) from the circle like plugs would stick out from the wall.
Reference Hint
Look up electrical symbols in the NEC (National Electrical Code) Appendix or any standard electrical drawing reference guide. Most construction drawing standards books have electrical symbol charts in their electrical sections.
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