On an electrical plan, a circle with three lines extending from it represents what type of outlet?
Correct Answer
A) 220V outlet
A circle with three lines extending from it is the standard electrical symbol for a 220V or 240V outlet, indicating a three-wire connection for high-voltage appliances like dryers or air conditioning units.
Why This Is the Correct Answer
CORRECT_ANSWER - The electrical symbol of a circle with three lines extending from it specifically represents a 220V/240V outlet. The three lines indicate the three-wire configuration (two hot wires and one ground) that is characteristic of high-voltage electrical connections. This symbol is standardized across electrical plans and blueprints to distinguish high-voltage outlets from standard 120V receptacles.
Why the Other Options Are Wrong
Option B: GFCI protected outlet
A standard duplex receptacle is represented by a circle with two parallel lines or a simple circle with two short lines, not three lines extending from it.
Option C: Ceiling-mounted light fixture
Ceiling-mounted light fixtures are represented by different symbols, typically a circle with lines radiating outward in all directions or a circle with an 'X' through it, not three specific lines extending from a circle.
Option D: Standard duplex receptacle
GFCI protected outlets are typically shown as a standard receptacle symbol with additional notation like 'GFCI' text or a special marking, not a circle with three lines.
Memory Technique
Think 'Three lines = Three-wire = Two-Twenty volts' - the triple connection helps you remember this is for high-voltage 220V outlets used for major appliances.
Reference Hint
NEC (National Electrical Code) Chapter 9 - Tables and Annexes, or electrical symbol reference charts in construction blueprint reading guides
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