Marine Electrical Systems USCG Question #1130 (Set 38)

As shown in figure "6" of the illustration, what does the symbol represent as used in electrical drawings? EL-0026

USCG Exam Illustration EL-0026
USCG Examination Diagram: Illustration EL-0026
Official USCG Answer & Rule Citation

Correct Answer: Option D — maintaining type push button with a mechanical interlock

Figure 6 depicts a maintaining-type push button equipped with a mechanical interlock. This mechanical link ensures that activating one button physically prevents or alters the state of the other, preventing simultaneous conflicting commands in marine motor control centers.

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