Marine Electrical Systems USCG Question #295 (Set 10)

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

Maintaining type push buttons linked together mechanically ensure that depressing one button physically releases or locks out the other. Per IEEE 45 and marine control circuit standards, this symbol denotes a maintaining type push button assembly featuring a mechanical interlock.

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