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Académie
Garage Door Technician
Garage Door Electrical Controls Certification
UL 325 Safety Standards & Entrapment Protection
Vérification des connaissances
UL 325 Safety Standards & Entrapment Protection
Vérification des connaissances
Vérification des connaissances
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A commercial door operator's emergency stop button uses normally closed contacts wired in series. If the E-stop wire is accidentally cut, what happens?
A
The door stops and cannot be moved until the wire is repaired
B
The door continues operating normally
C
The opener alarm sounds
D
The opener switches to battery backup
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