Ul 489 Vs 1077. Ul 1077 3 8 inch through the air 1 2 inch over surface. However each motor is protected by a ul1077 supplemental miniature breaker.
Ul 1077 devices cannot be used in place of ul 489. Ul 489 1 inch through the air 2 inches over surface. Notee ul 489 devices can be used in place of ul 1077.
This is not correct and violates both the nec and ul.
However each motor is protected by a ul1077 supplemental miniature breaker. The major physical diļ¬erence between a ul 489 miniature circuit breaker and a ul 1077 supplementary protector is the required pole spacings. According to ul branch circuit overcurrent protective devices are rated for at least 5 000 amperes interrupting rating and are often rated at a much higher level. Ul 489 versus ul 1077 testing requirements.
