Motor Disconnecting Means

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czars

Czars
Location
West Melbourne, FL
Occupation
Florida Certified Electrical Contractor
I have a client that wants to power a 5 HP motor-generator set from the service panel in his home. If the motor-generator and the driven load are within sight of the service panel, can the circuit breaker supplying power to the motor-generator be used as the motor disconnecting means or is a separate disconnecting means required?
 

iwire

Moderator
Staff member
Location
Massachusetts
As long as you meet this definition, yes.


In Sight From (Within Sight From, Within Sight).
Where this Code specifies that one equipment shall be “in
sight from,” “within sight from,” or “within sight of,” and
so forth, another equipment, the specified equipment is to be
visible and not more than 15 m (50 ft) distant from the other.
 

GoldDigger

Moderator
Staff member
Location
Placerville, CA, USA
Occupation
Retired PV System Designer
Just for clarification, is there going to be motor starter that includes overload protection downstream somewhere, or will the CB be the only overcurrent/overload protection?
It can be the disconnect, but it cannot be the only motor protection (unless the motor includes integrated protection.
If the motor is three phase, it would be desirable to include phase loss protection of some sort.
 

kwired

Electron manager
Location
NE Nebraska
Possibly need to clarify exactly what this "motor-generator" is. If it is indeed a motor driving a separate generator then most of the advice given so far is good. If it is a rotary phase converter some of the advice may still be good but comes from art 455 and not 430.
 
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