biggladant
Member
- Location
- Kansas
would a manual starter with a lock out device on the stop button be considered a motor disconnect located within sight of the motor?
motor disconnect
- Thread starter biggladant
- Start date
- Status
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: motor disconnect
As long as it opens all of the ungrounded conductors to the motor.
As long as it opens all of the ungrounded conductors to the motor.
joec
Member
- Location
- Lancaster, PA
Re: motor disconnect
I apologize I don't know how to link this but...if you go to www.osha.gov, select 'advanced search, select 'standard interpretations, enter 'std 1-7.3 in 'find in document' block you can scroll down to "motor starter circuits and energy isolation devices".
I apologize I don't know how to link this but...if you go to www.osha.gov, select 'advanced search, select 'standard interpretations, enter 'std 1-7.3 in 'find in document' block you can scroll down to "motor starter circuits and energy isolation devices".
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
Re: motor disconnect
My first thought is yes. My second thought is I seem to recall some kind of requirement that you be able to visually inspect the poles of a disconnecting device for proper function as part of routine maint. I'm not sure you can see the poles open up inside a manual starter.
My first thought is yes. My second thought is I seem to recall some kind of requirement that you be able to visually inspect the poles of a disconnecting device for proper function as part of routine maint. I'm not sure you can see the poles open up inside a manual starter.
electricman2
Senior Member
- Location
- North Carolina
- Occupation
- Retired Electrical Contractor
Re: motor disconnect
How would this be possible if the disconnecting means was a CB?
Re: motor disconnect
This was an issue in the 1999 code cycle that was addressed during proposals I believe it occurred in the tap requirements 430.53for group installations. . Apparently some manual starters are also listed as disconnecting means. If memory serves me, those that are listed would have additional gutter space and be subjected to additional contact testing. It is important to investigate the product you are using to ensure it contains that additional listing. Sorry I'm away from my library
Charlie
This was an issue in the 1999 code cycle that was addressed during proposals I believe it occurred in the tap requirements 430.53for group installations. . Apparently some manual starters are also listed as disconnecting means. If memory serves me, those that are listed would have additional gutter space and be subjected to additional contact testing. It is important to investigate the product you are using to ensure it contains that additional listing. Sorry I'm away from my library
Charlie
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Re: motor disconnect
Note that there is no requirement that it be lockable at all, simply marked "suitable." In fact, Section 403.102 does not require any disconnect, motor or controller, to be lockable as long as at lease one of them is ?in sight? from the motor. The product standards (NEMA & UL)for most acceptable disconnecting means do have a provision for locking but it is not a direct NEC requirement.
- Status