motor controls start/stop stations
- Thread starter jbwhite
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
Re: motor controls start/stop stations
The code does not cover that issue, but in the standard 3 wire start/stop circuit, the start button will not function if the stop button is held in.
Don
The code does not cover that issue, but in the standard 3 wire start/stop circuit, the start button will not function if the stop button is held in.
Don
Re: motor controls start/stop stations
I'm not aware of a particular code section, however, most mfgs. show wiring diagrams with their controllers which call for the stop buttons to be in series. With that in mind, if push comes to shove, one could use 110.3(b)
I'm not aware of a particular code section, however, most mfgs. show wiring diagrams with their controllers which call for the stop buttons to be in series. With that in mind, if push comes to shove, one could use 110.3(b)
GeorgeB
ElectroHydraulics engineer (retired)
- Location
- Greenville SC
- Occupation
- Retired
Re: motor controls start/stop stations
IMHO, sound design practices would not allow energizing the starter with the stop button depressed. I am accustomed to separate control power for MCCs which will allow starter closure with the disconnect pulled. We used auxiliary switches so that logic opened the starter when the disconnect left either position on several jobs.
A slightly separate issue is that many are PLC controlled, and neophyte engineers use NO pushbuttons for everything rather than the NC that should (my VERY STRONG OPINION) be used. A bad or missing input module allows starting, and indeed, prevents stopping the circuit.
IMHO, sound design practices would not allow energizing the starter with the stop button depressed. I am accustomed to separate control power for MCCs which will allow starter closure with the disconnect pulled. We used auxiliary switches so that logic opened the starter when the disconnect left either position on several jobs.
- Status