Sizing breaker

[Sparky125]

I have a 3-phase, 208V dust collector with a nameplate indicating a full load current (FLA) of 23.8 amps. Should I apply the 125% rule, which brings it to 29 amps? In that case, would I use a 30-amp breaker, or should I size up to a 40-amp breaker?

 

[ptonsparky]

The NEC has a nice chart near 430.2 (same page) that shows you where to look.
You need to determine what you are looking for.
Are you looking for Part IV?
or
Part III?

 

[infinity]

I have a 3-phase, 208V dust collector with a nameplate indicating a full load current (FLA) of 23.8 amps. Should I apply the 125% rule, which brings it to 29 amps? In that case, would I use a 30-amp breaker,

That's what I would do. If it's just a motor than different rules apply as far as the OCPD size when compared to a piece of equipment.

 

[Sparky125]

I have a 3-phase, 208V dust collector with a nameplate indicating a full load current (FLA) of 23.8 amps. Should I apply the 125% rule, which brings it to 29 amps? In that case, would I use a 30-amp breaker, or should I size up to a 40-amp breaker?

That's what I would do. If it's just a motor than different rules apply as far as the OCPD size when compared to a piece of equipment.

Sorry Im not understanding. It is a 3 phase motor? Or is it not.

 

[Ohm2]

I have a 3-phase, 208V dust collector with a nameplate indicating a full load current (FLA) of 23.8 amps. Should I apply the 125% rule, which brings it to 29 amps? In that case, would I use a 30-amp breaker, or should I size up to a 40-amp breaker?

Are you trying to determine your overload protection or Short and ground fault protection?

Sorry Im not understanding. It is a 3 phase motor? Or is it not.

looks like you said it was a 3-ph motor.