wcaseyharman, yes these are single speed motors, and also, I've been trying to get a legend sheet but not successful. These MCC one line drawings are 1998 vintage and I don't have a complete set that includes a legend sheet. This illustrates why an unconventional notation like that should not be...
Edison123 I didn't think that the lower number might be the motor FLA. Have you seen this done before?
I've never seen motor FLA annotated on a one line like that before. If I wanted to show motor FLA on a one line, I would not put it in the circle where you normally put the motor HP. That just...
See this image snipped from an older 480V MCC one line drawing I came across today: img https://res.cloudinary.com/engineering-com/image/upload/v1696424511/tips/480V_MCC_Motor_Load_Notation_vlwwur.jpg]
I've never seen this done before, showing two different motor HP values (5 and 7.2) on the...
I finally got a ruling from Rockwell Allen-Bradley product engineering in Milwaukee, WI. The correct clearing times of the 140G-K, 140G-M and 140G-N with LSI trip units are:
Instantaneous Region:
All 3 have a 60ms clearing time.
Over-Ride Region:
The 140G-K & 140G-M have a 11ms clearing time...
I'm in the New Orleans area.
I agree that the 140G-M TCCs are the same for US and IEC. Allen-Bradley uses the same TCC for both in their documentation. The difference is in the ratings of the IEC version.
I'm not familiar with the ABB Tmax, and my ETAP library doesn't have the ABB Tmax. The...
Thanks very much DPC for giving it a try in EasyPower. I would expect the override to be faster, but I don't think a 0.005 second (5ms) clearing time is possible. Also the Allen-Bradley documentation doesn't show that.
So EasyPower has yet a different interpretation than ETAP and SKM. It seems...
I am having issues with the modeling of Allen-Bradley 140G Series molded case circuit breakers (MCCBs) with electronic trip units (ETUs) in SKM and ETAP software. The issues are with the maximum clearing times of these devices in the fault current region, which is extremely important since it...
