QUICK REFERENCE MOTOR DIMENSIONS
The dimensions listed here are intended for reference purposes only. Dimensions shown in the shaded areas will not change from one brand to another for motors built to NEMA rigid base or “C” face mounted dimensional standards. Other dimensions shown are determined by the manufacturer rather than NEMA standards. Those listed are for LEESON® motors and may differ from other brands. Beware of NEMA frame sufﬁx letters other than those listed above as they denote different mounting or shaft dimensions.
For example, sufﬁx letter Y denotes special mounting provisions and Z denotes special shaft dimensions (as in 184TYZ for example). Motors having no sufﬁx letters (other than NEMA frames 42, 48 and 56) are built to prior NEMA standards. Preﬁx letters are often used by manufacturers (as in G184T) to indicate the overall length of a motor but do not denote differences in the NEMA standardized mounting dimensions.
The overall length (“C” dimension) will change with the enclosure, horsepower and speed for the same brand and will vary from one brand to another for motors of the same HP, speed or enclosure. For detailed dimensions of all LEESON motors, go to “products” then “product catalog” on www.leeson.com
* NEMA C face motors also having a rigid base have different BA dimensions in the following instances:
143TC & 145TC – 2 3/4” instead of 2 1/4”
182TC & 184TC – 3 1/2” instead of 2 3/4”
213TC & 215TC – 4 1/4” instead of 3 1/2”
254TC & 256TC – 4 3/4” instead of 4 1/4”
^ XO denotes clearance for the capacitors of single phase motors through the 215T frame. On three phase 254T frame and large motors, T denotes clearance for the lifting eyebolt.
NEMA T FRAME DIMENSIONS
PRIOR NEMA FRAME MTG DIMENSIONS
+ Shaft dimensions of these IEC frames may vary between manufacturers.
~ Horsepower listed is closest comparable rating with similar mounting dimensions. In some instances, this results in a greater HP rating than required. For example, 37KW 4 pole converts to 50HP but nearest HP rating int he NEMA frame having comparable dimensions is 75HP. In these instances, the HP rating printed in black is the direct conversion, and HP printed in blue is the HP of the dimensionally desirable frame. OBSERVE CAUTION if the drive train or driven load is likely to be damaged by the greater HP.
Equivalent HP can be calculated by multiplying the KW rating by 1.341. Multiply HP by .7457 to convert HP to KW.
To convert from millimeters to inches, multiply by .03937
To convert from inches to millimeters, multiply by 25.4
NEMA FRAME ASSIGNMENTS - OPEN & TEFC