Standard Motor Catalog

Section TR Technical Reference Guide

Table 21: Quick Comparison of NEMA and IEC Enclosure/Cooling Designation

II. MECHANICAL DESIGN FRAME DESIGNATION SYSTEM For footed machines, in NEMA the first 2 digits are taken and divided by 4, the resultant value indicates the height of the shaft center from the ground in inches. A historical reference on how NEMA frame size was reduced over the years can be found at page TR.52 (on ANNEXURE B). For example NEMA Frame 182; has a shaft center height of 18/4=4.5”. For foot-mounted machines, the IEC frame designation system consists of the frame number that indicates the height of the shaft center from the ground in millimeters (mm). For example IEC Frame 112S; has a shaft center height of 112mm. In the Table 20: S, M and L are variations in B (i.e. equivalent to NEMA 2F) dimension; refer to IEC 60072-1 for more details.

IEC Enclosure Codes Protection Cooling

NEMA Enclosures

Drip-proof fully guarded, self-ventilated

IP-22

IC-01

DPFG

Piped Ventilation (Enclosed separately Ventilated, air ducted in and out)

ESV

IP44

IC-37

TENV Totally enclosed non-ventilated

IP44/IP55 IC-410 IP44/IP55 IC-411 IP44/IP55 IC-416 IP44/IP55 IC-416

TEFC

Totally enclosed fan cooled

TEAO Totally enclosed air over frame TEBC Totally enclosed blower cooled

TENV-XP TEFC-XP

TENV, explosion-proof TEFC, explosion-proof

Not defined

DRAINS AND BREATHERS Enclosed Motors (except explosion-proof)

Standard enclosed motor construction includes drain holes in the bottom of the motor. XSD Ultra ® severe-duty motors, special plugs designed to serve as both drains and breathers are inserted into the drain holes. Available as an option is a sintered-metal breather and drain which acts as a one-way vent preventing entrance of contaminants while allowing the moisture to drain out. Explosion-Proof Standard explosion-proof motors are furnished without drains or breathers. Available as an option is the UL listed Crouse-Hinds breather/drain which acts as a one-way vent, preventing the entrance of contaminants while allowing the moisture to drain out. MOUNTING CONFIGURATIONS The following diagrams illustrate the various mounting possibilities for “horizontal” motors in NEMA and IEC.

Table 20: Comparison of NEMA and IEC Frame Designations

IEC 90S 90L 112S 112M 132S 132M 160M 160L 180M 180L NEMA 143 145 182 184 213 215 254 256 284 286

IEC 200M 200L 225S 225M 250S 250M 280S 280M 315S 315M NEMA 324 326 364 365 404 405 444 445 504 505

Additional quick references for major mounting dimension between NEMA and IEC can be found on page TR.51 (ANNEXURE A). ENCLOSURE MATERIAL Frame and endshield materials are listed below in Table 20B. Table 20B Frame Size Enclosure Frame & Endshield Material 143-449 TE* Cast iron or rolled steel 143-449 DP, WPI Cast iron or rolled steel 509-5013 Cast iron

TECHNICAL REFERENCE GUIDE

DP, TEFC, WPI, WPII

182-5013 Explosion-proof

Cast iron Cast iron

143-5013

Severe-duty

*TE: Totally enclosed machines like TENV, TEFC, TEAO, TEBC as applicable.

Figure 26: NEMA Mounting

TR.25

Data subject to change without notice. 03/24 • www.wolongamerica.com