IEEE 841-2009

1 Overview
   1.1 Scope
   1.2 Purpose
2 Normative references
3 Service conditions
   3.1 Usual service conditions
   3.2 Unusual service conditions
4 Ratings
   4.1 Basis of rating
   4.2 Frame assignments
   4.3 Voltage and frequency ratings
   4.4 Synchronous speed ratings
   4.5 Enclosures
5 Electrical performance
   5.1 General
   5.2 Motor designs and starting characteristics
   5.3 Power supply variations
   5.4 Insulation system and temperature rise
6 Mechanical features
   6.1 Bearings and lubrication
   6.2 Rotor and shaft
   6.3 Frames, endshields, and fan covers
   6.4 Fans
   6.5 Main terminal boxes and terminal leads
   6.6 Drains
   6.7 Hardware
   6.8 Airborne sound
   6.9 Vibration
7 Corrosion-resistant treatment
   7.1 Frame paint
   7.2 Assembly
   7.3 Exposed internal stator, rotor, and shaft surfaces
   7.4 Miscellaneous
8 Efficiency
9 Tests
   9.1 Test methods
   9.2 Factory tests
   9.3 Additional tests
   9.4 Test information supplied with motor
   9.5 Prototype tests
10 Nameplate
   10.1 Nameplate marking
   10.2 Nameplate material
11 Space heaters - requirements
12 Data exchange - user and manufacturer
Annex A (normative) Prototype motor tests
Annex B (informative) Motor data sheet
Annex C (informative) Bibliography

This standard applies to premium-efficiency totally enclosed fan-cooled (TEFC), horizontal and vertical, single-speed, squirrel cage polyphase induction motors, up to and including 370 kW (500 hp), and 4000 V nominal, in National Electrical Manufacturers Association (NEMA) frame sizes 143T and larger, for petroleum, chemical, and other severe-duty applications (commonly referred to as premium-efficiency severe-duty motors).