Motor Finder:    

Electric Motors Store - Glossary

N - Terms

|A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | R | S | T | U | V | W |


NAMEPLATE
The plate on the outside of the motor describing the motor, HP, voltage, RPM's, efficiency, design, enclosure, etc.

 
NAVY SERVICE "A"
Motors designed to meet requirements of MIL M-17059 or MlL M-17060 for high shock and service and are essential to the combat effectiveness of a ship. These motors are usually made of nodular iron.

 
N.E.C. TEMPERATURE CODE ('T' CODE)
An index for describing maximum allowable "skin" (surface) temperature of a motor under any normal or abnormal operating conditions. The "T" codes are applicable to U.L. Iisted explosion-proof motors. The skin temperature shall not exceed the minimum ignition temperature of the substances to be found in the hazardous location. The "T" code designations apply to motors and other types of electrical equipment subject to hazardous location classification.

 
SKIN TEMPERATURE IDENTIFICATION NUMBERS

 

Maximum Surface Degrees F T-Codes ID
Numbers		 U/L Requirement
for Class & Group
450 842 T1 Not Available Reliance Product
300 572 T2 Not Available Reliance Product
280 536 T2A Class I Group D w/Cautionary Label
260 500 T2B Not Available Reliance Product
230 446 T2C Not Available Reliance Product
215 419 T2D Class I Group D
200 392 T3 Class ll Group E & F
180 356 T3A Class I Group C w/Cautionary Label
165 329 T3B Class ll Group G
160 320 T3C Class I Group C
135 275 T4 Not Available Reliance Product
120 248 T4A Not Available Reliance Product
100 212 T5 Not Available Reliance Product
85 185 T6 Not Available Reliance Product



NEMA
The National Electrical Manufacturers Association (http://www.nema.org) is a non-profit organization organized and supported by manufacturers of electric equipment and supplies. NEMA has set standards on:

  • H.P. ratings
  • speeds
  • frame sizes and dimensions
  • standard voltages and frequencies with allowable variations
  • service factors
  • torques
  • starting current & KVA
  • enclosures

 
Reliance Electric is one of the founding members of NEMA.

 
NEMA I
See Weather protected machine, Type I

 
NEMA 11
See Weather protected machine, Type 11

 
NODULAR IRON (DUCTILE IRON)
Special cast iron with a crystalline formation which makes it capable of handling high shock.