Industrial Automation Terms You Should Know

N

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. Listed explosion-proof motors. The skin temperature shall not exceed the minimum ignition temperature of the substances to be found in a 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 SurfaceDegrees FT-Codes ID
Numbers
U/L Requirement
for Class & Group
450842T1
300572T2
280536T2AClass I Group D w/Cautionary Label
260500T2B
230446T2C
215419T2DClass I Group D
200392T3Class ll Group E & F
180356T3AClass I Group C w/Cautionary Label
165329T3BClass ll Group G
160320T3CClass I Group C
135275T4
120248T4A
100212T5
85185T6



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

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