(hp)
1) NEMA Design B, Single Speed 1200, 1800, 3600 RPM. Open Drip Proof (ODP) or Totally Enclosed Fan Cooled (TEFC) motors 1 hp and larger that operate more than 500 hours per year.
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
Typical electrical motor data like nominal current, fuse, start ampere, size of contactor and circuit breaker - for asynchronous induction motors.
The measure of usefulness.
Efficiency is the ratio useful energy output to energy input.
Friction and efficiency in bearings and roller chains.
Calculate amps, hp and kVA for electrical motors.
480V electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp.
Calculate electric motor efficiency.
Calculate electric motor efficiency.
Operating speed of an induction motor depends on the input power frequency and the number of magnetic poles in the motor.
Electrical motors NEMA frame dimensions.
Heat loss from an electrical motor to the surroundings.
Electrical motors horsepower rating vs. their ampere rating.
Electrical motors NEMA temperature and insulation classes.
NEMA locked rotor indicating code letters for electrical motors.
Service factor - SF - is a measure of periodically overload capacity at which a motor can operate without beeing damaged.
Speed of an operating electrical motor with load is lower than the synchronous speed (no load) of the motor.
The speed of electrical motors with 2, 4, 6 or 8 poles at 50 Hz and 60 Hz.
Direct-on-line starters, star-delta starters, frequency drives and soft starters.
Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.
National Electrical Manufacturers Association.
NEMA has established the four different designs A, B, C and D for electrical induction motors.
Increased voltage imbalance and decreased efficiency.
Power equations for single phased electrical systems.
Full load amps, wire and conduit sizes for three phase electrical motors.
Electrical 3-phase equations.
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