Difference between thesis research project

old field guy RE: Difference between 460V and 480V regarding... davidbeach (Electrical) 19 Oct 06 11:40 For various historical reasons, we have a situation where 460V is the equipment voltage rating for equipment to be applied to 480V nominal power systems. RE: Difference between 460V and 480V regarding... dpc (Electrical) 19 Oct 06 11:50 The present NEMA standard is to nameplate motors at 460V for operation on a nominal 480V system.  This allows for the unavoidable voltage drop that occurs between the main bus and the motor.

If you look on the nameplate of a nominal 120V appliance or tool, it is most likely rated at 115 V.  Same idea.  

You're OK.   RE: Difference between 460V and 480V regarding... jraef (Electrical) 19 Oct 06 13:39 ANSI standard delineates this. 480V is referred to as the "Distribution Voltage" and 460V is referred to as the "Utilization Voltage". In addition to the other reasons stated above, 460V was chosen by NEMA as the Utilization Voltage for motors because prior to any universal standards, some motors were designed for 440V, some for 460V and some for 480V. You can still see that on old motor nameplates. 460V was the "compromise" that allowed manufacturers to unify their nameplate information without necessarily changing their design.

Same with the other voltages, . 220-230-240 or 110-115-120. 240V is DV, 230V is UV, 220V is old. 120V is DV, 115V is UV, 110V is old. Still to this day however, not every utility follows these standards, but the equipment is all made to work withing the ranges anyway.
Eng-Tips: Help for your job, not for your homework   Read FAQ731-376 RE: Difference between 460V and 480V regarding... BigBadTexOU812 (Computer) (OP) 19 Oct 06 18:45 Awsome.  Thanks to all those who responded.  Greatly appreciated! RE: Difference between 460V and 480V regarding... hlrl (Electrical) 28 Oct 06 00:38 Hi,
Every motor should have its design voltage tolerance.

For my factory, our incoming voltage to the switchboard is 433V, but we always purchased motor that is 415V +/-10% voltage tolerance.
This is mainly to cater for voltage drop.
RE: Difference between 460V and 480V regarding... magneticmaster (Electrical) 2 Nov 06 15:25 480 volts is the system voltage.  460 volts is the rated voltage of your equipment.  460 volt rated equipment is always used on a 480 volt system to account for voltage drop due to starting or line losses.

In any event, you are fine.  No resistors required! Red Flag This Post Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Cancel Red Flag Submitted Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Difference between thesis research project

difference between thesis research project

Media:

difference between thesis research projectdifference between thesis research projectdifference between thesis research projectdifference between thesis research project