Posts Tagged ‘voltage drops’

Asynchronous motor starting system

February 3rd, 2017 | Make a comment | Posted in Energy Efficiency - motors
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megaphone-redNew guest article today by A.N. abotu motor starting systems. If any remarks or questions are welcomed, write a comment below.

The asynchronous motors are used for a wide range of applications. They are used in industrial processes, commercial buildings, recreational areas, at home, and other areas.

However, if motor is switched on directly from the mains supply, it draws a very high initial current. The current at startup is usually between five and seven times what the motor normally draws at full load, but only develops a torque of between 1.5 and 2.5 times the torque at full load.

How to minimize voltage drops? – 4 practical guidelines

July 15th, 2015 | Make a comment | Posted in Power quality
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journal1Hi everybody, it’s Steven Mill. Hope you’re enjoying your holidays.

I’ve personally been thinking about some topics to deal with on the blog and I thought about the one I’ve published in 2014 (September) about the inspection of voltage drop in conductors.

So today I want to go further and post 4 guidelines in order to help my fellows engineers. Enjoy!

According to NEC, a three percent voltage drop in branched circuits, and five percent voltage drop in feeders connected to branched conductors, will not to create major problems as far as energy efficiency and operation of general circuits is concerned.

But, a voltage drop greater than the indicated percentage (5%), can hamper the life as well as the operational efficiency of electrical circuits and equipment. In an attempt to minimize the voltage drops and keep them below 5%, a few practical guidelines are to be followed.

Below mentioned are the four practical guidelines, following which, voltage drops can be considerably minimized:

  • Increasing the number of the conductors or their size
  • Reducing the power load
  • Decreasing the length of the conductor
  • Decreasing the temperature of the conductor


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