Thursday, October 3, 2013

Voltage drop in electric cables

Posted by Sikandar khan  |  at  11:31 PM No comments

The voltage drop in a whole circuit always remains in permissible limit. I.E.E regulation states that the drop in voltage from the consumer's terminals to any point in the installation shall not exceed 2.5 percent of the declared supply voltage. When we use low resistance conductors cable, this problem is not produced. Since every cable has a definite resistance, then there is always a volt drop along a cable is occurred.'
For short run of cables, the value of volt drop is minimum, therefore it is neglected, but with long routes of cable the volt drop can become an important factor.
For example:
                           Declared supply voltages = 230 V
    Maximum permissible volt drop = 230/100 x(*) 2.5
                                                                           = 5.75 V
For a 250 V
Maximum permissible volt drop = 250/100 x(*) 2.5 =6 V

As there is also a volt drop occurred in wiring from D.F.B to various sub-circuits points, the value of the volt drop should be about half of the above value i.e 3 volts.

About the Author

Sikandar khan is pro blogger who's write about technology,learn Home wiring. He makes video tutorial in Urdu and Hindi languages

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