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Jenyam
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Join Date: Jun 2015
Posts: 8

Over-Current Protective Device

06/18/2015 4:00 AM

can you somehow help me with my confusion...? what is really the demand and safety factor in computing the main over-current protection in 3phase system and in 1phase system?
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RAMConsult
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Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#1

Re: Over-Current Protective Device

06/18/2015 1:26 PM

Exactly what is required by the local codes and standards where the installation is planned for. You can learn how the numbers were chosen by reading and understanding those documents. If you don't read them now your lawyers will be reading them in the future.

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Jenyam
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Join Date: Jun 2015
Posts: 8
#4
In reply to #1

Re: Over-Current Protective Device

06/23/2015 4:50 AM

thank you very much sir...
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#2

Re: Over-Current Protective Device

06/18/2015 4:28 PM

That which is determined by the wiring dimensions and characteristics, including the method of installation, of course.

In the UK, one can find full protocols in British Standard 7671.

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V.I.Abraham
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Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
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#3

Re: Over-Current Protective Device

06/22/2015 1:59 PM

The demand factor is a contractual agreement with the contracting company and Electricity consumer and if the consumer cross the maximum demand agreed up on, penalty is imposed by the Electricity supplying company. The maximum demand Meter is installed by the supply company.

Safety is the factor to be followed by any Electricity user and the factor is set by the Government or its authorised department or agency . Normally there are set safety rules to be followed
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Jenyam (1); PWSlack (1); RAMConsult (1); V.I.Abraham (1)

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