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amnajjar
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Join Date: Nov 2009
Posts: 9

Diversity Factor for PCs

03/29/2010 9:15 AM

Hi every one

I have to design (calculate) a cable size for office building has around 50 PC in it.

What diversity factor should apply for this number.

the input power for each is 8 A (Amper).
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msamad
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Location: Houston, USA
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#1

Re: PCs Diversity Factor

03/29/2010 12:27 PM

The PC's will be running all simultaneously during office hours and so there is no diversity of the PC loads. In this case the diversity factor is 1.

Diversity factor: The ratio of the sum of the individual non-coincident maximum demands of various loads (PC's in this case) of the system to the maximum demand of the complete system.

- MS

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bwire
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#2

Re: Diversity Factor for PCs

03/30/2010 12:35 AM

consider about 750VA · 50

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Anonymous Poster
#3

Re: Diversity Factor for PCs

03/30/2010 6:43 AM

For just the pc's I would allow the total to be connected 50 x 8 = 400 amps
because, likely, they will also include some ancillaries; printers, scanners, etc?

In the certain knowledge that only "some" of the pc's will connected all of the
time (unused rooms, absentees, broken, etc) I still think it would be unwise for
the number to be "guesstimated" even on the safe side. e.g. for only 40 pc's ?

This (obviously) is not the limit for the building? (With lighting, heating, etc.?)
Only the pc capacity, which would be powered on various ring circuits anyway?

Not much help, just a penny worth.

jt.

Can I have some more Sir........?
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jt
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Join Date: Jun 2007
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#4

Re: Diversity Factor for PCs

03/30/2010 6:45 AM

Sorry - got logged in as a guest. I'm here to take the rap!

jt.
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jannel
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Join Date: Jan 2010
Posts: 8
#5

Re: Diversity Factor for PCs

03/30/2010 3:49 PM

Question, what type of pc pulls 8 amps?
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JSCadman
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Join Date: Feb 2010
Posts: 16
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#6
In reply to #5

Re: Diversity Factor for PCs

03/30/2010 6:46 PM

That's what I'd like to know also.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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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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#7

Re: Diversity Factor for PCs

04/06/2010 3:27 AM

→ British Standard 7671.

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