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jjbadski
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Join Date: Apr 2007
Posts: 23

Transfer Switch Conductor Sizing

11/24/2014 9:05 PM

There is two loads being fed from an 800 A automatic transfer switch. One load is a 250 A HVAC Equipment and the other load is a 400 A panel. Can I size the conductors based on the loads or doe the conductors need to be sized for the 800 A?
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Tornado
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Join Date: May 2009
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#1

Re: Transfer Switch Conductor Sizing

11/24/2014 11:14 PM

It depends on local regulations, and on what other circuit protective devices may be present.

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pnaban
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#2

Re: Transfer Switch Conductor Sizing

11/25/2014 12:36 AM

On the loadside if there are CBs with protective devices for each load,no problem But mains should be 800A because you can add another 150A load.

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IdeaSmith
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#3

Re: Transfer Switch Conductor Sizing

11/25/2014 12:36 AM

You could as well ask if the 800 A transfer switch is oversized.

So what do you think it is?

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ade_jkrs
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Join Date: Jun 2014
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#4

Re: Transfer Switch Conductor Sizing

12/05/2014 7:49 PM

Hi,

Conductors serve the load, circuit breakers protect conductors- simple combination. Do you need to size to 800A when your loads demand only 250A and 400A, unless you hv plans for the future, but then again is your power supply sufficient? Only advantage is bigger cables = lower cable impedance = lower losses = electrical savings but higher cable costs.

Regards.
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