UTS10BI and circuits 9 & 10

[dBeau_apc]

This was originally posted on APC forums on 11/15/2011

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On the UTS circuits 9&10 work together to power a 240v load... great. But what if you dont have a 240v load to be powered, do you lose the use of these circuits? Can they be used to power a small sub-panel feeding a couple of 120v loads? In other words, does the UTS10BI care about the load balance between the legs of this 240v circuit? ...or can 9 & 10 be used independently each powering separate 120v loads?

[codename47_apc]

This was originally posted on APC forums on 11/17/2011

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I was planning on running a 240 subpanel because I have no 20 amp 240 loads in the breaker. I don't see why the uts would care what it powers as long as the main is sending power to a 240 2 pole breaker and the uts is connected using the 9 and 10 in/out wire. That is my take from the manual.
I hope that logic holds true and I can use the subpanel to power a 240 outlet in the garage and 120 connection to a battery charger.

[BillP]

This reply was originally posted by Angela on APC forums on 11/16/2011

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9 and 10 must be two 120v circuits and they are required to power the UTS itself since it runs off of 240v. the user's guide states: Together, circuits 9 and 10 form a dedicated 240 V circuit. DO NOT use these circuits as individual 120 V circuits.

http://www.apcmedia.com/salestools/ASTE-6Z7VBL_R0_EN.pdf

PDF pg 6.

[dBeau_apc]

This was originally posted on APC forums on 11/17/2011

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Together, circuits 9 and 10 form a dedicated 240 V circuit. DO NOT use these circuits as individual 120 V circuits.

...and that's the source of the original question. So to rephrase: is a 20a 240v sub-panel a dedicated 240v circuit?

[BillP · Accepted solution]

This reply was originally posted by Angela on APC forums on 11/17/2011

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i checked on this and was told the 20A 240v subpanel should be okay.

[dBeau_apc]

This was originally posted on APC forums on 11/17/2011

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i picKed a winna wrote:i checked on this and was told the 20A 240v subpanel should be okay.

Thank you. That's good to know.

[KyeLee_apc]

This was originally posted on APC forums on 10/23/2012

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This sounds like dumb question but I am not an electrician and don’t know much about this kind of stuff but I have questions.

I purchased APC Transfer Switch about a month ago and installed by local electrician.
When he install the unit, we used all 10 circuits include circuit 9 and 10. Where circuit 9 is 120V/15A Bed Rm 2 and 10 is 120V/15A garage. According to him, he reverse the phase between 9 and 10 to have 204V for circuit 9 and 10.

The 10 circuits that we have connected are;
1. Sump pump – 20A
2. Kitchen – 20A
3. Family Rm – 20A
4. Dinning Rm – 15A
5. Rec Rm – 15A
6. Master Bed Rm – 15A
7. Study Rm – 15A
8. Bed Rm 1 – 15A
9. Bed Rm 2 – 15A
10. Garage – 15A

This is OK?

[BillP]

This reply was originally posted by Angela on APC forums on 10/23/2012

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this is not good. it should be a dedicated 240 circuit required in order to power the UTS. you may run into issues with this, you may not since its designed or tested like this. i would advise that it be set up properly with a dedicated 240v circuit.

[Boatingrtb_apc]

This was originally posted on APC forums on 10/27/2012

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I'm a consumer and not an expert, but my view point from my testing, as long as your bedroom 2 & garage circuits are on opposite legs of the main panel (which you say they are as 240v) and are set to trip together, you should be ok.

The problem comes (in my personal testing is) when the CB's tied to UTS 9 & 10 don't trip together. These two appear to tell the UTS if the main power is out. If only one is tripped, the UTS throws a error.

Make sure your bedroom 2 & garage circuit breakers are next to each other (like CB 1 & 3 for example) and that they are using a 240v breaker or are at least tied together with a tie bar so if one trips, they both trip.

My 2 cents.

-Todd

My advise is from my testing and observations only