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what is the proper way to connect the RCCB to the UPS.

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

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blackAces_apc
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what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/17/2009


Hi all

I need your expert advice, what is the proper way to connect the RCCB to the UPS, coz im ask some supplier of RCCB they have defferent version on how to install the RCCB.
They told me that from:
1. Main Supply -> RCCB -> UPS -> Load or/
2. Main Supply -> UPS -> RCCB -> Load
I really dont know what is the proper way, BTW the RCCB rating is 30mA and it should be connected/ install to the server rack...

Need you advice

Thanks to all

Message was edited by: black Aces


Accepted Solutions
rau_apc
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984

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/17/2009


The wall receptacle GFI is not available in my country, I've never seen one here nor those portable ones available in the US. Where you usually see GFCIs installed here is in the cicuit breaker panels, one for all circuits or one or more for circuits feeding external areas, areas where water is close to the circuits that people tend to use electrical appliances, and in bathrooms. In my house I have one three phase + neutral RCD that protects all circuits and we never had any problem with it...

See Answer In Context

blackAces_apc
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984

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/18/2009


so if you say that the RCCb is connected before the UPS, FYI the rating of the RCCB is 30mA then what if my UPS input current rating above/ or 5Amps, basically the RCCB will keep on triping right?

See Answer In Context

rau_apc
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985

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/18/2009


No, it's not gonna keep tripping because of the 30mA rating, you're making some confusions here.

The rating given in miliamps, mA, is the number at which the RCCB will trip in case electricity leaks to earth, or ground as the americans say. If a person get shocked or there is a fault inside an equipment that causes it to leak current to earth, the RCCB will trip, thus protecting the electrical installation itself and mainly, the user of that piece of equipment.

If you look at the data written in front of RCDs you'll see its nominal amperage rating, which can be 10A, 25A, 40A, 63A, 80A, 100A, you see its sensitivity rating (the amount of leakage current that make the RCD trip) given in mA, 30mA, 100mA, 300mA, 500mA. There are also other stuff written there like the maximum current that the device is capable of handling when it turns itself off without breaking the device like, 6000A, 10000A and sometimes the schematics of how you plug the device comes printed in front of it as well along with other information like the voltage rating, etc.

-------------

Let me correct something. An RCCB DO NOT work as a normal circuit breaker as I said before, it works only as a leakage current protector or earth fault protector. An RCBO is the one that works as a normal circuit breaker and an earth (ground) fault detector on the same product.

The "ln" rating, or the nominal current of an RCCB only indicates the maximum continous current the device can handle, but it won't trip in the case of short circuit or overload, it will only trip on leakage current faults!

An RCBO trips if one of the three problems occur: Overload, Shot-Circuit and Leakage current.

Message was edited by: rau

See Answer In Context

BillP
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986

How is an RCCB Connected:In series or parallel?

This reply was originally posted by aruna on APC forums on 1/10/2012


Dear friends,

Could you pls share your comments on the RCCB-Connected in series-what happens?-?Connected in Parallel-what happens?

Share your comments pls!!

See Answer In Context

11 Replies 11
BillP
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983

Re: what is the proper way to connect the RCCB to the UPS.

This reply was originally posted by Angela on APC forums on 6/17/2009


i am not sure what RCCB is? 😉

rau_apc
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Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/17/2009


RCCB is basically the "american" GFCI.

RCCB is the short for: Residual Current Circuit Breaker it works as a GFCI and a normal Circuit Breaker in one product. It's one of the many types of RCD - Residual Current Devices. In Brazil we call it DDR or IDR.

The RCCB should be installed before the UPS in the Circuit Breaker panel also known as "consumer unit" in the UK.

An UPS should never make RCDs trip, if it causes it to trip, it means the leakage current inside the UPS is very high and something is not working properly.

BillP
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983

Re: what is the proper way to connect the RCCB to the UPS.

This reply was originally posted by Angela on APC forums on 6/17/2009


oh ok. thanks rau!

i know we have an article here on GFCI.

rau_apc
Commander
Commander
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0
985

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/17/2009


The wall receptacle GFI is not available in my country, I've never seen one here nor those portable ones available in the US. Where you usually see GFCIs installed here is in the cicuit breaker panels, one for all circuits or one or more for circuits feeding external areas, areas where water is close to the circuits that people tend to use electrical appliances, and in bathrooms. In my house I have one three phase + neutral RCD that protects all circuits and we never had any problem with it...

blackAces_apc
Commander
Commander
0 Likes
0
985

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/18/2009


so if you say that the RCCb is connected before the UPS, FYI the rating of the RCCB is 30mA then what if my UPS input current rating above/ or 5Amps, basically the RCCB will keep on triping right?

rau_apc
Commander
Commander
0 Likes
0
986

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/18/2009


No, it's not gonna keep tripping because of the 30mA rating, you're making some confusions here.

The rating given in miliamps, mA, is the number at which the RCCB will trip in case electricity leaks to earth, or ground as the americans say. If a person get shocked or there is a fault inside an equipment that causes it to leak current to earth, the RCCB will trip, thus protecting the electrical installation itself and mainly, the user of that piece of equipment.

If you look at the data written in front of RCDs you'll see its nominal amperage rating, which can be 10A, 25A, 40A, 63A, 80A, 100A, you see its sensitivity rating (the amount of leakage current that make the RCD trip) given in mA, 30mA, 100mA, 300mA, 500mA. There are also other stuff written there like the maximum current that the device is capable of handling when it turns itself off without breaking the device like, 6000A, 10000A and sometimes the schematics of how you plug the device comes printed in front of it as well along with other information like the voltage rating, etc.

-------------

Let me correct something. An RCCB DO NOT work as a normal circuit breaker as I said before, it works only as a leakage current protector or earth fault protector. An RCBO is the one that works as a normal circuit breaker and an earth (ground) fault detector on the same product.

The "ln" rating, or the nominal current of an RCCB only indicates the maximum continous current the device can handle, but it won't trip in the case of short circuit or overload, it will only trip on leakage current faults!

An RCBO trips if one of the three problems occur: Overload, Shot-Circuit and Leakage current.

Message was edited by: rau

blackAces_apc
Commander
Commander
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986

Re: what is the proper way to connect the RCCB to the UPS.

This was originally posted on APC forums on 6/20/2009


ah okies, thank you Rau your info is a big help for those people dont have much knowldge like me about this things....:-)

BillP
Administrator Administrator
Administrator
0 Likes
0
987

How is an RCCB Connected:In series or parallel?

This reply was originally posted by aruna on APC forums on 1/10/2012


Dear friends,

Could you pls share your comments on the RCCB-Connected in series-what happens?-?Connected in Parallel-what happens?

Share your comments pls!!

BillP
Administrator Administrator
Administrator
0 Likes
0
986

How is an MCB Connected:In series or parallel?

This reply was originally posted by aruna on APC forums on 1/10/2012


How is an MCB Connected? In series or parallel?

In series-what happens?

In parallel-what happens?

BillP
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Administrator
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985

Re: How is an RCCB Connected:In series or parallel?

This reply was originally posted by Dakota on APC forums on 1/11/2012


you want them in parallel

blackAces_apc
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985

Re: How is an MCB Connected:In series or parallel?

This was originally posted on APC forums on 12/14/2012


will as per advise we connect the RCCB in series ( a ground conductor ), we found out also that there's nothing wrong with the UPS, it more on the balancing the mains supply.