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

[Anonymous user]

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

[BillP]

i am not sure what RCCB is? 😉

[Anonymous user]

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]

oh ok. thanks rau!

i know we have an article here on GFCI.

[Anonymous user · Accepted solution]

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...

[Anonymous user · Accepted solution]

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?

[Anonymous user · Accepted solution]

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.

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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

[Anonymous user]

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

[BillP · Accepted solution]

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]

How is an MCB Connected? In series or parallel?

In series-what happens?

In parallel-what happens?

[BillP]

you want them in parallel

[Anonymous user]

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.