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Discuss Testing of an RFC linked to a UPS in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. polo1
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    polo1 Electrician's Arms

    Location:
    Glasgow
    Business Name:
    GW Electrical & Security
    Hi all,
    bit of advice please - as the title, I have been asked to test a RFC which is served by a UPS. It's in an alarm receiving center. Any advice on what I need to watch out for, testing protocols etc? Not workred on this kind of set up before.

    Regards.
     
  2. Golden_Boy
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    Golden_Boy Electrician's Arms

    Location:
    County Durham
    If the rfc is fed by a UPS then in practice it is not part of the fixed wiring..As the ups output will not be connected to the input circuit in any way.

    As it is NOT connected to the input I would think that the RFC should be treated as if it where being fed from an isolation transformer and treated accordingly !!?

    I may be wrong though..................
     
  3. Knobhead
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    Knobhead Guest

    Sounds reasonable to me. Totally isolated from the main system.

    You say a data centre, so you need to start looking at the implications of an “isolated” earth returns within your “isolated” system.
     
  4. Golden_Boy
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    Golden_Boy Electrician's Arms

    Location:
    County Durham
    The whole system may be "earth free" of course!!!
     
  5. polo1
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    polo1 Electrician's Arms

    Location:
    Glasgow
    Business Name:
    GW Electrical & Security
    Thanks guys. I'll also reseach UPS generaly to see what's on the web.

    Regards.
     
  6. IQ Electrical
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    IQ Electrical Trusted Advisor


    Carry out your usual tests with the UPS in bypass mode.

    When the inverter is in operation, the UPS itself will be factory set to clear any fault downstream, usually allowing a fault current to flow for around 100mS before automatically shutting down to protect the inverter.
     
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