Re: AlphaServer hardware question

From: Nic Clews (sendspamhere_at_[127.0.0.1)
Date: 06/25/04

  • Next message: news1.ns.sympatico.ca: "Couple noob questions" 
    Date: Fri, 25 Jun 2004 10:16:01 +0100

    TANSTAAFL wrote:
    >
    > I have a fully loaded AlphaServer 2100A RM. The documentation says
    > only one power supply is need to support a fully configured server.
    > This one has a second one for n+1 redundancy.
    >
    > Each power supply handles 120V with a maximum current of 10A. Both
    > power supplies will be supported by the same circuit. If the
    > consumption would not exceed one the capability of one power supply, I
    > do not need a 20A circuit right?

    Arguably you are correct.

    The power supplies are switching, so basically, if one supply draws 10A,
    then two will share the load and draw just 5A each. There is some small
    overhead of course because it is not 100% efficient.

    HOWEVER, lets talk electrics. NEVER NEVER expect to constantly draw the
    rated current load from wiring. This is the way to electrical fires. The
    supply should have at least *double* the expected maximum total current
    draw for the circuit, ideally 2.5 times. In the UK this is backed up
    with a ring type circuit for multiple connections.

    In your case, I would have a 32A breaker, and wiring cable of carrying
    40A plus, the breaker must ALWAYS act lower than the total capacity of
    the wiring.

    So in your case, lets say your system develops an electrical fault, and
    tries to draw 20A. What would happen? Would a breaker or fuse trip at
    less than 20A? Or would the wiring go into meltdown and overheat?

    That is what you need to be concerned with. 

    -- 
Regards, Nic Clews a.k.a. Mr. CP Charges, CSC Computer Sciences
nclews at csc dot com
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