[sdiy] one AC input for two power supplies ?

[Scott Gravenhorst]

harrybissell <harrybissell at prodigy.net> wrote:
>One switch, one line cord, two fuses (one for each power supply) would
>be best.
>
>Since the power supplies are different sizes, they should not share one
>AC line
>fuse.

I don't see why their size difference has much to do with it.  Say you have 2
supplies, each identical and capable of 5 amperes.  If they are wired in
parallel to a single 10 amp fuse and one is only drawing .5 amps, the other can
fail and draw 9.5 before the fuse blows, which could easily mean smoke and
flames.  Best rule of thumb seems to be fuse each supply separately.  They can
share a common switch and line cord, just not the fuse.

>H^) harry
>
>Peng wrote:
>
>> I'll try to clarify:   I have one Power One +/-15 volt supply for
>> VCOs,VCFs,VCAs. I have a smaller power supply for the trigger
>> generators,EGs, and all kinds of other stuff. The two power supplies
>> each have their own distribution board. Now, from the transformer, I
>> connect to a fuse then a switch then to a three prong socket,  then a
>> typical power cord plugged into wall. That's how the first power
>> supply is hooked up. For the second one, do I need a seperate switch
>> and three prong socket (not talking about the wall plug here) ? I want
>> them to share the same switch and AC plug since the two supplies will
>> always be used at the same time.  thanksP.
>>
>> harrybissell <harrybissell at prodigy.net> wrote:
>>
>>      as in wall socket ?
>>
>>      If you don't exceed the circuit breaker current (typ 15-20A)
>>      you're
>>      fine.
>>
>>      very unlikely your power one supples are THIS big ?
>>
>>      (or maybe I did not understand your question)
>>
>>      H^) harry
>>
>>      Peng wrote:
>>
>>      > I have two Power one supplies for my modules. Can I use
>>      the same AC
>>      > socket for both supplies. thanks,P.
>>      >
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