[AMPS] 240VAC Amplifier Wiring

[measures]

>
>>
>> 10 gauge wire is too smallish for a 30 foot run for a legal limit amp.
>Look
>> at the voltage at both ends with an 8877 running full output.  Quality of
>> connectors can also be an issue, as well, since that is the point of
>maximum
>> resistance.
>>
>
>#10 is good for 30A (24A continuous)
>
>30A x 240V = 7.2KVA
>
>Approximately = 7,200 Watts
>
>I can't imagine a legal limit amplifier drawing more than that, but will
>accept if they do.
>I have a SB-220 which rated 10 amps @240V = 2.4KVA or Approximately = 2,400
>Watts
>(I don't know what the power factor is)
>
>30A x 100' run on #10AWG CU = 6.9 volts dropped.
>30A x 30' run on #10AWG CU = 2.1 volts dropped.
>240V x 3% (maximum voltage drop allowed by code) = 12V.
>
>Both conditions are well within that allowable per code, and also well
>within a reasonable design practices.  Of course bigger conductors would
>result in less voltage drop, but there is a point of diminishing return.  I
>not saying that it can't be done, I just saying that it does not have to be
>done.  I do not see why any larger feeder than #10AWG CU would be required.
>
>>
>>Lots of home built amps use a standard, electric range "Y" cordset.
>>These have 3 conductors.  Barring assault with a hacksaw, N is at ground
>>potential.
>>
>
>A standard range "Y" cordset was never intended to include a neutral
>connection.  The standard range connection consists of 2 lines and a ground.
>
>The Neutral is only at ground potential at the point where it is bonded with
>the ground.  This is normally done in the main service panel.  The farther
>away from the bonded connection to ground, the higher the likelihood of the
>neutral and ground being different in potential.  This is because any
>unbalanced current and voltage flows on the neutral conductor.  This can be,
>and is caused by, DC Power supplies, Ballast's in Fluorescent lighting,
>inverters, etc.
>
>Also, 10/3 "Romex" NMS (Non-Metallic Sheathed Cable) can only be used in a
>circuit which does not included a Neutral, as the third conductor, a bare
>conductor, is intended to be used as the equipment grounding conductor.
>
>73,
>Eric
>K8CCA
>
>
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>
>


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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