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Author Topic: Did I reach the limit of how many machines I can run at my apt?  (Read 3263 times)
kjj
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May 23, 2011, 02:22:16 PM
 #21

Minor heads up, most 15A circuits aren't able to pull an 1800w load. 15A is not the continuous load that the wiring and cb are rated for. 12A is...meaning you get 1440 watts max on a continuous load.

Wtf?   Shocked  Huh

If this was true, houses would burn down and need to be rebuilt every couple of months.  Eventually, people would figure out the problem and start putting 12 amp breakers in, or wiring capable of actually handling 15 amps.  Oh, wait, we picked option 2 decades ago.

Watts isn't a meaningful term for talking about AC circuits, except that it is usually sorta close.  The real amount of power that a circuit can deliver is measured in Volt-Amps.  A 15 amp circuit can handle 1800 VA nominally, but if your voltage it is amperage that trips the breaker, not power, so if your voltage is low, you won't get as much power.

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bobR
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May 23, 2011, 02:30:14 PM
 #22

Minor heads up, most 15A circuits aren't able to pull an 1800w load. 15A is not the continuous load that the wiring and cb are rated for. 12A is...meaning you get 1440 watts max on a continuous load.

Wtf?   Shocked  Huh

If this was true, houses would burn down and need to be rebuilt every couple of months.  Eventually, people would figure out the problem and start putting 12 amp breakers in, or wiring capable of actually handling 15 amps.  Oh, wait, we picked option 2 decades ago.

Watts isn't a meaningful term for talking about AC circuits, except that it is usually sorta close.  The real amount of power that a circuit can deliver is measured in Volt-Amps.  A 15 amp circuit can handle 1800 VA nominally, but if your voltage it is amperage that trips the breaker, not power, so if your voltage is low, you won't get as much power.

Wattage is volts times amps
that 80% rule is for continuous draw... the breaker trips at the %100 value
Go back to school please
kjj
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May 23, 2011, 02:44:47 PM
 #23

Wattage is volts times amps
that 80% rule is for continuous draw... the breaker trips at the %100 value
Go back to school please

DC wattage is voltage times amps.

AC wattage is voltage times amps times the power factor.

The 80% thing is a design rule that an electrician has to follow if he wants the wiring to pass inspection.

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mewantsbitcoins
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May 23, 2011, 02:48:24 PM
 #24

No, I have a bigger dick
bobR
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May 23, 2011, 03:21:26 PM
 #25

Wattage is volts times amps
that 80% rule is for continuous draw... the breaker trips at the %100 value
Go back to school please

DC wattage is voltage times amps.

AC wattage is voltage times amps times the power factor.

The 80% thing is a design rule that an electrician has to follow if he wants the wiring to pass inspection.

The 80% rule has nothing to do with electricians or passing inspection
that is the design of a circuit breaker

electricians have rules as to wire size ... number of fixtures/outlets ... size of breakers
they must follow

yes ac wattage includes PF .. do you have any clue what power factor is
kjj
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May 23, 2011, 03:45:30 PM
 #26

No, I forgot to read that article I linked, but I found another that you might like.

I'm done.

To the original poster: please don't burn your apartment building down.

p2pcoin: a USB/CD/PXE p2pool miner - 1N8ZXx2cuMzqBYSK72X4DAy1UdDbZQNPLf - todo
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inh
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May 23, 2011, 05:23:14 PM
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smooth
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May 23, 2011, 05:33:04 PM
 #28

AC wattage is voltage times amps times the power factor.

Most of the decent PSUs people should be using for mining have 99% PF
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