will high power trip my fuse?
- Thread starter bonzo75
- Start date
I doubt it. The only question I would have are they dedicated lines? I have two monoblocks with 25 amp breakers fed with two 20 amp circuits and have never tripped the line breakers. Though my speakers are about 94 db sensitivity.
If you're using a standard 13A fuse in your plug then you'll be certainly be "close" at a nominal wall voltage of 230V (even though London voltage is often closer to 240) since I=P/V=2400/230=10.4A.
If the amp is actually outputting 2400W into 1 ohm, then the chances are it's sucking a fair bit more than that from the wall as no amps are 100% efficient. So yeah, it probably will blow a fuse in your plug at those levels. Will it trip the fuseboard? Probably not if its a 20A circuit, although I wouldn't be boiling a kettle in your listening room at the same time. FWIW I regularly blew 5A fuses in my power cables with a Krell KSA 80, although that was due to a switch-on surge.
If the amp is actually outputting 2400W into 1 ohm, then the chances are it's sucking a fair bit more than that from the wall as no amps are 100% efficient. So yeah, it probably will blow a fuse in your plug at those levels. Will it trip the fuseboard? Probably not if its a 20A circuit, although I wouldn't be boiling a kettle in your listening room at the same time. FWIW I regularly blew 5A fuses in my power cables with a Krell KSA 80, although that was due to a switch-on surge.
Before you would change the size of breaker,consult a electrician. The size of the wiring dictates the limit of the breaker size. In the U.S. #10 wire can be used for a 30 amp breaker
If his amp is putting out 2400w then it's drawing a lot more than that. I'd say it's thermally limited sooooooooooooooooooooooooooooooo far before it hits that much output for more than a blip of whatever juice the capacitors can hold. Class A output can easily be as bad as 1 to 10. That's 1w for 10w spent. It's basically impossible for mortal sized heatsinks to allow that to happen long enough to trip a breaker. Plus his transformer will have a thermal meltdown.
Whatever the manufacturer says your amp is rated at, use that. Any manufacturer worried about tripping a breaker will add a soft-start to the amp since a dead-turn-on is the only time it draws as much current as possible since the caps are all the way drained and thermal limiting isn't an issue.
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Symphonic line Kraft, used. The options in terms of 1 ohm ability and budget are that, Krell old FPB, Gryphon colosseum. All used
Speaking of tripping 13A fuses I never realised this until recently. The standard BS1362 13A fuse will happily conduct 20A of current continuously without tripping and will handle a hell of a lot more for shorter bursts. See here:
http://www.pat-testing-training.net/articles/fuse-operation-characteristics.php
Guillaume
http://www.pat-testing-training.net/articles/fuse-operation-characteristics.php
Guillaume
News to me too, Guillaume. I take back my earlier comments.
However, all this has me wondering how I managed to blow fuses in 3 or 4 power cables over the summer. Maybe just as well I no longer have that old Krell!
However, all this has me wondering how I managed to blow fuses in 3 or 4 power cables over the summer. Maybe just as well I no longer have that old Krell!
A Class 'A' amplifier outputting 2400 audio Watts will require some very large fuses and a large air conditioning system.
Why not get a "Kill-a-Watt" (or similar) AC line meter and measure what's really happening?
Why not get a "Kill-a-Watt" (or similar) AC line meter and measure what's really happening?
Of course you know that these amps aren't Pure Class A designs, they operate in Class A only at 8 ohms and it's Class AB at anything less. Given your choice of speakers 4 ohms is already a stretch
! Also given the chassis size and operating temperatures of two of these amps I'm highly suspicious of their 300 watt Class A claims even at 8 ohms, that's why I asked earlier about the amps. david
Of course you know that these amps aren't Pure Class A designs, they operate in Class A only at 8 ohms and it's Class AB at anything less. Given your choice of speakers 4 ohms is already a stretch
david
Yes, which is in my first post I said the class A at 1 ohm will be 37.5, as it keeps halving
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