Jeg har jo de to kabler over loftet. Hvis vi nu tager det, at de er 15 meter hver, så skal det regnes som 30 meter for hver.
Kabelresistensen = 0,0175 x længde/ areal.
x 30 = 0,525.
Det tal skal divideres med kvadrat, så hvis man brugte et tyndt kabel på 1,5 kvadrat ville det have 0,35 ohm.
2,5 kvadrat ville give 0,21 ohm.
5 kvadrat ville give 0,105 ohm.
6 kvadrat ville give 0,0875 ohm.
10 kvadrat ville give 0,0525 ohm.
Improving your listening room, by Vince Galbo, skriver ved wiring ved 230 volt, "The
220 volt outlet can be a standard 15 amp with 10 Ga.. Wire up to 80 feet then 8 gauge beyond that."
Dette er om
120 volt. Vi har heldigvis 230 volt, som er bedre, men om 120 volt skriver Vince Galbo:
"How to wire your house for improved audio and video performance – What is the Goal?
In many cases depending on the oxidation of connections, age of the breakers, length and gauge of the wall wiring, the above wall power changes in your home system are often a bigger improvement than any component that you can buy, especially with solid state amps. But even people with tubes report improvements if not big improvements.
People often tell me “I have 20 amp dedicated lines”. By US electrical code definitions, a 20 amp dedicated line will have 12 gauge wire in the wall. So while you may have a “dedicated line”, 12 gauge wire is absolutely insufficient for high end audio systems. We are recommending ten gauge or thicker wire here. It is the subject and goal of this paper. The gauge of the wire is FAR MORE IMPORTANT than the fact that the line is “dedicated”. The subject of this paper works on the theory that the varying musical demands of your amplifier are actually modulating the incoming power line, divorced from the utility (power company) by some resistance (12 or 14 gauge wall wiring at some length from the breaker panel has too much resistance for audio purposes). The noise coming from your utility is probably much lower than you suspect and the gauge of the wire is far more important. The amp demands current up and down with the music at audio frequencies that are of course above and below the 60 cycles from the power company. These demands are impressed on the line wavering the incoming voltage and so the amp is re-ingesting its own noise and also making the line dirty for itself AND the audio front end. This is possible because the wall wiring back to the breaker panel has some degree of resistance depending on the length of the run and the wire gauge (12 gauge or sometimes even 14 gauge). Power conditioners and certain power cord designs help because they make an effort to “shunt” this noise (short it out and kill it) and consume the unwanted frequencies. A better answer is to reduce the resistance back to the breaker panel making it difficult for the amp to modulate the power at all and also at the same time getting maximum power for the amplifier power supply. And so there are two benefits to reducing the resistance back to the breaker panel.
The Main Goal – Lower Resistance
The single biggest goal in improving audio is to install heavier gauge wire using the following guide.
1 to 40 feet: 10 gauge wire
40 to 60 feet: 8 gauge wire
Over 60 feet: 6 gauge wire
Everything else in this paper is there to be sure you get the maximum benefit from the lower resistance of heavier wire! Skipping any steps is false economy."
"We are recommending ten gauge (5,2612 kvadrat) or thicker wire here.
The gauge of the wire is far more important, then the fact that the line is "dedicated".