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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Shielding is capacitive, not "inductive", posted by tomservo on November 7, 2006 at 07:47:07:
The ampacity rating of wire is based on very specific conditions. For a power cord, it is assumed to be in air at normal ambient room temperature and the heated air can escape by convection. When you restict the ability of heat to dissipate by wrapping the wire in a shielding material, you reduce its heat dissipating capability. But you don't reduce the upstream protection the circuit breaker offers. This can allow a wire to become significantly hotter, even dangerously hotter. If the insulation melts, there is a risk of a direct short circuit or an exposed live part. Either way it's bad news. Another common blunder is making power cords out of just about anything. Some have tried coaxial cables, and one manufacturer even tried CAT5 telephone wire. Needless to say his product wan't UL listed. These are very bad ideas no matter what they sound like. At least speaker cables and interconnects are used in power limited circuits where the worst that can usually happen is that you blow up the equipment (as when you "knit" a capacitor out of a few dozen pairs of CAT5 and hang it on the output of an audio amplifier.) But at 120 volts, you are entering a different realm of danger. What you don't know....can kill you.
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Follow Ups
- Re: Shielding is capacitive, not "inductive", - Soundmind 08:36:13 11/07/06 (0)
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