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In Reply to: I'm not totally convinced posted by Paul Tobin on December 25, 2006 at 08:09:05:
Hi Paul,You said: "This is a different issue to providing a decently low impedance cable feed (or shielding etc). I'm using 6mm˛ cable (~9AWG) over a 12m run from the fuse panel."
Yes, I agree - and that's what I'm using ... "normal" white 6mm2 electrican's stuff which has active/neutral/earth (about 6m runs to my sources and a 12m run to my power amps).
This (as I understand it) is the normal cable for 32amp circuits - yes, you can certainly use it with 20amp MCBs (but you cannot use 32amp MCBs with 20amp cable! :-)) ) but my source for AC mains advice says the sturdier construction of the 32amp MCBs - instead of 20amp - of one particular brand of MCBs, makes them sound better. And, yes, he did actually test them out over an extended period of time - 6 different brands run in for 6 weeks each! :-))
So it's only for this "better sound" reason that I'm using 32amp MCBs ... I agree it's over-the-top in terms of current flow. But because they're MCBs (and not old-fashioned 'fuses'), I don't think I'm taking much of an additional risk in terms of fire risk.
Regards,
Follow Ups:
If the 32amp CBs are more ruggedly built (better quality switch, cable clamps etc), that could make a difference.
What brand are you using?Not sure CBs are necessarily 'safer' than fuse type breakers of the same rating. I suspect the construction and contact properties may result in better sound than a fuse type breaker. They sure are a lot more convenient to reset!
Cheers, Paul
System Details
Hi Paul,The make I intend to use is Memera - made by Eaton. They're not (readily) available in Oz ... I imported them via my UK contact. Other people have used them in Oz (so I don't believe they contravene our standards) but my electrician hasn't done the MCB upgrade yet - that's an "after the Christmas break" job!! :-))
So I'll find out in a few weeks.
Regards,
Just so you know, just because you are changing out a 20 amp breaker to a 32 amp breaker that does not mean more current, amps, will flow. It only means the breaker will withstand a continuous current flow up to 32 amps before it trips open. The amount of current flow within the circuit is solely dependent on the load connected to the circuit. The wire size and the length of the branch circuit from the electrical panel to the receptacle/s is very important.
jim
yes I'm aware of that.To summarise again ... the logical flow for my change in mains circuits is as follows:
1. 6mm2 cable is better than 2.5mm2 cable (less resistance)
2. one circuit for analogue sources and one for digital is better than just one for both
3. yes, 20amp MCBs on each circuit would be entirely adequate (which I could certainly put onto the 32amp wiring) but the 32amp MCBs are built more sturdily and I am told sound better.Regards,
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