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Old 27th January 2012, 04:37 PM   #21
pooge is offline pooge  United States
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Originally Posted by jackinnj View Post
I use Corcom filters -- easier than assembling the parts -- they work quite well (very well indeed). In fact, the price of a corcom filter is about what you would expect to pay if you had to assemble the parts from scratch.
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Any info on picking an appropriate Corcom for the job, i.e., for DAC vs. low level analog appliance?
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Old 27th January 2012, 04:49 PM   #22
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Quote:
Originally Posted by Juergen Knoop View Post
now he has two "live" lines, where there has only been one before, and a floating earth tied to a home power socket. That doesn't fills me with confidence.
Can't see the 'floating' bit on his schematic - that's definitely an earth symbol he's drawn. Each wire is only half as live as the previous single live wire. Works for me, I get a reduction in 50Hz leakage around 20dB by using such an arrangement.
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Old 27th January 2012, 04:50 PM   #23
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Probably the big difference is the the GFCI's are more sensitive. They trip at 5 ma. leakage rather than 30 ma. So some power conditioners on some noisy power lines that dump the noise current to the safety ground (PE, EGC) will trip the GFCI.

But my question really was, how would you mount a RCBO and RCCB breaker inside a piece of equipment? Mounting a GFCI breaker would be ugly,
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Old 27th January 2012, 04:55 PM   #24
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Pick a filter with appropriate current/wattage rating for the component/device for which it is filtering the power. Don't put a 10 A filter on a component that draws 100 W. You will get generally get better filtering from a 2 A rated filter than the 10 A one. This is mainly because the inductors can be of higher inductance on the lower current filter; on higher current filters, the inductance needs to be reduced to prevent saturation. OTOH, a physically very large 10 A filter may have much better filtering than a physically small (IEC socket sized) 2 A one. For a given size (and price range), the lower the current rating, the better the attenuation of noise. A quick scan of a manufacturer's product line data sheets or brochure will confirm this.
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Old 27th January 2012, 05:00 PM   #25
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Originally Posted by abraxalito View Post
Can't see the 'floating' bit on his schematic - that's definitely an earth symbol he's drawn.
ah, I see...but where is that earth connected to? The incoming PE seemed connected to the transformers static shield only.
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Old 27th January 2012, 05:04 PM   #26
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Originally Posted by macboy View Post
A quick scan of a manufacturer's product line data sheets or brochure will confirm this.
I wholeheartedly second your comments about picking the current rating of filter which applies to the particular unit. Worth bearing in mind that manufacturers want their filters to be shown in the best light (who wouldn't? ). That means they'll show HF attenuaton with a ground-plane earth - read clean, low inductance. In reality the HF rejection of filters is fairly sensitive to inductance in the ground lead and, naturally enough to noise carried on it. This is most especially true of filters relying on Y-caps for their effectiveness.
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Old 28th January 2012, 01:28 AM   #27
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Originally Posted by pooge View Post
Any info on picking an appropriate Corcom for the job, i.e., for DAC vs. low level analog appliance?
Check out the 6EHQ1 Corcoms. They have attenuation specs down to 10 Khz.
I use them in almost everything in my setup.
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Old 28th January 2012, 01:40 AM   #28
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http://www.corcom.com/PDF/HQ.pdf

More impressive is the 30dB typical common-mode performance at 30MHz. Looks like an excellent choice for digital kit though it would be nice to see how they get on above 30MHz.
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Old 28th January 2012, 03:38 PM   #29
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Quote:
Originally Posted by AndrewT View Post
RCBO and RCCB are mains electricity safety devices.
Residual Current Breaker means much the same as Earth Leakage Breaker.

If mains current is leaking to earth the device notices that the Live current is not the same as the Neutral current and opens the contacts to isolate the apparent fault (current leaking to earth).

These devices were not intended to be fitted to the secondary side of an isolating transformer.

Remember they measure the difference between the Live current and the Neutral current and when that difference exceeds a preset threshold the breaker opens.
Thanks AndrewT. What you're suggesting, then, is to place the RCBO before?
The secondary will be balanced (115 - 0 - 115) and I was wondering how the device would correctly on this.
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Old 28th January 2012, 03:42 PM   #30
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Originally Posted by nigelwright7557 View Post
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Thanks, I was thinking a balanced setup.
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