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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: "Break the loop, and forget the tweak stuff." DANGEROUS! posted by Al Sekela on June 24, 2007 at 09:41:53:
Al: ""
For your information, the Ebtech pro-audio device, that introduces antiparallel rectifier diodes into the AC ground, is UL-listed. ""
I can't find that on their site. I also don't see the device with UL printed on it. Where did this info come from? I would have figured they would blast that fact on the site, but I found nothing.
Al, your advice to use a low resistance choke in the ground path is indeed dangerous, and does not conform to code by itself. The impedance to ground cannot be such that it alters the clearing time of the breaker. I wouldn't want a fault which is supposed to be a magnetic clearing regime be dropped into the thermal regime..too slow.
NEC 250.4(B)(3) specifies a low impedance path for grounding, that may not occur with an unspecified choke..
I've used antiparallel diodes, but they MUST be capable of surviving intact at least 2 lobes (16 milliseconds) of 10 kiloamps. (by surviving intact, I mean, fail shorted without losing encapsulation integrity (blowed up).
Cheers, John
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Follow Ups
- RE: "Break the loop, and forget the tweak stuff." DANGEROUS! - jneutron 10:02:00 06/25/07 (2)
- Private communication from a friend who took one apart. - Al Sekela 14:57:34 06/25/07 (1)
- RE: Private communication from a friend who took one apart. - jneutron 05:52:52 06/26/07 (0)
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