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Joined: Oct 2000
Posts: 2,749
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Please look at this site and read some of the messages and replies and if you think that they could use some help please join and let that be known.
http://www.nachi.org/bbsystem/viewforum.php?f=24

I was especially interested in the discussion concerning a choke coil when a thermostat wire was wrapped "around" the cable or raceway to and AC unit, re 300.11(B).
http://www.nachi.org/bbsystem/viewtopic.php?t=5700

Anyway see you in about 10 days I am off to Spain, France, and Italy!!



[This message has been edited by Joe Tedesco (edited 08-01-2004).]


Joe Tedesco, NEC Consultant
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Joined: Dec 2003
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Ah, aren't there at least TWO conductors in that thermostat wire with current flowing BOTH ways? No magnetic field induced on the steel EMT so no "choke" effect.

That aside, the code prohibits wiring or a raceway from being used as a support for LV wiring so that is the reason for not doing this.

-Hal

Joined: Jul 2004
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G
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If I did this on purpose it would be to suppress common mode tranients. :-)

That is pretty common in the data world, using ferrite beads. You are right, the differential signal in the pair is not affected.


Greg Fretwell
Joined: May 2003
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e57 Offline
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Seems we take code issues a lot more seriously here on this BB than on that one.

Ignore the violations and take the topic into deep space. Chokes, ferite beads...

Maybe I'm too serious?


Mark Heller
"Well - I oughta....." -Jackie Gleason

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