Twisted Pairs [RE-wrenches]

[Daryl Thayer]

Yes you are correct on AC and NO you are wrong on DC
EMF is electromotive force. 
The twisting is to eliminate the differencial mode
signals like and antenna.  The common mode signals
which effect both wires to ground there is no benifit
from twisting other than keeping the wires together.

Daryl
.   
--- Jason Fisher <jfisher at nahbrc.org> wrote:
> Good stuff guys. These issues really apply to long
> module strings on roofs.
> Talk about an attractive loop!
> 
> Question on this, in AC power, it is my
> understanding that an EMF exists
> whenever wires are energized, regardless of current
> flow. In DC power
> however, I understand that an EMF exists but does it
> only exist when there
> is current flow? Is this even close to accurate?
> If so, how does that impact the effectiveness of
> twisting DC wires to reduce
> attracting surges? Or is it really just an "antenna"
> effect we are talking
> about?
> 
> Thanks,
> 
> Jason Fisher
> 
> Aurora Energy LLC
> P.O.Box 3315
> Annapolis, MD 21403
> 
> voice / fax: 410-268-3684
> email: jason at aurora-energy.com
> 
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