RE: Speakers and mains cable

["Keith Doxey" <ukha@xxxxxxx>]

Hi Michael,

Short answer ... NONE

Long answer....

A speaker cable is inherantly a balanced circuit as there are only two
wires
and what flows up one, flows back along the other. Any interference will
be
picked up equally by both wires and will cancel out. Also speaker
circuits
are very low impedance typically having a source impedance (the
amplifier)
of less than 1 ohm and a load impedance (the speaker) of 4-8 ohms. It
would
take a very strong magnetic field to induce anything into that.

The mains cable, if it is twin and earth, is also effectivly a balanced
cable with both live and neutral carrying equal but opposite currents.
This
means that any magnetic fields generated will cancel each other out.

However, as has been pointed out by Kevin, there should be a physical
barrier between mains and low voltage wiring. This can take the form of
a
smaller plastic conduit inside the large conduit.

HTH

Keith

  -----Original Message-----
  From: Michael Mc Aree [mailto:michael.mcaree@xxxxxxx]
  Sent: 27 December 2002 10:44
  To: ukha_d@xxxxxxx
  Subject: [ukha_d] Speakers and mains cable


  I want to run Speaker cable alongside some mains cable in a conduit
for
  about 30cm. What likely problems am I going to encounter. I will use
it
  for radio mostly but sometimes some MP3 tunes in the kitchen.

  Regards

  Michael


  http://www.automatedhome.co.uk
  Post message: ukha_d@xxxxxxx
  Subscribe:  ukha_d-subscribe@xxxxxxx
  Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
  List owner:  ukha_d-owner@xxxxxxx
  List of UKHA Groups here - http://groups.yahoo.com/group/UKHA_Grouplists/

  Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.


[Non-text portions of this message have been removed]


http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx
Subscribe:  ukha_d-subscribe@xxxxxxx
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
List owner:  ukha_d-owner@xxxxxxx
List of UKHA Groups here - http://groups.yahoo.com/group/UKHA_Grouplists/

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/



http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx
List of UKHA Groups here - http://groups.yahoo.com/group/UKHA_Grouplists/

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.