Bill and other knowledgable folks,

Is there any value in  running a braided shielding inside the conduit that will carry the power leads? I'm building a plane like Buly's and want to know if that's something I should just build into my electrical raceway. Thanks.

Barry Gardner
Wheaton, IL

Bill Dube wrote:

The separated power leads radiate noise quite well. They are a giant loop antenna that is transmitting any ripple on the current to the battery. Alternator whine, motor whine, ingnition system input ripple all will radiate from such a loop.

This is a very common problem on homebuilt electric vehciles. With the large battery pack, folks often fine it convienient to run the power leads up one side of the car and back on the other. The hash from the motor controller and/or the charger make it impossible to use anything electronic inside the car if you wire it that way. Sometimes, the motor controller throttle input will pick up the output hash from such a loop and make the car undrivable.

Always run power leads as a pair. Keep the "presented area" low to reduce the transmitted noise.

You have found the problem.

Twisted pair only reduces noise in signals transmitted THROUGH the wire, and it only works if the receiver uses a differential signal. It doesn't help with power wires. The curious can drop by:

http://www.duxcw.com/digest/Howto/network/cable/cable4.htm

It's a fairly good, brief description of what goes on. You'll usually only find twisted pair in LAN cabling.

Regards,
Chad

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