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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>
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