[TowerTalk] Sparky Pays a Visit

[Jim Brown]

On Wed, 03 Aug 2005 11:28:18 -0700, Jim Lux wrote:

>They can add things to the concrete mix to 
>enhance the conductivity as well (used in, for instance, electric railroad 
>installations). 

In some installations, concrete very LOW conductivitity is desired. Examples are 
electric railways and sidewalk heaters, where the concrete may serve as an 
insulator. 

Jim