LEM Voltage Transducer

Some introducation
http://www.gmw.com/electric_current/LEM/voltage-transducers.html

Capacitor Discharging  Calculation

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capdis.html

1-Wire protocal
http://en.wikipedia.org/wiki/1-Wire

Wire Parameter Calculator

http://circuitcalculator.com/wordpress/2007/09/20/wire-parameter-calculator