>Generally speaking what is considered hazardous, as far as voltage, is in
the domain
of NEC, the national electrical code. This book  is availible at most of the
larger
electrical distributors, should also be availible at the University.

Low voltage or what NEC refers to as control voltages is below the 50 volt level
, I think 48volts. What is considered to be a dangerous current level is
below 5ma.

Gene P. Silvernail
Belhaven Applied Technologies