Power brand
Electricity marks (also lightning marks ) are injuries caused by the effects of electric current on people and are the result of electrical accidents .
Touching in the area of low-voltage a voltage-carrying part, it comes at a sufficiently high voltage and low resistance to electrical current flow through the tissue which, due to the contact resistance between the skin and the object to a strong may heat development and the associated burning may result . The reason is the high electrical power that occurs in the area of the tissue, which has a thermal effect. The duration of exposure and the specific heat capacity of the tissue, primarily dominated by water, are also important for the extent of thermal damage .
In the area of high voltage , and also with lightning, there is no direct contact with live parts with current brands, but a current flow occurs even before a possible conductor contact due to an arc fault (flashover). Since the arc is very hot, severe thermal damage suddenly occurs in the area of the current entry or exit point on the tissue. The transition resistances in the tissue and the electrical power that occurs thereon only play a subordinate role.
As a result, current marks develop in both cases: severe burns at the entry and exit points of the current in the skin.
literature
- Franz-Josef Kretz, Jürgen Schäffer: Anesthesia, intensive care medicine, emergency medicine, pain therapy . 4th edition. Springer, 2005, ISBN 978-3-540-25698-4 .