Abstract: Abstract: The study on the non-standard use of patch panels has been carried out, including the winding overload use of patch panels, the dripping of liquid into the patch panels and the poor contact of plug-in sleeves. It is found that when the patch panels are used in the winding overload, the heat accumulates at the winding bend, the temperature accelerates, and the heating of the winding part is faster than that of the non-winding part; Through the comparison of dripping brine, seawater, rainwater and tap water, it is found that the electric spark generated by dripping seawater and brine is very intense; The poor contact of the insert piece and sleeve leads to the increase of the contact resistance. When the circuit is conductive, the current will flow around the larger contact resistance and discharge in the air will occur instantaneously.

Key words: Key words: patch panel, overload, brine, contact resistance, discharge