Allied Telesis AT-FS238a/2 - Manual (Page 48)

Translated Safety and Emission Information
36
19 CAUTION: “Safety Hazard” Check to see if there are any exposed copper
strands coming from the installed wire. When this installation is done
correctly there should be no exposed copper wire strands extending from the
terminal block. Any exposed wiring can conduct harmful levels of electricity
to persons touching the wires.