CONTINENTAL EDISON CELED24DVDU6 Manuel D'instructions page 35

RISK OF ELECTRIC SHOCK
CAUTION: TO AVOID THE RISK OF ELECTRIC SHOCK.
DO NOT REMOVE COVER (OR BACK).
NO USER- SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
This symbol is intended to alert the user to avoid the risk
of electric shock, do not disassemble this equipment by anyone
except a qualified service personnel.
Class I structures of equipment should be connected to the grid
power output with a protective earth connection on the socket.
Power plug as a broken appliance，broken installations should
be easy to operate.
Warning
CAUTION
DO NOT OPEN
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