Oracle - How to grounding the oven?

WARNING:  To avoid risk of electrical shock or death, this oven must be grounded and plug must not be altered. 

Grounding/Earthing Instructions 

The oven MUST be grounded. Grounding reduces risk of electric shock by providing a discharge wire for the electric current if an electrical short occurs. This oven is equipped with a cord which includes a grounding wire and grounding plug. The plug must be plugged into an outlet that is properly installed and grounded.

Consult a qualified electrician or service technician if grounding instructions are not clear or if there is any doubt as to whether the oven is properly grounded.

Do not use an extension cord.

If the product power cord is too short, have a qualified electrician install a socket near the oven. This oven should be plugged into a separate circuit with the electrical rating as provided in product specifications. When the combination oven is on a circuit with other equipment, an increase in cooking times may be required and fuses can be blown.

External equipotential earthing terminal

Equipment has secondary earthing terminal. Terminal provides external earthing connection used in addition to earthing prong on plug. The terminal is located on outside of oven back and marked with symbol shown on the bottom

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For versions with power cable without plug, if direct installation to the power supply network is envisaged, disconnect the line using a multi-pole switch with at least 3 mm (0.12 inches) disconnection according to Category III.