36Do not block the intake or heat dissipation openings and vents andplace the appliance beneath an extractor hood whose system must belegally compliant�It is good practice to have the periodic maintenance of the ovensperformed every year by an authorised technician and in compliancewith the specific regulations. On this occasion all controls regarding theoperation of electric components (selectors, electronics, solenoid valves,heating elements, motors, cooling fans, etc�) and the mechanical controlsrelative to functionality of the doors, hinges, closing mechanisms, andgaskets will be performed�1.3 Electric connectionAs prescribed, the electrical system must have an efficient earthsystem, as required by the regulations in force� The electrical safety ofthe appliance can only be ensured when the electrical system is conform�Before making the electrical connection, check the mains voltage andfrequency values to ensure that they conform to the requirements of theappliance, as indicated on its data plate�For direct connection to the mains, a device, sized according to theload, must be placed between the appliance and the mains itself, whichensures disconnection� Its contacts should have a minimum openingdistance that enables complete disconnection under the conditions ofcategory III overvoltage, according to installation rules; this deviceshould also be located so that it can be easily used by the operator atany time�Turn the master selector, to which the power supply plug will beconnected, to position 0 (zero)� Have the socket cable section checkedby qualified staff to make sure it suits the power absorbed by the device.The power supply cable to be used must be type H05 RN F and it mustbe the proper size for the appliance�The connection terminal board is inside the case, at the top�Pass the cable through the cable gland, connect the wires to thecorresponding terminal of the terminal board and fix them.The earth wire must be longer than the others so that, if the cableholder breaks, the earth cable detaches after the voltage cables.