Regulation 25

for each microwave power source, a device or indicator that provides a visible indication of the status of operation of the oven;

where power can be varied by a user control, an indicator to show the level of microwave power applied to the cavity;

where a total microwave power generating capacity of 25 kW or more is used, a lock on the control panel requiring the insertion of a key before microwave power can be generated;

where access to the cavity is not by a conveyor, a door constructed and positioned so as to ensure any leakage radiation does not exceed the limits prescribed under this regulation;

a covering or baffle arrangement over any viewing screen, vent or access port in the cavity wall, other than any opening through which conveyor borne material enters or leaves the cavity, that prevents the insertion of any object into the cavity while the microwave power source is in operation;

where the oven is equipped with a door as specified in sub-paragraph (d), at least 2 electrically and mechanically independent interlocks positioned so as to ensure that —

the door cannot be opened until the microwave power generating component has been turned off; and

the microwave power generating component cannot be turned on while the door is opened;

a device to monitor one or more of the interlocks required by sub-paragraph (f) that renders the oven inoperable when a monitored interlock fails or is otherwise rendered inoperable; and

components and shields constructed and positioned so that adjustments to the service controls and user controls to yield maximum possible output do not produce leakage radiation in excess of the limits prescribed under this regulation.

the leakage radiation, measured with the instrument prescribed by paragraph (7)(b), at all points at least 5 cm from the external surface of the oven, does not exceed —

10 W/m2 with the test load prescribed by paragraph (7)(a) placed —

in the centre of the shelf in the cavity, in the case of an oven that is designed for cooking and that has a total microwave power generating capacity not greater than 1.5 kW;

as specified by the manufacturer, in the case of an oven other than an oven described in sub-paragraph (A);

50 W/m2 without a test load, where the oven is operable in such condition; and

the intensity of X-ray exposure, at 5 cm from the external surface of the oven, does not exceed 5 µSv per hour spread over an area of 10 cm2.

the test load shall be —

in the case of an oven that is designed for cooking and that has a total microwave power generating capacity not greater than 1.5 kW — 275 ± 15 ml of water at an initial temperature of 20 ± 5°C; and

in the case of an oven other than an oven described in sub-paragraph (i) — the substance and amount thereof specified by the manufacturer as the load to be used for testing the oven; and

the instrument used to measure leakage radiation shall —

be capable of measuring a power density of 10 W/m2 with an accuracy of ± 2 dB or better; and

have an indicator with a response time not greater than 3 seconds.