Yes, it is generally safe to touch the metal parts of a microwave oven when it is unplugged or not turned on. When a microwave oven is not plugged into an electrical outlet, there is no electricity flowing through the appliance, and therefore, there is no risk of electric shock.
However, it is still essential to practice caution and common sense:
Unplugged and Not Turned On: If the microwave is both unplugged and not turned on, the metal parts should be safe to touch. You can clean the exterior, check for any issues, or move the microwave without any concerns.
Avoid Sharp Edges: Be mindful of any sharp edges on the metal parts, especially if you are disassembling or repairing the microwave. Wear protective gloves if necessary.
Don't Tamper with Internal Components: Even when unplugged, avoid tampering with the internal components of the microwave oven. The high-voltage capacitor in a microwave can retain a charge even when unplugged, which could pose a risk if mishandled.
Plugged In or Malfunctioning: Never touch the metal parts of a microwave oven if it is plugged into an electrical outlet or if it is malfunctioning. Even if the microwave is turned off, there can still be electrical current in certain components, and touching the metal parts could lead to electric shock.
Keep Children Away: Always keep children away from appliances, including microwaves, to prevent accidents or injuries.
If you have any doubts about the safety of the microwave oven or need to perform repairs or maintenance, it's best to consult a professional technician or the manufacturer's customer service. Remember, safety should always be a top priority when dealing with any electrical appliance.