Modifying a microwave oven transformer (MOT) for wood burning purposes may not be legal in the United States due to safety and regulatory concerns. Microwave oven transformers are specifically designed for powering microwave ovens, and altering or repurposing them for other uses might involve tampering with the electrical circuitry, which can be hazardous.
Additionally, the use of modified MOTs for wood burning might also raise concerns related to environmental regulations and emissions standards. Burning wood in a manner that produces excessive smoke or pollutants could potentially violate local ordinances or regulations.
To ensure compliance with the law, it is always advisable to consult local regulations and seek professional guidance from electricians or other relevant authorities before modifying or repurposing electrical equipment like microwave oven transformers.