This section describes electrical hazards associated with induction heating, RF equipment, and microwave equipment used in research. The hazards are mainly associated with high-power/highfrequency RF generators, waveguides and conductors, and the working coils producing high temperatures.

10.10.4.1 HAZARDS

1. RF power as high as 50 kW and frequency in the tens of kHz range to hundreds of MHz is supplied from the RF and microwave generators. Being close to or making contact with an unprotected coil, conductors or waveguide opening may result in severe body burns.

2. Dangerous voltages are present inside the power generators.

3. Dangerous levels of RF energy may be present in the laboratory.

10.10.4.2 DESIGN AND CONSTRUCTION

1. The heating coils, sources of high-frequency energy, and other live parts outside the generator cabinet must be shielded or guarded to prevent access or contact.

2. The heating coil should have its cold (outside) lead properly grounded.

3. A coaxial cable of correct impedance and adequate construction may be desirable to deliver the RF power to the coil in order to prevent the leakage of the RF energy in the laboratory.

10.10.4.3 OPERATION AND MAINTENANCE

1. Shielding must be maintained to minimize RFMW radiation.

2. Wearing metallic objects when operating or maintaining the induction heating system is prohibited.

3. Posting suitable warnings to indicate equipment hazards.