California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 5 - Electrical Safety Orders
Group 1 - Low-Voltage Electrical Safety Orders
Article 77.2 - Induction and Dielectric Heating Equipment
Section 2567.2 - Guarding and Grounding

(a) The converting apparatus (including the dc line) and high-frequency electric circuits (excluding the output circuits and remote-control circuits) shall be completely contained within enclosures of noncombustible material.

(b) All panel controls shall be of dead-front construction.

(c) Doors or detachable panels shall be employed for internal access. Where doors are used giving access to voltages from 500 to 600 volts ac or dc, either door locks shall be provided or interlocks shall be installed. Detachable panels not normally used for access to such parts shall be fastened in a manner that will make them difficult to remove (for example, by requiring the use of tools).

(d) Warning labels or signs that read "DANGER--HIGH VOLTAGE--KEEP OUT" shall be attached to the equipment and shall be plainly visible where persons might contact energized parts when doors are opened or closed or when panels are removed from compartments containing over 250 volts ac or dc.

(e) Induction and dielectric heating equipment shall be protected as follows:

(f) A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. The ampere rating of this disconnecting means shall not be less than the nameplate current rating of the equipment. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment.