Patent ID: 7852610

Claim:
A flameproof apparatus comprising: a flameproof housing; a flameproof compliant input connection disposed through the flameproof housing to receive a wire to connect the flameproof apparatus to an external power source; a flameproof compliant output connection disposed through the flameproof housing and having a voltage source line; a voltage converter disposed within the flameproof housing and having a converter input connected to the flameproof compliant input connection and having a converter output, wherein the voltage converter converts the voltage from the external power source to a converter output voltage that is less than or equal to a predetermined maximum output voltage; and an energy limiting barrier disposed within the flameproof housing and having a barrier input operatively connected to the converter output and a barrier output operatively connected to the voltage source line, the energy limiting barrier comprising a limit circuit to limit the output voltage at the voltage source line to be less than or equal to the maximum output voltage.