- [Ex ia Ga] IIА/IIВ/IIC T…; - Ex ia IIC T…Gb; - Ex ia [ia Ga] IIB Gb. T… QUESTION 2: Is the requirement for the limitation of the current through the device in normal operation to less than 10 microamperes the only requirement and surge protection devices meeting this requirement can be connected to intrinsically safe circuits? ANSWER 2: No, the requirement for the limitation of the current through the device to less than 10 microamperes in normal operation is necessary, but not sufficient to connect such devices to intrinsically safe circuits. QUESTION 3: Clause 12 IEC 60079-25:2010 states that surge protection devices shall be installed outside Zone 0. Is it permitted to assign EPL Ga to surge protection devices? ANSWER 3: No, it is not permitted assign EPL Ga to surge protection devices, as they are not intended to be installed in Zone 0 according to IEC 60079-25.
- [Ex ia Ga] IIА/IIВ/IIC T…; - Ex ia IIC T…Gb; - Ex ia [ia Ga] IIB T… Gb. QUESTION 2: Is the requirement for the limitation of the current through the device in normal operation to less than 10 microamperes the only requirement and surge protection devices meeting this requirement can be connected to intrinsically safe circuits? ANSWER 2: No, the requirement for the limitation of the current through the device to less than 10 microamperes in normal operation is necessary, but not sufficient to connect such devices to intrinsically safe circuits. QUESTION 3: Clause 12 IEC 60079-25:2010 states that surge protection devices shall be installed outside Zone 0. Is it permitted to assign EPL Ga to surge protection devices? ANSWER 3: No, it is not permitted assign EPL Ga to surge protection devices, as they are not intended to be installed in Zone 0 according to IEC 60079-25.
ExTAG_427A_CC_Compilation.docx