Wiring Example With Intrinsically Safe Supply Unit; Grounding And Potential Equalization - E+E Elektronik EE100Ex Installationsanleitung

2.3

Wiring Example with Intrinsically Safe Supply Unit

Fig. 3 Wiring example
2.4

Grounding and Potential Equalization

The EE100Ex must be integrated into the potential equalization in order to avoid hazards from
electrostatic charges. The standards EN60079-14, EN60079-25 or IEC60079-14, IEC60079-25
must be observed.
The cross-section of the grounding conductor or of the potential equalization connection must be
min 4 mm² (0.06 sq.in). The EE100Ex features a grounding port on the exterior of the enclosure.
With stranded wires, the cable ends should be fitted with suitable wire-end sleeves.
The resistance of the ground connection of the intrinsically safe barrier must be max. 1 ohm.
Fig. 4 Grounding and potential equalization
8
hazardous area
Systemground
non-hazardous area
intrinsically safe
supply unit
CH2
+ +
CH2
- -
CH1
+ +
CH1
- -
L+
L-
Potential equalization connection: wire cross-section ≤ 4 mm²
Internal grounding ports: wire cross-section ≤ 1.5 mm²
Controller
l
+
I = 4...20 mA
-
l
+
I = 4...20 mA
-
+
-
supply voltage
EE100Ex Safety Guide