E+E Elektronik EE300E Series, Руководство по эксплуатации

Страница: 21 / 30

24
SICHERER BEREICH
EXPLOSIONSGEFÄHRDETER
BEREICH
Erdung der Barrieren
Zentrale Erdung
Instrument
System
Sicherheits-
barriere oder
Speisegerät
Erde CH1 + CH1 - CH2 + CH2 -
Cable cross-section
maximum 4mm²
(0.06in²)
Cable cross-section
maximum 10 mm²
(0.2in
2
)
Grounding connection channel 1
Grounding connection channel 2
Grounding connection occupied
4.5 Grounding and potential equalization
The EE300Ex must be integrated into the potential equalization to avoid hazards from electro-
static charges. It shall apply the requirements of the standards EN60079-14, EN60079-25 or
IEC60079-14, IEC60079-25. With a remote sensing probe, the probe should also be integrated
with the screw connection with a maximum of 1 MΩ in the potential equalization.
The ground conductor or the potential equalization connection must have a cross-section of
4mm²
(0.06in²)
for the external earthing. With stranded wires, the cable ends should be fitted with
suitable wire-end sleeves.
Intrinsically safe barrier ground must be less than 1 ohm.
For installation in the U.S. internal earthing should be used. The wire cross-sectional must be
in accordance with NEC Section 250.122.
The braided screen should be turned back via the plastic
insert on the cable connection. The introduction of the
plastic insert presses the braided screen onto the interior
wall of the metallic part.
1)
1)
Hazardous location
Unclassified location
Safety barrier
or power
supply unit
Instrument
System
grounding of barriers
central grounding
External grounding:
Internal grounding:
potential equalization connection