The 854 ATG housing should be properly grounded to the ground reference (generally the tank).
This is a safety grounding requirement. Grounding can be performed by copper strips across the
flanges (refer to section Grounding at mechanical installation), or by a ground wire.
With last mentioned method, use one of the external ground terminals of the 854 ATG.
Grounding shall be performed in accordance with local regulations.
Safety depends on proper grounding. Check the resistance of the ground connection
directly after installation. The measured ground resistance shall be below the maximum
When measuring the ground resistance, use a suitable explosion-proof tester.
Lay-out terminal compartment
The terminal compartment on top of the 854 ATG is divided into a non-intrinsically safe and an
intrinsically safe part. Cable entries are :@ NPT.
Location of 854 terminal compartment
The non-intrinsically safe cabling may only enter at the two right hand side cable entries (figure 7).
Only open the terminal compartment cover (top cover) when the power is switched off.
prescribed by local grounding requirements.
Installation guide 854 ATG