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6. Protective earth connection, grounding
Ex enclosures have to be grounded in accordance with the requirements in
EN/IEC 60079-0 as well as EN/IEC 61439-1. For the electrical grounding it
must always guaranteed that all grounding cross sections are dimensioned
regarding the active nominal cross section. Metal flanges, covers, metal
plates, plugs and metal glands have to be included within the potential
equalisation!
Each terminal clamp of PE bars may accept two cables of up to 6 mm². If only
one cable is connected, this must be bent into a loop so that the terminal
clamp exerts an even contact pressure (see fig.).
With plastic enclosures special measures for electrostatic earthing according
EN/IEC 60079-0 are to be done. If no PE connection in electric way is given,
the electrostatic earthing is to be done by earthing screw within the acces-
sory kit.
Appropriate tightening torques of the grounding connections are taken into
account (see drawing and table)
Inner enclosure wall
Outside wall
Electrical grounding
6 Area greased
4
2
3
4
3
5
1
2
4
Drilling for Nyltite seal
3
2
4
12
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