Siemens SIMATIC NET SCALANCE M826 Operating Instructions Manual page 42

Connecting up
5.1 Safety when connecting up
Note
Protective ground
A PELV circuit contains a connection to protective ground. Without a connection to protective
ground, or in case there is a fault in the connection to the protective ground, the voltage for the
circuit is not stabilized.
Note
Minimum temperature rating of the cable to be connected to the field wiring terminals, 90 °C.
Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
EXPLOSION HAZARD
Do not press the SET button if there is a potentially explosive atmosphere.
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or combustible
atmosphere is present.
Unsuitable cables or connectors
Risk of explosion in hazardous areas
• Only use connectors that meet the requirements of the relevant type of protection.
• If necessary, tighten the connector screw connections, device fastening screws, grounding
• Close unused cable openings for electrical connections.
• Check the cables for a tight fit after installation.
42
WARNING
WARNING
WARNING
screws, etc. according to the specified torques.
Operating Instructions, 10/2022, C79000-G8976-C362-07
SCALANCE M826