Installation, Removal And Repairs In Hazardous Areas - Siemens S7-400 Equipment Manual

EXPLOSION HAZARD
The equipment is intended to be installed within an ultimate enclosure. The inner service
temperature of the enclosure corresponds to the ambient temperature of the module. Use
installation wiring connections with admitted maximum operating temperature of at least
30 ºC higher than maximum ambient temperature.
5.2

Installation, removal and repairs in hazardous areas

Impermissible accessories and spare parts
Risk of explosion in hazardous areas
• Only use original accessories and original spare parts.
• Observe all relevant installation and safety instructions described in the manuals for the
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,
• Close unused cable openings for electrical connections.
• Check the cables for a tight fit after installation.
Improper installation of shielded cables
There is a risk of explosion due to equalizing currents between the hazardous area and the
non-hazardous area.
• Ground shielded cables that cross hazardous areas at one end only.
• Lay a potential equalization conductor when grounding at both ends.
CP 443-1 Advanced
Equipment Manual, 03/2023, C79000-G8976-C256-07
WARNING
WARNING
device or supplied with the accessories or spare parts.
WARNING
grounding screws, etc. according to the specified torques.
WARNING
Installation, connection, commissioning, removal
5.2 Installation, removal and repairs in hazardous areas
43