cFMus - Special conditions

WARNING

Observe the special conditions for the intended use of Beckhoff fieldbus components in potentially explosive areas!

  • The equipment shall be installed within an enclosure that provides a minimum ingress protection of IP54 in accordance with ANSI/UL 60079-0 (US) or CSA C22.2 No. 60079-0 (Canada).
  • The equipment shall only be used in an area of at least pollution degree 2, as defined in IEC 60664-1.
  • Transient protection shall be provided that is set at a level not exceeding 140% of the peak rated voltage value at the supply terminals to the equipment.
  • The circuits shall be limited to overvoltage Category II as defined in IEC 60664-1.
  • The Fieldbus Components may only be removed or inserted when the system supply and the field supply are switched off, or when the location is known to be non-hazardous.
  • The Fieldbus Components may only be disconnected or connected when the system supply is switched off, or when the location is known to be non-hazardous.

Standards

The fundamental health and safety requirements are fulfilled by compliance with the following standards:

M20US0111X (US):

FM20CA0053X (Canada):

Marking

Beckhoff fieldbus components that are certified in accordance with cFMus for use in areas subject to an explosion hazard bear the following markings:

FM20US0111X (US):

Class I, Division 2, Groups A, B, C, D

Class I, Zone 2, AEx ec IIC T4 Gc

 

 

FM20CA0053X (Canada):

Class I, Division 2, Groups A, B, C, D

Ex ec T4 Gc