Ex-pert Electrical Technologies

Dynamic elaboration on the Art & Science of Hazardous Area Protection

Ex Components

What is an Ex Component ?

ex-shelf-1

Definition : An Ex component is  a part of electrical equipment or a module , marked with the symbol U, which is not intended to be used alone and requires additional consideration when incorporated into electrical equipment or systems for use in explosive atmospheres.

Examples:

Definition as per IEC 60079-0

Part of electrical equipment or a module, marked with the symbol “U”, which is not intended to
be used alone and requires additional consideration when incorporated into electrical equipment or systems for use in explosive atmospheres

As Ex Components are not intended to be used alone and require additional consideration when incorporated into electrical equipment or systems, they do not have “Specific Conditions of Use” along with the associated “X” suffix for the certificate number.
Where this standard or one of its sub-parts specify “Specific Conditions of Use” and the associated “X” suffix for the certificate number, a “Schedule of Limitations” for the Ex Component certificate and the associated “U” suffix for the Ex Component certificate number shall be substituted for an Ex Component.


The symbol “U” refers to the SUFFIX U which is marked in the Certificate Number of the Ex Component . This component certificate with theU” SUFFIX clearly shows that the reference component mentioned in the certificate is incomplete and requires further & addition considerations before putting it into an Ex equipment. This fact is elaborated in the “Schedule of Limitation “

Components

Schedule of Limitation :- Additional document included in the certificate , detailing  the additional evaluation required before putting the component into operation in a Ex Equipment.

Examples:

  • An empty Ex d Enclosure ( see Explosion proof or Flameproof  if you are planning to design your own Ex d Control station or a Junction Box )
  • An Empty Ex e enclosure
  • Post Type Bushings
  • Conductor Bushings
  • Drain & Breather Valve for conduit installations

In contrast to the Component Certificate there is The Equipment Certificate.

Equipment certificates are for the complete assemblies

Ex Bunch

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This entry was posted on December 24, 2013 by in Uncategorized.