Technical Guidance Note 20
 

 

 

 

 

 

 

 

 

 

 

TOPIC: Rack systems in different configurations

ISSUE: 2

REVISION DATE: 27.1.98

PREVIOUS REVISION DATE: 29.3.95

BACKGROUND: A Manufacturer produces rack systems in many different configurations, using a range of modules. Each module complies with the appropriate EMC standards when tested in isolation.

PROBLEM:

  1. Will a system built of individually compliant modules itself be compliant?
  2. Should the TCF allow for the summation of emissions from individual modules, and if so, how?

GUIDELINES:

  1. It is not possible to guarantee that a system composed of compliant sub-assemblies will itself be compliant.
  2. Yes it should. It is up to the manufacturer to decide how this should be done and to present the evidence in the Technical Construction File. It is likely that it will be necessary to consider the design of each module and of the overall system architecture in order to decide how the combined effect of the modules should be estimated. It may not always be possible to rely on the assumption that the effects are purely additive (e.g. harmonics, flicker).
Disclaimer
No responsibility or liability can be accepted by the EMC Test Laboratories Association or any of its officers or members for the contents, specifications and/or advice referred to or contained in this Technical Memorandum and/or action taken as a result of information contained in this Technical Memorandum. Note that:
1. The Association is not by supplying this Technical Memorandum providing professional advice or guidance to any specific party on any specific matter and no legal relationship is created by the provision of this Technical Memorandum.
2. Parties should take specific advice when dealing with specific situations and consult their own professional advisors in this regard.
3. Members are free to deviate from the above guidelines where they think it appropriate, unworkable, or not commercially viable. Under these circumstances, the EMCTLA Secretariat should be informed of the reasons for the deviation so that the matter can be reviewed.

 

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