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Normative references

Purpose or rationale

The normative references clause lists, for information, those documents which are cited normatively in the document.


Information on how these references apply is found in the place where they are cited in the document, and not in the normative references clause.


Normative or informative?

The normative references clause is an informative element.


The list of references it contains is given for the convenience of the user, who can then consult the place where they are cited in the document to understand and assess how they apply.


Mandatory, conditional or optional?

The normative references clause is a mandatory element, even if it contains no normative references.


Numbering and subdivision

The normative references clause shall not be subdivided.


Referenced documents listed are not numbered.


Specific principles and rules

Introductory wording

The normative references shall be introduced by the following wording:


The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.


The above wording is also applicable to a part of a multipart document.


If no references exist, include the following phrase below the clause title:


There are no normative references in this document.


Only references cited normatively in the text shall be listed in the normative references clause.




In the following case, the citation is normative and the document shall be listed in the normative references clause:


Connectors shall conform to the electrical characteristics specified by IEC 60603-7-1.


In the following case, the citation is not normative but informative. The document cited shall be listed not in the normative references clause but in the bibliography:


Wiring of these connectors should take into account the wire and cable diameter of the cables defined in IEC 61156.


Table 3 provides the verbal forms and expressions that make a citation normative.


When citing other documents, avoid using potentially ambiguous expressions, such as "see…" (which is usually employed in informative contexts). When such an expression is used, it can be unclear whether it is a requirement or a recommendation.



In the following case, the reference is informative.


For additional information on communication, see ISO 14063.


The types of document which may be referenced are given in Referencing - permitted referenced documents.


References listed may be dated or undated. See Referencing - undated references / dated references.