International Standards and Conformity Assessment for all electrical, electronic and related technologies
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Drafting IEC publications

 

 

Lists

Purpose or rationale

A list serves to subdivide information to aid understanding.

 

Title

Lists do not have a title. They may, however, be preceded by a title or introductory phrase.

 

Numbering and subdivision

Lists can be numbered or unnumbered. Lists can be subdivided.
See the examples below.

 

EXAMPLE 1

The following basic principles shall apply to the drafting of definitions.
a)   The definition shall have the same grammatical form as the term:
1)   to define a verb, a verbal phrase shall be used;
2)   to define a singular noun, the singular shall be used.
b)   The preferred structure of a definition is a basic part stating the class to which the concept belongs, and another part enumerating the characteristics that distinguish the concept from other members of the class.

 

EXAMPLE 2

No switch is required for any of the following categories of apparatus:
–    apparatus having a power consumption not exceeding 10 W under normal operating conditions;
–    apparatus having a power consumption not exceeding 50 W, measured 2 min after the application of any of the fault conditions;
–    apparatus intended for continuous operation.

 

EXAMPLE 3

Vibrations in the apparatus may be caused by
–    unbalance in the rotating elements,
–    slight deformations in the frame,
–    the rolling bearings, and
–    aerodynamic loads.

 

Referencing

The purpose of a list should be made clear by its context. For example, an introductory proposition or a subclause title can serve to introduce the list. Lists need not be specifically referred to in the text.

 

If cross-references to list items are necessary, a numbered list shall be used. Within a subdivision, each list item in a numbered list shall have a unique identifier. Numbering restarts at each new clause or subclause.

 

Use, for example, the following forms for references to lists:

  • "as specified in 3.1 b)";
  • "the requirements given in B.2 c)".