TS 3343

TS 3343 is a standard about how reference lines are shown in building and civil engineering drawings. In drawing practice, reference lines are the supporting graphical elements that help readers understand position, alignment, and relationships across plans, sections, and elevations; the focus of this standard is the clear and consistent presentation of those lines on technical drawings.

The role of reference lines in technical drawings

In general technical usage, reference lines serve as line-based points of reference for dimensioning and location. In building projects, axes, edge relations, and the relative position of components are often interpreted through such references. This makes drawings easier to read across disciplines and helps reduce ambiguity during design review, coordination, and revision.

What this standard covers

The scope of the standard is the display of reference lines for building and civil engineering drawings. In other words, its concern is not the structural element itself, but how that element is related to reference lines on the drawing and how that relationship is represented. That kind of common graphical language is especially useful in project documentation.

• It applies to building and civil engineering drawings.
• It deals with the presentation of reference lines.
• It is listed as equivalent to ISO 4068:1978.
• This record is marked as a withdrawn standard.