Standards, Protocols and conventions in engineering and construction drawings exist to allow absolute coherence and universality across all technical graphic audiences
Technical Audiences could include, but are not limited to, the following:
Architects
Architectural technicians
Landscape Architects
Construction trades
Building/Quantity surveyors
Consultant engineers
Manufacturers
Sections are used aid clarity and understanding of drawings
Types of Sections are:
stepped section
part section
revolved section
removed section
half section
Section drawings allow an interior view or internal information to be explored in orthographic views
Tolerances are usually used in manufacture to allow for some movement in manufacturing accuracy
There are two types of tolerances:
functional
non-functional
Layers are used in architecture and construction drawings
layers are a means of splitting up vast amount of information into specific parts
Layers allow for multiple input to a drawings to allow easier sharing and multi user drawings
Standards, Protocols and Conventions reduce ambiguity
Standard, Protocols and Conventions are used by various people so they have to follow clear rules