Why the 2021 Revision Matters
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The standard specifies permissible deviations for linear dimensions where specific tolerances are not indicated on a drawing. This "general tolerance" approach simplifies technical drawings while maintaining strict quality control. Why the 2021 Revision Matters Below is a
: It covers the entire lifecycle of electrical installations, from initial design and material selection to construction, routine operation, and ongoing maintenance. Safety Principles or 2nd Class ).
It typically follows an "old" tolerance class system (e.g., or 2nd Class ).