Treads are vertical members that provide changes in elevation between two adjacent stairs.

To plan where to route wiring, electricians need to know the direction of the floor joists.

A ____ is used to indicate the centers of objects such as columns and fixtures.

A section cutting line marks the part of the drawing being cut to create a(n) ____.

When listing electrical symbols, you should not use lowercase subscript to denote a variation of standard equipment.

Balloon framing reduces lumber shrinkage problems in masonry veneer structures.

The weld all-around symbol is a small circle surrounding the intersection of the reference line and the arrow.

____ lines are used to separate the various portions of the drawing, such as the title block, revision block, and notes.

NEC stands for ____.

Spot welds are specified by their diameter.