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Neutral
The wire in an electrical system (usually white) that carries current when there is unbalance load.
Newel
A post supporting the handrail at the top or bottom of a stairway.
Niche
A recess in a wall, usually designed to contain ornamental statues or other decorations.
Nominal Size
The size of lumber before dressing, rather than its actual size.
Nonbearing Wall
A wall supporting no load other than its own weight.
Nosing
The rounded edge of a stair treads.