Tech Dictionary

1/C Construction

For “single conductor.”

1⁄2 RD On drawings, abbr. for Construction

Half-round .

1⁄2H Construction

On drawings, abbr. for “half-hard.”

1⁄4 RD On drawings, abbr. for Construction

Quarter-round .

1⁄4H Construction

On drawings, abbr. for “quarter-hard.”

1PH Construction

For “single phase.”

2/C Construction

For “two conductors.”

3PH Construction

For “three phase.”

45° pipe lateral Construction

A pipe fitting similar to a pipe tee except that the side opening is at a 45 ° angle.

A 1. Construction

For ampere, a unit of electric current. 2. Abbr. for area .

Å Abbr. for Construction

Angstrom .

A building Construction

Stone or brick of special shape; used at an

A-block Construction

A hollow, concrete masonry unit with one end closed and the opposite end open, having a web between, so that two cells are formed when the block is laid in a wall.

A-frame Construction

A three-piece rigid structural frame in the shape of the upright capital letter A.

A-frame house Construction

A house, usually constructed of wood, with a roof that extends steeply down- A . One or both end walls of the house are often almost completely glazed. Much ward from both sides of a central ridge, almost to rafter house . of the living area on the ground floor is open to the building foundation; the roof is supported by the underside of the roof; the bedrooms are fre- A-frame house

A-labeled door Construction

A door carrying a certification from the Underwriters’ Laboratories, Inc. that it metal, or other material. class-A door .

A-scale In Construction

Sound-level meters , a weighting net- worksurface for cladding. , widely used to measure the noise levels in buildings or communities. The A-scale provides sound concealed items (such as conduits for building pressure levels (which are also taken with a sound level meter, but without a weighting network).

A-weighted sound level Construction

The sound level light in weight to moderately heavy; frequently measured with a sound-level meter using A- weighting, which alters the sensitivity of the sound- level meter with respect to frequency so that the

A.d. Construction

For “air-dried.”

A.W.W.I. Construction

For “American Wood Window Institute.”

A/E Abbr. for Construction

Architect-engineer .

A/F Construction

In a portland cement mixture, the abbr. for “molar or weight ratio of aluminum oxide to iron process. ters protuberances, rough surfaces, and/or blunt Pressure is supplied by compressed liquefied

A/W Construction

For “all-weather.”

AA Construction

For the “Architectural Association,” the largest school of architecture in England; address 34–36 Bedford Square, London, WC1B

AAA Construction

For “Architectural Aluminum Asso- ciation.”