建筑电气绘图知识（Knowledge of building electrical drawing）.doc

建筑电气绘图知识（Knowledge of building electrical drawing） Building electrical design and construction drawing of basic knowledge The general provisions of the drawings. Please draw the classroom electrical equipment layout problem: the size of the lamp, the lamp socket, the switch state of the legend of the direction A symbol (a), electrical electrical diagram drawing and graphical symbols for use (a) electrical diagram drawing and graphical symbols for use (figure drawing and graphical symbols for use on electrical recording) 1, according to the graphic symbols without voltage when no external force, the original state of the drawing should be shaped symbol, no voltage. Graphic symbols according to the need to reduce or enlarge the surface layout, 2, graphical symbols according to need map layout to reduce or enlarge, but each symbol and the symbol itself proportion should remain unchanged, the proportion between symbols and symbols should remain unchanged, graphic symbols with a map on paper size the thickness of the line should be consistent. The size of the graphic symbols should be the same, the thickness of the line should be consistent. The range of graphic symbols is not mandatory, 3, symbols of the range is not mandatory, without changing the meaning of the symbols, according to the drawing layout need to rotate or mirror placement, provided, according to the drawing layout need to rotate or mirror placement, but not to the text and direction that is a multiple of 90 azimuth rotation. Not to the text and the direction of rotation of the azimuth, is a multiple of 900. (two) text symbols (records) symbols (records) The new symbols of the national standard for GB7159-87 electrical technology in the new national standard for text symbols symbols general rules for the formulation of symbols for general. The new text symbols is universal at home and abroad. Generality。 Electrical symbols in electrical engineering drawings, marked on the electrical symbols in electrical