Plans Flashcards
(53 cards)
3 main electrical drawings
- Schematic
- Wire
- Single line ( Block & Riser)
What do schematic drawings show
Show how electrical circuit operates (used to design or explain electrical circuit)
What do schematic drawings show
Show how electrical circuit operates (used to design or explain electrical circuit)
What are wiring diagrams used for
Used to solve problems with circuit. More detailed version of schematic showing how components are wired up
What are single line diagrams for
Shows distribution of electrical energy with a single line
- can be combination of schematic and line diagrams
- line side/high volts shown on top line
Two types of single line diagrams
-Block diagrams (flow chart with components drawn with blocks)
- Riser diagrams ( used to show power distribution across multiple floors, used in bigger buildings to show how fire alarm/phone lines are wired/connected
What are pictorial drawings
Shows an object in the form of a picture almost like a photo with a realist view. 3 dimension profile
Three types of pictorial drawings
Oblique - 45 degree angle
Isometric - 30 degree angle
Perspective drawings
What is orthographic projection
Multiple 2D drawings of an object to show from all angles. Similar to pictorial but gives precise information about size and shape. Show in 3d in a 2d drawing (side view/top view/front view)
Lettering should always be in capitals on plans true/false
True - titles should have larger font than those used for dimensions
Define visible line
Continuous thick line- normal lines used in drawings schematic borders etc.
Define hidden line
Broken thin line
- - - - - -
Used to show objects which may be hidden from view
Define centre line
— - — - —
Thin broken lines with long and short dash. Used to locate centre of an object such as a bolt hole
Define section line
Used to indicate surface has been cut or sections to be cut
Thin lines in a row on 45degree angle
\\\
Define dimension line
<—————->
Shows exact size on different parts of an object/structure- continuous line with arrows pointing to end of line/side measuring
Define Extension line
Extend outward from both sides of point of interest- dimension lines then drawn inside extension line
<—————>
| |
Define terminators/terminal lines
Places at the ends of dimension lines to mark extremities of structure/object
Define leader lines
Used to point out locations or objects on a drawing so that dimensions can be given in another drawing
Short break lines
Wavy line drawn freehand
- used to show broken section in an object/structure
Define long break line
Like a frequency sign wave
- used to show part of structure/object removed, usually as not enough room to show it all on drawing
What are the 5 drawings in construction prints
1 Site/plot
2 plan drawings
3 elevation drawings
4 sectional drawings
5 detail drawings
What 4 major divisions are in a set of construction prints
1: architectural drawings
2: structural drawings
3: mechanical drawings
4: electrical drawings
Each of these divisions consist of
Site/plot drawing
Plan drawing
Elevation drawing
Sectional drawing
Detail drawing
What are revisions on plans
When a change is made to plans revisions are recorded top of title block on new plan
Where is scale shown
Title block
