Drawing Layout
The drawings or blueprints used for building construction projects are drawn on sheets in various sizes.
The drawings sheet has border lines framing the overall drawing and one or more title blocks. The types and sizes of title blocks vary.
Besides the title block, these drawing sheets will also contain the following blocks:
1. Revision block
2. Approval block
Drafting Lines
There are many types of drafting lines. Varying the width of the lines or breaking the lines in some similar way gives a distinct and specific meaning to each type of line, thereby contrasting it with other types of lines.
Some of the common drafting lines are as follows:
• Light full line
• Medium full line
• Heavy full line
• Extra heavy full line
• Hidden line
• Dimension line
• Short break line
• Match line
• Secondary line
• Property line
• Extension line
• Section line
• Phantom lines
Note:
Additional lines are used to represent circuits and their related components.
Electrical Symbols
Electricians must be able to correctly read and understand electrical working drawings which include symbols and how they are used.
An electrical symbol is a figure or mark that stands for a component used in the electrical systems. In some cases, the symbols are a combination of abbreviations and pictographs.
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