Construction and Electrical Drawings Quiz

Study Notes

Title block typically includes project name, location, and owner.
Legend block usually located near the title block.
Initials of drafter, design supervisor, owner, and architect are in the title block.
Contour lines on site plans indicate property slope.
Architect's scales are advantageous for detailed architectural drawings.
Architect's scales can be more accurate for larger projects.
Architect scales typically have 12 different scales which is advantageous for different projects and scales.
12 different scales on a triangular architect's scale allows for versatility and different scales for different projects.

Key plan identifies the part of a project to which the sheet applies.
A circle with a single line crossing it indicates a range receptacle.
Symbol lists include symbols for a particular project (not all possible ones).
AFF stands for above finished floor.
Ground ring must be at least 5' (1.5 m) long for grounding electrode use.
A main bonding jumper (MBJ) must be made of copper or other corrosion resistant metal.
Purpose of bonding jumpers is to connect to the service equipment to the utility supply.

Drawing numbers are typically located within a box in the architect's title block.
Formatted as a letter and a dash (or two letters) followed by one to three numbers.
First letter indicates the discipline.
Second letter (if used) indicates subdivisions within discipline.
First number usually relates to the sheet type/floor number of building.
Subsequent numbers are usually sequential, sometimes skipped; allows changes or additions later.

Title block is usually located in the lower right corner of the sheet.
Information typically includes project name, location, owner, architect's firm, and job number.
Includes the scale of the drawing and sheet number.

To use a scale drawing, note the dimension on the drawing and convert it to the value of the scale.
For example, if a drawing shows a scale of 1/2" = 1'-0", this means that every inch on the drawing represents two feet, so a drawing distance of 3" represents an actual dimension of 6'.
Architect's scale has special markings and multiple scales to simplify drawing dimensions.
A one-inch architect's scale can have a scale of 1" = 1'.
Flat and triangular architect's scales are available.
Triangular architect's scales can be marked with 12 different scales on each edge.

Each ungrounded conductor must have overcurrent protection (fuses or circuit breakers).
Fuses and circuit breakers protect conductors and equipment.
Ground fault circuit interrupters (GFCIs) protect people.
A two-pole GFCI monitors the balance between two hot conductors and the neutral conductor.
Any imbalance above 4mA will trip the device.

Rod, pipe, and plate electrodes must be buried below the permanent moisture level.
Free of nonconductive coatings (paint, enamel).
Pipe can be driven at an angle if necessary to reach the required depth.
Minimum depth is 8 feet vertically.