Blueprint Reading & Interpretation Flashcards
7 cards from real AEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Blueprint Reading & Interpretation flashcards as text
What does a solid triangle symbol at the end of a dimension line on a blueprint indicate?
Answer: A filled arrowhead marking the extent of a dimension
A solid filled triangle at the end of a dimension line serves as an arrowhead, indicating the precise point where the dimension measurement terminates.
On an AEP electrical construction drawing, 'EGC' in a conduit schedule refers to:
Answer: Equipment Grounding Conductor
EGC stands for Equipment Grounding Conductor, the green or bare wire required by NEC to bond metal equipment enclosures to ground for safety.
On a topographic survey drawing included in a transmission line blueprint package, contour lines that are closer together indicate:
Answer: A steeper terrain with rapid elevation change
Closely spaced contour lines represent steeper terrain because the elevation changes rapidly over a short horizontal distance.
On a protection and control (P&C) blueprint, a solid line between two relay contacts with the notation 'N.O.' means:
Answer: Normally Open — the contact is open in its de-energized state
N.O. stands for Normally Open, meaning the contact gap is open when the relay coil is de-energized and closes when the relay operates.
In a substation layout drawing, equipment spacing dimensions must satisfy minimum requirements primarily governed by:
Answer: ANSI/IEEE and NESC electrical clearance standards for the operating voltage
Minimum electrical clearances in substations are governed by ANSI/IEEE standards and the National Electrical Safety Code (NESC) based on the system operating voltage.
On a one-line diagram, the designation 'CT 600:5' means:
Answer: A current transformer with a 600-amp primary to 5-amp secondary ratio
CT 600:5 indicates a current transformer that steps down 600 amperes on the primary side to 5 amperes on the secondary side for metering and protection use.
What does the note 'TYP.' on a blueprint dimension or callout mean?
Answer: The dimension or detail is Typical and applies to all similar instances
'TYP.' is an abbreviation for 'Typical,' meaning the noted dimension, detail, or specification applies to all similar or identical features on the drawing.