a
Through the use of ____________________, it is now possible for a majority of personnel to read and understand electrical drawings from various venders, as well as, the drawings from their own utility.
Standard Terminology and Symbology
unclassified drawings:
UB
UDSC
UREL
UT
Unclassified Breaker
Unclassified Disconnect
Unclassified Relay
Unclassified Transformer
what does 5E stand for on a fuse ?
5 amp
slow blow
What shows unusual symbols used in the diagrams? It also contains general notes and other important information
Legend
how do pallet switches work?
They are mechanically connected. the A pallet switches work with the breaker, and the B pallet switches work opposite of the breaker
What does the title block contain ?
1) plant identification
2) building or area
3)sheet number
4)associated equipment
5)type of print
6)print number
what is the color conductor code ?
Black
Red
Blue
Orange
yellow
brown
__________ are the simplest of all electrical diagrams presented, which present the overall description of the circuit or system by illustrating the normal order of progression of a signal or current flow
*They do not show the accurate physical location of the components in a system*
Block Diagrams
These diagrams show all electrical connections within an enclosure. they are normally from a rear view.
Wiring Diagrams
what is another name for a schematic diagram ?
elementary diagram
what is the difference between a Peddler and a Line ?
A peddler terminates out in the field and a line goes from station to station
A diagram that indicates , by means of single lines and standard symbology, the paths, interconnections, and component parts, of an electrical circuit or system of circuits.
One Line Diagram
point to point
cable diagrams
base line diagrams
lineless diagrams
these are all types of _____________
Connection Diagrams
most useful for diagnosing and troubleshooting
elementary diagram (schematic diagram)
Explain an Auto Recloser. how do they operate on a 4.8kv circuit?
when a line is tripped, the auto recloser will close the circuit and energize after 30 seconds. if the line trips again, the auto recloser will energize the circuit after 40 seconds. the circuit will then be locked out
only _________ have terminal numbers
terminal Blocks
Drawing Sizes:
A sheet
D sheet
DR sheet
A sheet = 24"x36"
D sheet = 8.5"x11"
DR sheet = 11"x17"
differential relays show _______
power in and power out
color code identifications
orange
yellow
green
white
red
station test present
temporary
wires and cables to be removed
information
energized (do not touch)