Electrical Diagrams and Schematics
DOE-HDBK-1016/1-93
OBJECTIVES
TERMINAL OBJECTIVE
1.0
Given an electrical print, READ and INTERPRET facility electrical diagrams and
schematics.
ENABLING OBJECTIVES
1.1
IDENTIFY the symbols used on engineering electrical drawings for the following
components:
a.
Single-phase circuit breaker
(open/closed)
b.
Three-phase circuit breaker
(open/closed)
c.
Thermal overload
d.
"a" contact
e.
"b" contact
f.
Time-delay contacts
g.
Relay
h.
Potential transformer
i.
Current transformer
j.
Single-phase transformer
k.
Delta-wound transformer
l.
Wye-wound transformer
m.
Electric motor
n.
Meters
o.
Junctions
p.
In-line fuses
q.
Single switch
r.
Multiple-position switch
s.
Pushbutton switch
t.
Limit switches
u.
Turbine-driven generator
v.
Motor-generator set
w.
Generator (wye or delta)
x.
Diesel-driven generator
y.
Battery
1.2
Given an electrical drawing of a circuit containing a transformer, DETERMINE the
direction of current flow, as shown by the transformer's symbol.
1.3
IDENTIFY the symbols and/or codes used on engineering electrical drawings to depict
the relationship between the following components:
a.
Relay and its contacts
b.
Switch and its contacts
c.
Interlocking device and its interlocked equipment
Rev. 0
Page v
PR-03
