Electrical Symbols - Chapter 7
Electrical Symbols - Chapter 7
Electrical Symbols - Chapter 7
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<strong>Chapter</strong> 7 Wire Drawings & <strong>Symbols</strong><br />
<br />
<br />
Figure 7-6 120 VAC Schematic<br />
7-2 <strong>Electrical</strong> <strong>Symbols</strong><br />
Table 7-1 <strong>Electrical</strong> <strong>Symbols</strong><br />
COMPONENT SYMBOL<br />
AMMETER<br />
BATTERY<br />
(LONG LINE IS ALWAYS POSITIVE)<br />
SINGLE CELL<br />
MULTICELL<br />
CAPACITOR<br />
FIXED<br />
POLARIZED<br />
CIRCUIT BREAKER<br />
CONTACTS<br />
CLOSED (BREAK)<br />
OPEN (BREAK)<br />
<br />
<br />
<br />
<br />
<br />
<br />
7-4 August 2006
Table 7-1 <strong>Electrical</strong> <strong>Symbols</strong><br />
COMPONENT SYMBOL<br />
CROSS, NO CONNECTION<br />
CONNECTION<br />
CONNECTION, CHASSIS (GROUND)<br />
CONNECTION, EARTH GROUND<br />
CONNECTOR<br />
DIODE, SEMICONDUCTOR<br />
FULL-WAVE, BRIDGE-TYPE<br />
RECTIFIER<br />
FUSE<br />
AC GENERATOR<br />
DC GENERATOR<br />
HEATER<br />
<br />
<br />
7-2 <strong>Electrical</strong> <strong>Symbols</strong><br />
August 2006 7-5
<strong>Chapter</strong> 7 Wire Drawings & <strong>Symbols</strong><br />
Table 7-1 <strong>Electrical</strong> <strong>Symbols</strong><br />
COMPONENT SYMBOL<br />
IGNITORS<br />
SPARK IGNITOR, GROUNDED<br />
SPARK IGNITOR, UNGROUNDED<br />
GLOW COIL; GLOW BAR; HOT WIRE<br />
INDUCTOR (COIL)<br />
INDUCTOR (SOLENOID)<br />
LAMP<br />
MOTOR, AC<br />
MOTOR, DC<br />
OHMMETER<br />
PIEZOELECTRIC<br />
CRYSTAL UNIT<br />
RELAY<br />
BASIC OPERATING COIL<br />
7-6 August 2006
Table 7-1 <strong>Electrical</strong> <strong>Symbols</strong><br />
COMPONENT SYMBOL<br />
RELAY WITH TRANSFER CONTACTS<br />
THERMAL OPERATION RELAY WITH<br />
NORMALLY OPEN CONTACTS<br />
THERMAL OPERATION RELAY WITH<br />
NORMALLY CLOSED CONTACTS<br />
RESISTOR<br />
FIXED<br />
VARIABLE<br />
SWITCHES<br />
SINGLE-POLE-SINGLE THROW (SPST)<br />
SINGLE-POLE-DOUBLE THROW (SPDT)<br />
DOUBLE-POLE-SINGLE THROW (DPST)<br />
DOUBLE-POLE-DOUBLE THROW<br />
(DPDT)<br />
PUSH BUTTON MOMENTARY NOR-<br />
MALLY CLOSED (PBNC)<br />
PUSH BUTTON MOMENTARY NOR-<br />
MALLY OPEN (PBNO)<br />
7-2 <strong>Electrical</strong> <strong>Symbols</strong><br />
August 2006 7-7
<strong>Chapter</strong> 7 Wire Drawings & <strong>Symbols</strong><br />
Table 7-1 <strong>Electrical</strong> <strong>Symbols</strong><br />
COMPONENT SYMBOL<br />
ROTARY<br />
FLOW - ACTUATED SWITCH-CLOSES<br />
ON INCREASE IN FLOW<br />
FLOW - ACTUATED SWITCH-OPEN ON<br />
INCREASE IN FLOW<br />
PRESSURE (P) - OR VACUUM (V) ACTU-<br />
ATED SWITCH, CLOSES ON RISING<br />
PRESSURE - LETTER IN SYMBOL<br />
PRESSURE (P) - OR VACUUM (V) ACTU-<br />
ATED SWITCH, OPENS ON RISING<br />
PRESSURE - LETTER IN SYMBOL<br />
TEMPERATURE - ACTUATED SWITCH<br />
CLOSES ON RISING TEMPERATURE<br />
TEMPERATURE - ACTUATED SWITCH<br />
OPENS ON RISING TEMPERATURE<br />
OPEN SWITCH WITH TIME - DELAY<br />
CLOSING (TDC) FEATURE<br />
CLOSED SWITCH WITH TIME - DELAY<br />
OPENING (TDO) FEATURE<br />
7-8 August 2006
Table 7-1 <strong>Electrical</strong> <strong>Symbols</strong><br />
COMPONENT SYMBOL<br />
TERMINAL<br />
TRANSFORMER, IRON CORE<br />
THERMISTOR<br />
THERMOELECTRIC GENERATOR<br />
SINGLE THERMOCOUPLE<br />
THERMOPILE<br />
V - VOLTMETER<br />
7-2 <strong>Electrical</strong> <strong>Symbols</strong><br />
August 2006 7-9
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