Some common symbols used in wiring diagrams are:
· Switches
– Symbols for switches may vary depending on the type, but generally, they are
depicted by a rectangle, with two inputs and one output. The inputs may be
labeled with letters or numbers, such as A and B, or 1 and 2. The output may be
labeled with C or 3. The switch may also have a symbol inside the rectangle to indicate its
function, such as a line for a normally open switch, or a dot for a normally
closed switch.
· Relays – These components are usually represented by a triangle,
with three inputs and one output. The inputs may be labeled with
letters or numbers, such as A, B and C, or 1, 2 and 3. The output may be
labeled with D or 4. The relay may also have a symbol inside the triangle to indicate its
function, such as a coil for an electromagnetic relay, or a spring for a
mechanical relay.
· Batteries – These components are represented by two or more
parallel lines of different lengths. The longer line indicates the
positive terminal of the battery, while the shorter line indicates the negative
terminal. The number of lines may indicate the number of cells in the battery.
·
Resistors –
These components are represented by a zigzag line. The resistor shows the
restriction to the flow of current. The value of the resistance may be indicated by a number next to the
symbol, such as 100 ohms.
·
Lights – These components are represented by a circle with an X
inside. The light shows the emission of light when current flows
through it. The type of light may be indicated by a letter next to the symbol, such
as L for LED, F for fluorescent, or I for incandescent.
·
Motors – These components are represented by a circle with an M
inside. The motor shows the conversion of electrical energy into
mechanical energy. The direction of rotation may be indicated by an arrow next to the symbol.
·
Sensors – These components are represented by various symbols
depending on their function and type. For example, a temperature sensor may be represented by a thermometer
symbol, a pressure sensor by a gauge symbol, or a motion sensor by a radar
symbol.
These are some of the
most common symbols used in wiring diagrams, but there are many more that you
may encounter depending on the complexity and specificity of your wiring
diagram. You can always refer to the legend page of your wiring diagram to
understand what each symbol means.
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