ELECTRICAL AND ELECTRONICS ENGINEERING DEPARTMENT
EGYPOWSYSLAB –
ASSIGNMENT
Name: William G. Buenaventura
Student No.: 201412123
Section: L51
Prof.: Engr. Victor Medina
Circuit symbols to IEC (DIN EN), NEMA
ICS/ANSI/IEEE/CSA
The following comparison of circuit symbols is based upon the following
international/national specifications:
Description IEC (DIN EN) NEMA
ICS/ANSI/IEEE
Conductors, connectors
Junction of conductors
or or
Connection of conductors (node)
Terminal
Terminal strip/block
Conductors
Conductor (for later expansion)
Line of application, general symbol
Line of application, optional, denoting small interval
Separation between two fields
Line of separation between functional units
Shielding
Earth, general symbol Ground, general symbol
Protective earth Protective ground
Connector with plug and socket
or
Isolating point, lug, closed
Passive components
Resistor, general symbol
or
or
Resistor with fixed tappings
or
Variable resistor, general
Adjustable resistor
Resistor with sliding contact, potentiometer
Winding, inductance, general
or
Winding with fixed tapping
Capacitor, general symbol
or
or
Variable capacitor
Control circuit devices
Visual indicator, general symbol
*with colour stated
Indicator light, general symbol
or or
*with colour stated
Buzzers
or
Horn, claxon
Drives
Manual operation, general use
Operated by pushing
Operated by pulling
Operated by turning
Operated by key
Operated by rollers, sensors
Stored energy mechanism, general symbol
Switch mechanism with mechanical release
Operated by motor
Emergency switch
Operated by electromagnetic overcurrent
protection
Operated by thermal overcurrent protection
Electromagnetic operation
Control by fluid level
Electromechanical, electromagnetic operating devices
Electromechanical operating device, general
symbol, relay coil, general symbol or or
× device code
letter
Operating device with special features, general
symbol or or
× device code
letter
Electromechanical operating device with On-delay
or or
× device code
letter
Electromechanical device with Off-delay
or or
× device code
letter
Electromechanical device with On- and Off-delay
or or
× device code
letter
Electromechanical device of a thermal relay
or
Contacts
N/O contact
or
or
N/C contact
or
Changeover contact with interruption
or
Early-make N/O contact of a contact assembly TC or TDC
Late-break N/C contact of a contact assembly T0 or TD0
N/O contact, delayed when closing
or
N/C contact, delayed when reclosing
or
Control devices
Push-button (not stay-put)
Spring-return switches with N/C contact, manually
operated by pushing, e.g. push-button
Spring-return switches with N/O and N/C contacts,
manually operated by pushing
Spring-return switches with latching position and
one N/O contact, manually operated by pushing
Spring-return switches with latching position and
one N/C contact, manually operated by striking
(e.g. mushroom button)
Position switches (N/O contacts)
Limit switches (N/O contacts)
Position switches (N/C contacts)
Limit switches (N/C contacts)
Spring-return switches with N/O contacts,
mechanically operated, N/O contacts closed
Spring-return switches with N/C contacts,
mechanically operated, N/C contacts open
Proximity switches (N/C contacts), actuated by the
proximity of iron
Proximity switches, inductive, N/O contacts
Proximity switches, block diagram
Under-pressure relays, N/O contacts
or
Pressure switches, N/C contact
or
Float switches, N/O contact
Float switches, N/C contact
Switchgear
Contactors (N/O contacts)
× code letter
Three-pole contactor with bimetal relay (3 thermal
elements)
× code letter
Three-pole switch-disconnector
Three-pole circuit-breaker
Three-pole breaker with switch mechanism with
three thermoelectric overcurrent releases, three
electromagnetic overcurrent releases, motor-
protective circuit-breaker
Fuse, general symbol
Transformers, current transformers
Transformers with two windings
or
Autotransformer
or
or
Current transformer
or
or
Machines
Generator
or
Motor, general symbol
or
DC motor, general symbol
AC motor, general symbol
Three-phase asynchronous motor with squirrel-
cage rotor
or
Three-phase asynchronous motor with slip-ring
rotor
Semiconductor components
Static input
Static output
Static input with negation
Static output with negation
Dynamic input, change of status from 0 to 1 (L/H)
Dynamic input with negation, change of status from
1 to 0 (H/L)
AND gate, general symbol
OR gate, general symbol
NOT gate, inverter
AND with negated output, NAND
OR with negated output, NOR
Exclusive OR gate, general
RS flip-flop
Monostable gate, cannot be triggered during the
output pulse, general symbol
Delay, variable with indication of delay values
Semiconductor diode, general symbol
Limiting diode Zener diode
Light-emitting diode (LED), general symbol
Bi-directional diode, diac
Thyristor, general symbol
PNP transistor
or
NPN transistor, in which the collector is connected
to the enclosure or
Direct motor starters, fuseless with circuit-breakers
Control circuit with fuse
Control circuit, fuseless
Protection types for electrical equipment for USA
and Canada to IEC/EN 60529 (VDE 0470 part 1)
The IP ratings quoted in the table represent a rough comparison only. A precise comparison
is not possible since the degree of protection tests and the evaluation criteria differ.
Designation of the enclosure and the protection type to:
– NFPA 70 (National Electrical Code)
– CEC (Canadian Electrical Code)
– UL 50
– CSA-C22.2 No. 94-M91 (2006)
– NEMA 250 -20031)
Comparable IP Comparable IP
protection types to protection types to
IEC/EN 60529 IEC/EN 60529
DIN 40050 DIN 40050
UL/CSA type 1 IP20 UL/CSA type 4 X IP66
General purpose dust-tight, water-
tight,corrosion-resistant,
rain-tight
UL/CSA type 2 IP22 UL/CSA type 5 IP53
Drip-tight drip-tight, dust-tight
UL/CSA type 3 IP55 UL/CSA type 6 IP67
Dust-tight, rain- rain-tight, water-tight,
tight, resistant to immersible, resistant to
sleet and ice hail and ice
UL/CSA type 3 R IP24 UL/CSA type 12 IP54
Rain-proof, For use in industry, drip-
resistant to sleet tight, dust-tight
and ice
UL/CSA type 3 S IP55 UL/CSA type 13 IP54
Dust-tight, rain- dust-tight, oil-tight, drip-
tight, resistant to tight
sleet and ice
UL/CSA type 4 IP66
dust-tight, water-
tight, rain-tight
1)
NEMA = National Electrical Manufacturers Association
Terms German/English: [t-head3]
General purpose: general purpose
tropfdicht: drip-tight
staubdicht: dust-tight
regendicht: rain-tight
regensicher: rain-proof
wettersicher: weather-proof
wasserdicht: water-tight
eintauchbar: submersible
eisbeständig: ice resistant
hagelbeständig: sleet resistant
korrosionsbeständig: corrosion
resistant
öldicht: oil-tight
