Code letters	Device categories	Examples
A	Assemblies	Equipment combinations amplifiers
B	Converters of non electrical variables to electrical variables	Measurement converters;sensors; microphones; photoelectric components; sound pick-ups; speakers
C	Capacitors	All types of capacitor;
D	Binary elements; delay and memory devices	Digital integrated circuits and components; delay lines;bistable elements; monostable elements; core memory;registers; magnetic tape devices; disk storage
E	Miscellaneous	Equipment not listed elsewhere such as lighting;heaters
F	Protective equipment	Fuses; releases
G	Generators	Power supply units; batteries; oscillators
H	Indicator devices	Optical and acoustic indicator devices
K	Contactors; relays	Power contactors; contactor relaysp; auxiliary;time and flasher relays
L	Inductors	Coils; throttles
M	Motors	Short circuit motor; slipring rotor motor
N	Analog components	Operational amplifiers; hybrid analog/digital elements
P	Measurement and test equipment	Displaying; recording and counting measuring equipment
Q	Circuit-breakers	Power circuit-breakers; protective circuit-breakers; miniature circuit-breakers
R	Resistors	Shunt resistors; rheostats; NTC and PTC resistors
S	Switches; selectors	Switches; end switches; control switches
T	Transformers	Power transformers; current converters
U	Modulators	Power inverters; transducers; convertersTubes;
V	semi-conductors	Vacuum tubes; gas-filled tubes; diodes; transistors;
	thyristors
W	Transmission paths;hollow conductors	Jumper wires; cables; busbars; aerials
X	Plug-and-socket devices	Terminal strips; solder tag strips; test plugs
Y	Electrically actuated mechanical devices	Magnetic valves, couplers, electric brakes
Z	Covers; filters	Cable emulations; crystal filters

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IEC IEC 60617-7,	UL/Nema	Description
Switchgear
		Knife switch
or		Normally open contact/Switch
		Switch-disconnector
		Contact closes at end of timing
		Contact opens at end of timing
		Normally closed contact
		Mechanically connected contact (to another connect)
		IEC 60 947-4.1 An integrated aux contact
		Implies adjustable
		Disconnector/ (off load switch)
		Load break switch (On load disconnector)
		Circuit breaker
		Circuit breaker isolator
		Activating coil - Relay, contactor, solenoid
		Latching relay/contactor coil. O=Energise, R=Reset,TC=Tripcoil, CC=Closing coil
		Momentary push button
		NO Latching push button
		NC latching pushbutton

Supplies

IEC	NEC/NEMA	Description
		3-phase Delta connection
417 IEC 5019		Connection point for PE conductor
		Earth
		Ground
		Battery
		Supply tranformer

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Rest to be completed...