Common DC voltage levels

DC voltage levels:

0.7V Nominal voltage drop on normal silicon diode or similar semiconductor junction

0.8V Voltages from 0V to 0.8V are considered to be logic 0 on TTL logic IC inputs

1.25V NiCd, NiMH battery cell nominal voltage

1.5V Carbon and alkaeline battery cell nominal voltage

1.6V The voltage you normally get from a fresh alkaeline battery cell

1.8V Quite commonly used very low voltage digital circuit operating voltage (many CPU cores)

2V Lead acid battery nominal cell voltage

2V Voltages from 2V to 5V are considered to be logic 1 in TTL logic IC inputs.

3V Lithium battery nominal voltage

3.3V LVTTL logic circuits operating voltage

3.6V Typical voltage used to power cell phones (either from NiMH or Li-Ion battery pack)

4.5V operating voltage for many small electronics gargets powered from three batteries

5V TTL logic circuits operating voltage

6V operating voltage for many small electronics gargets powered from four batteries

9V Commonly used battery voltage

10V Normal control voltage limit in 0-10V and 1-10V analogue control systems (light dimming and industrial use)

12V Car battery nominal voltage

13.8V the voltage you expect to get from car 12V power when car motor is running (charging battery)

24V Truck battery.
24V Automation systems most common nominal voltage used for logic signals and and current loop powering

24V common standard input voltages in Avionics and Defense applications

28V Maximum battery charging voltage for 24V battery system (for example batteries that power automation systems).

28V common standard input voltages in Avionics and Defense applications

36V Battery voltage used on some electric golf carts, electric scooters, electric bikes, high power cordless tools etc..

42.4V Voltages must be less than or equal to 42.4V peak/60V dc to meet safe limits and to be SELV.

42.4V Hazardous Voltage is a voltage exceeding 42.4V peak or 60V d.c., existing in a circuit which does not meet the requirements for either a Limited Current Circuit or a TNV Circuit.(IEC 60950)

48V Battery backed up -48V voltage is used on telecom systems for powering telephone exhanges and other telco equipment. The normal service voltage range for the -48 Vdc nominal supply at interface “A” shall be -40,5 Vdc to -57,0 Vdc according to ETSI EN 300 132-2

48V Some data centers use 48V DC to power servers (battery backup easy)

48V Phantom power feed for microphones in audio mixers most often uses +48V phantom power voltage
48V some automation systems use +48V power for equipment and I/O (electrical power distribution)

50V Work on energized circuits or apparatus below that voltage requires no “Hazard/Risk Evaluation.”     NFPA 7OE

60V Voltages must be less than or equal to 42.4V peak/60V dc to meet safe limits and to be SELV.

60V Hazardous Voltage is a voltage exceeding 42.4V peak or 60V d.c., existing in a circuit which does not meet the requirements for either a Limited Current Circuit or a TNV Circuit.(IEC 60950)

72V standard input voltage in rail applications

75V Low Voltage Directive is effective for voltages in range 50 – 1000 volts a.c. or between 75 and 1500 volts d.c

110V Seen on electrical power distribution control automation as IO voltage and for operating actuators on high voltage power distribution stations.

110V standard input voltage in rail applications

120V Extra-low voltage high limit is 120 V ripple-free d.c.

125V Commonly used insulation resistance testing voltage used for low voltage wiring testing where 250V test voltage is too much.

160V The highest DC voltage covered by the telephone/telecom/ITE industry is 160V (ANSI T1.311)

169V The peak voltage on 120V AC mains power is around 169V, you get around this voltage if you rectify and filter 120V mains power

220V Seen on electrical power distribution control automation as IO voltage and for operating actuators on high voltage power distribution stations.

250V Commonly used insulation resistance testing voltage. Tests on SELV and PELV circuits are carried out at 250 V.

270V common standard input voltages in Avionics and Defense applications

324V The peak voltage on 230V AC mains power is around 324V, you get around this voltage if you rectify and filter 230V mains power

380V DC power voltage for DC feed used on some data centers. Emerge Alliance pushes using this 380V system.

500V Commonly used insulation resistance testing voltage. Insulation tests at normal mains wiring (230V) is commonly tested with 500V test voltage. Minimum insulation resistance expected on mains circuit is 0.5 Mohm. Also test between SELV and PELV circuits and the live conductors of other circuits must be made at 500 V.

575V DC power voltage for DC feed used on some data centers

600V Voltage used on third rail powered locomotive systems and overhead lines for older trams

750V Voltage used to power trains in Helsinki subway (third rail powering) and also used in modern tram systems

1000V Commonly used insulation resistance testing voltage for circuits that operate above 500 V up to 1000 V.

1500V Low Voltage Directive is effective for voltages in range 50 – 1000 volts a.c. or between 75 and 1500 volts d.c

2500V Commonly used insulation resistance testing voltage

3250V Use 2300V rms or 3250V dc test voltage for dielectric-withstand test for double insulation

5000V Commonly used insulation resistance testing voltage when testing high voltage wiring