• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright | Videos 

You are here: Home / Sensors and Detectors / AC Phase, Neutral, Earth Fault Indicator Circuit

AC Phase, Neutral, Earth Fault Indicator Circuit

Last Updated on July 30, 2019 by Swagatam 22 Comments

The circuit explained here will provide LED indications and show if there's a possible fault in the wiring of your home AC Phase, Neutral, and Earth connections. The idea was requested by Mr. SS kopparthy.

Technical Specifications

sir, very good morning. I thank you for your help. I further wanted you to consider a circuit whose pics are attached with links given.

This pcb would indicate me when earth is leaking(at that time the tester would burn when touched to earthing pin in 220v socket and will get a strong shock when touched by mistake.

Even the metal bodies of appliances give shock at that time.) by switching on the first two led's.if you look at the attached pics, you can see that the circuit has only a few resistors and diodes, and a black colored capacitor at back.

i also tried to draw the circuit diagram by seeing that pcb. the same pcb indicates the fuse blown condition.for circuit diagram and pictures of pcb, please see "


sir, i hope you understand the working of circuit and also hope you'll tell how its working to me also.......the purpose of writing this is that i would like you to help me by designing the circuit which has buzzer with led indication when something goes wrong. thank you very very very very very very very very much sir.........i cannot forget your help......

caution electricity can be dangerous

Using 3 LEDs for the Indications

The above circuit can be much simplified and implemented using a just three LEDs and some resistors.

The circuit may be understood as follows.

The design of the proposed LIVE or phase, neutral, earth indicator circuit is rather simple.

As can be seen in the given diagram one LED is connected across the phase/neutral, another LED across phase/earth and a third one across neutral/earth.

Each LED has its own limiting resistor rated at 56K 1 watt.

The illuminations from the LEDs in response to the different L/N/E faulty conditions could be witnessed as given under:

LED1 and LED2 ON and LED3 OFF indicates a good overall situation wherein the phase, neutral and earth could be assumed to all wired correctly.

LED2 and LED3 ON and LED1 OFF indicates a wrong polarity of phase/neutral but earth and neutral may be assumed to be rightly configured.

All three LEDs ON indicates an open earth or neutral which may be diagnosed further. Since an open neutral is rare, the possibility of an open "earth" could be considered and investigated.

In addition to the phase, neutral, earth fault indications the circuit also employs a blown fuse indicator in the form of LED4 which simply lights up if the fuse is blown or open and a appliance hooked up.

Note tat the polarity of the LEDs are not crucial and could be used any way round.

Use of red LEDs is recommended, other types could show unusual responses.

The earth leakage sensor and buzzer circuit will be soon updated.

Simplified Schematic

You'll also like:

  • 1.  IC 741 Low Battery Indicator Circuit
  • 2.  Vehicle Speed Limit Alarm Circuit
  • 3.  No Load Detector and Cut-off Circuit for Inverters
  • 4.  Transcutaneous Nerve Stimulator Circuit
  • 5.  How to Make Dog Barking Preventer Circuit using High Frequency Deterance
  • 6.  Battery Current Indicator Circuit – Current Triggered Charging Cut off

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Have Questions? Please Comment below to Solve your Queries! Comments must be Related to the above Topic!!

Subscribe
Notify of
22 Comments
Newest
Oldest
Inline Feedbacks
View all comments

Primary Sidebar

Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (26)
  • 555 IC Circuits (99)
  • 741 IC Circuits (20)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (115)
  • Battery Chargers (83)
  • Car and Motorcycle (94)
  • Datasheets (73)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (101)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (120)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (13)
  • GSM Projects (9)
  • Health Related (20)
  • Heater Controllers (29)
  • Home Electrical Circuits (103)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LED and Light Effect (93)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (66)
  • Mini Projects (149)
  • Motor Controller (67)
  • MPPT (7)
  • Oscillator Circuits (26)
  • PIR (Passive Infrared) (8)
  • Power Electronics (34)
  • Power Supply Circuits (79)
  • Radio Circuits (10)
  • Remote Control (48)
  • Security and Alarm (62)
  • Sensors and Detectors (121)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (61)
  • Timer and Delay Relay (53)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (41)
  • Ultrasonic Projects (16)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations

wpDiscuz