Non invasive detection of electricity in wire

Sensors Environmental
1

hi i need a device (current sensor switch) that switches a relay when there

is no current so we know that the wire is having no electricity.

2

Can you please provide a simple sketch or example project to help illustrate your goal?

3

Thanks, so we have a gsm sms alert system that needs signal that a wire (any wire from 3-phase core) is having no current, so we can know that system is OFF or ON , there is non invasive CT on product site but dont know how to use it so that we get signal.

4

My best solution would be using a inductive approach. Something like this product: https://www.sparkfun.com/products/11005.

5

Thanks , this is what i am referring to above, but how do we integrate it in our system so we get +5v(ON) and 0v(OFF) with using simple relays (no arduino)

6

For your specific system, you may have to purchase a module and test for the range of values you seen in your operation. Once you know that you could design a simple voltage divider or more sophisticated logic triggering systems. There’s no one way I can tell you to do it.

7

Thanks a lot, can you guide me with links to use voltage dividers or any other ready to use circuits that can be integrated to audio jack of Non invasive current sensor.

8

Careful - no current flow does NOT mean that there is no voltage, or that the system is safe. Think about a blown fuse or broken wire.

/mike