How to check continuity in a long wire. The best way to check any wire for continuity is with a tester of some type applied to each end. You can check for electrical continuity easy enough disconnect one end and short two wires together measure resistance at the other end should be close to zero. If it shows zero or some resistance in just ohms then there is short somewhere between the two wires.
It is also possible to check the continuity of a single core able using a wire tracer. If the number on the multimeter is less than 1 then your multimeter is functioning correctly. If electron flow is inhibited by broken conductors damaged components or excessive resistance the circuit is open.
Testing continuity in a very long wire find yourself a ta 312 hook it up to one end 2 separate strands and find you a teenager to hold both strands on the other end. Depending on the type of ballast you use the light may start immediately or take a few seconds to warm up to full brightness. If he starts dancing you know you are good.
But then again your readings should be as low as possible to proves that continuity exists in your long wire the circuit is complete and the switch is closed. Step 1 connect a test wire to the wire you need to identify by twisting the ends together. Then take out your long wire connect your probes to each end of it the order of placement doesnt matter you should begin to get a reading of approximately 3 ohms.
One end is a tone generator the other end is a detector that can hear those tones. Use a wire long enough to reach the other electrical box. If the wire is buried and you cannot disconnect the endsor do not want to disconnect the ends then.
When youre doing electrical wiring its easy to lose track of the wires and a continuity tester can help determine which wire goes to the switch or outlet in a nearby box. A continuity test is performed by placing a small voltage wired in series with an led or noise producing component such as a piezoelectric speaker across the chosen path. If the reading is a flat 0 thats fine too.
To test the continuity settings calibration touch the 2 terminals together and hold them in place.