Cable Insulation Test

A cable insulation test is basically a continuity test so the power to the circuit must be off.

Cable insulation test.

A cable insulation resistance test is a test that is performed by applying 500 v or more between the conductor and ground and measuring the resulting leakage current. For good insulation the resistance usually reads in the megohm range. Wire and cable manufacturers use the insulation resistance test to track their insulation manufacturing processes and. The insulation condition from values that are only relative.

Higher voltages are used to stress an insulation to a greater degree and thus obtain more accurate results. From 20v to 2000v. The insulation resistance test is the second test required by the electrical safety testing standards. Either turn off the breaker or if you re testing the wiring in a piece of equipment unplug it.

Locate the connection point of the wire or cable you want to test so you have access to the exposed conductors. The insulation test is combined with a short circuit test and high voltage test in dc. Whether the dielectric is good or bad to evaluate a number of test results on the same piece of equipment you have to conduct the test the same way and under the relatively same environmental parameters each and every time. An insulation resistance tester is a test instrument that measures current that leaks through the insulation into ground.

The megger insulation tester is essentially a high range resistance meter. The results obtained from ir test are not intended to be useful in finding localized defects in the insulation as in a true hipot test but rather give information on the quality of the bulk material used as the insulation. Because electrical insulation will exhibit dynamic behavior during the course of your test. Measurement of dielectric strength and detection of short.

The most common voltages are 500v and 1 000v. Recommended test voltages for routine maintenance insulation resistance tests of equipment rated to 4 160v and above. The insulation test can perform. The measured resistance indicates the condition of the insulation between two conductive parts.

Determining insulation resistances from fifty kilo ohm to two thousand mega ohm at high voltage i e. The insulation test combines several functions. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. The insulation resistance test is an electrical test which uses a certain type and level of voltage 500v d c.

Insulation resistance test. The measured resistance has to be higher than the indicated limit from the international standards.