Cable Insulation Test Form

The insulation resistance is the resistance in ohms of wires cables and electrical equipment.

Cable insulation test form. For maintenance purposes these tests shall be performed periodically. Screens shall be checked as common conductors. Insulation resistance testing is a non destructive test procedure. The megger insulation tester is essentially a high range resistance meter.

The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. If the insulation resistance falls below an accepted user dictated value or falling rapidly over time then cable. For good insulation the resistance usually reads in the megohm range. The method of measuring the insulation resistance is to test and assess the state of the isolation head and body.

Either turn off the breaker or if you re testing the wiring in a piece of equipment unplug it. Between signal wires 2. The test measures the insu lation resistance between the phases and or between phase and ground. Because electrical insulation will exhibit dynamic behavior during the course of your test.

Insulation resistance testing purpose. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. During testing all cables and wiring must be completely disconnected from any equipment. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Locate the connection point of the wire or cable you want to test so you have access to the exposed conductors. Clamp the alligator clip on one of the. Each core to ground continuity point to wire check with low voltage tester check correct installation of cable glands check cable identification tags check that. Maintenance insulation resistance testing can be performed on a regular basis and the collected data used to indicate if the conductor insulation is deteriorating over time.

The meggering should be carried out at initial stages before and after cable laying. 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. Meggering of signalling cable is done to test the continuity and insulation of the cable conductors. For good insulation the resistance usually reads in the megohm range.

A cable insulation test is basically a continuity test so the power to the circuit must be off. This type of test is a form of preventative maintenance. It is important to guard against electric shocks and avoid equipment damage from accidental discharges.