Cable Insulation Test Form

The insulation condition from values that are only relative.

Cable insulation test form.

The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. Because electrical insulation will exhibit dynamic behavior during the course of your test. The test measures the insu lation resistance between the phases and or between phase and ground. Locate the connection point of the wire or cable you want to test so you have access to the exposed conductors.

It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. It is important to guard against electric shocks and avoid equipment damage from accidental discharges. The megger insulation tester is essentially a high range resistance meter. The meggering should be carried out at initial stages before and after cable laying.

Insulation resistance testing is a non destructive test procedure. For good insulation the resistance usually reads in the megohm range. Meggering of signalling cable is done to test the continuity and insulation of the cable conductors. Clamp the alligator clip on one of the.

Either turn off the breaker or if you re testing the wiring in a piece of equipment unplug it. 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 method of measuring the insulation resistance is to test and assess the state of the isolation head and body. Low insulation of cable leads to inadvertent energisation or de energisation of circuits.

During testing all cables and wiring must be completely disconnected from any equipment. For good insulation the resistance usually reads in the megohm range. Between signal wires 2. Insulation resistance testing purpose.

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. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. A cable insulation test is basically a continuity test so the power to the circuit must be off. The insulation resistance is the resistance in ohms of wires cables and electrical equipment.

Screens shall be checked as common conductors. This type of test is a form of preventative maintenance. For maintenance purposes these tests shall be performed periodically.