Cable Insulation Test Form

It is important to guard against electric shocks and avoid equipment damage from accidental discharges.

Cable insulation test form.

A cable insulation test is basically a continuity test so the power to the circuit must be off. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. 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 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. During testing all cables and wiring must be completely disconnected from any equipment. The insulation resistance is the resistance in ohms of wires cables and electrical equipment. Clamp the alligator clip on one of the.

The test measures the insu lation resistance between the phases and or between phase and ground. Insulation resistance testing purpose. 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. This type of test is a form of preventative maintenance.

It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. Screens shall be checked as common conductors. Between signal wires 2. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

For maintenance purposes these tests shall be performed periodically. Meggering of signalling cable is done to test the continuity and insulation of the cable conductors. The insulation condition from values that are only relative. For good insulation the resistance usually reads in the megohm range.

Because electrical insulation will exhibit dynamic behavior during the course of your test. Either turn off the breaker or if you re testing the wiring in a piece of equipment unplug it. If the insulation resistance falls below an accepted user dictated value or falling rapidly over time then cable. 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.

For good insulation the resistance usually reads in the megohm range. Low insulation of cable leads to inadvertent energisation or de energisation of circuits. The method of measuring the insulation resistance is to test and assess the state of the isolation head and body.