Insulation Resistance Test Results Table

Insulation resistance test results are dependant on a number of factors such as temperature and humidity.

Insulation resistance test results table.

Recommended test voltages for routine maintenance insulation resistance tests of equipment rated to 4 160v and above. The results obtained from ir test are not intended. The insulation resistance test is an electrical test which uses a certain type and level of voltage 500v d c. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Do not touch or move conductor during testing as results will be affected. The most common voltages are 500v and 1 000v. However let s talk now about three basic types of insulation resistance tests using megger tester. 230v to measure insulation resistance in ohm s.

B kv is the rated machine terminal to terminal voltage. For good insulation the resistance usually reads in the megohm range. The measured resistance indicates the condition of the insulation between two conductive parts. For this reason care must be taken to properly prepare the cable to be tested.

For low voltage installations i e. With a little record keeping and common sense however you can get a good picture of the insulation condition from values that are only relative. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. Helps to plan for the future with respect to funding for.

As a production test this test is often used as a customer acceptance test with minimum insulation resistance per unit length often specified by the customer. The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. Why perform insulation resistance testing it s the law 33 cfr 208 10 f 1 megger tests of all insulation shall be made whenever wiring has been subjected to undue dampness and otherwise at intervals not to exceed one year. Values based on ieee std 43 2013.

Also acceptable values of insulation resistance depend upon the equipment you re testing. Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv. Insulation resistance testing path can affect the test and reduce the insulation resistance reading. Minimum acceptable insulation resistance for 600 v cable from 100 to 1000 feet.

Higher voltages are used to stress an insulation to a greater degree and thus obtain more accurate results. Do not allow the leads to touch during the test. A record shall be kept showing the results of such tests. Short time or spot reading test.

Suspend and isolate the test set leads in air as much as possible. Insulation resistance decreases in temperature or moisture.