Insulation Resistance Test Australian Standard

One meg ohm rule for ir value for equipment.

Insulation resistance test australian standard.

The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. Dielectric strength testing also called breakdown testing measures an insulation s ability to withstand a medium duration voltage surge without sparkover occurring. As per ie rules 1956. Insulation resistance decreases in temperature or moisture.

At a pressure of 1000 v applied between each live conductor and earth for a period of one minute the insulation resistance of hv installations shall be at least 1 mega ohm or as specified by the bureau of indian standards. 1 as nzs 3017 2001 electrical installations testing and inspection guidelines 4 preface 5 contents 6 section 1 scope and general 6 1 1 scope 6 1 2 safety 7 1 3 referenced documents 8 1 4 sequence of tests 8 1 5 failure of a test 8 1 6 test equipment 8 1 6 1 equipment checks 8 1 6 2 equipment 10 section 2 visual. 1k v 1 mω minimum 1kv 1 mω 1kv. Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv.

In reality this voltage surge may be due to lightning or the induction caused by a fault on a. Also acceptable values of insulation resistance depend upon the equipment you re testing. Testing standard for underground and overhead distribution powerlines up to and including 33kv networks. Standards australia standards new zealand australian new zealand standard electrical installations verification guidelines section 1 scope and general 1 1 scope this standard sets out some of the common inspection and test methods required to verify that a low.

Dielectric testing and insulation resistance measurement. 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.