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MEGGER insulation Testers1NOTEST able of 2WHAT IS insulation ? ........................................ ........................................ ................ 3What Causes insulation to Degrade? ........................................ ........................................ ..... 3Electrical Stress ........................................ ........................................ .................................... 3Mechanical Stress ........................................ ........................................ ................................. 3Chemical Attack.

2 A Guide to Diagnostic Insulation Testing Above 1 kV NOTES INTRODUCTION Electrical insulation degrades over a period of time because of various stresses, which are imposed upon it during its normal working life.

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