Basic Impulse Level...
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Basic Impulse Level...
BIL stands for Basic Impulse Level, it is the impulse voltage or power ( in the case of testing a transformer) or surge voltage in the case of lightning or switching, that a transformer or any other electric device is able to with stand. It refers to maximum voltage a device can with stand with out insulation breakdown which leads to a short circuit.
BIL
B.I.L. stands for Basic Impulse Level for the transformer. It should be on the faceplate of the transformer.
Phase to phase clearance should be around 11.5 inches.