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Are the old metal cased NSTs filled with tar? Answered

I've got an old NST and am interested in removing the shunts, before I do anything I would like to know if they (old NSTs) are filled with tar?

It is a 12kV 23mA.

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steveastrouk

Best Answer 7 years ago

Often. Heat them up in an oven and see what happens. Pour out most of the tar, then kerosene will usually shift the rest.

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rickharris

7 years ago

I would expect it to be pitch rather than Tar although that may be an academic point.

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iceng

7 years ago

Bad smell for your house and you may loose the insulating effect of the tar.