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[JeffVolp]

The interesting thing is that this ballast (both new and old) have markings stating grounding is required.

Grounding might be a safety issue to prevent a hazard if a hot lead should contact the metal case.  Or an electronic ballast could have capacitors from both AC input lines to ground to meet the FCC spec on conducted radiation.  That could cause the ground lead and a metal case to float at 60VAC if it is not grounded.

Jeff

[Brian H]

I tested three Keystone KTEB-132-1-TP-EM electronic ballasts. I had removed from new fixtures I had converted to LED Tubes.

My meters capacitor test didn't find any capacitors or it was so small it didn't go much above the resting offset {9.3 nF}, from Line or Neutral to the case ground. All three did have about a .22uF reading from Line to Neutral.
Also where labeled passes FCC part 18 must be grounded. I would guess the metal case of the ballast needed to be grounded.