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P,
Apples & oranges. You must connect the box ground or it won't work at all. In some cases, both the box ground lead, and the box case must be grounded.
My concern was putting a ground-to-block on the coil primary- lead that should go back to the box only. Had I (or you) an internal schematic of the box, it might show that the coil primary- just goes to ground anyway, in which case having a redundant ground wouldn't hurt anything. Without an internal schematic, my gut tells me that you might be shorting out a part of the intermediate voltage (460 - 480v) circuit and damaging the box electronics. I don't know. Just sharing a concern.
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