The ballast is grounded through the plug but if you want extra protection just get a 3 prong plug and 3 wire cable (white, black, green) and connect the ground wire from your ballast to the ground in the cable. To make the wire to wire connections secure and not bulky I would solder them together and shrink wrap them then they will never come undone. You also have a guaranteed connection and the new connection is only a little fatter than the wires themselves. If you need to increase the length of the wires the heavier the gauge the less voltage drop of there is.
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