Grounding the case significantly increases the capacitance from the lamp part of the circuit to the ground. That may really decrease starter's inductive kick amplitude, or change its distribution between lamp ends in the case of a symmetrical choke.
Also, if the ballast is really old, insulation may deteriorate, and earth leakage again can steal some starter kick energy from the lamp.
From practice, I'd say it is not normal behavior, but I mostly mess with higher voltage 230V lamp circuits.
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« Last Edit: September 19, 2024, 02:57:29 PM by RRK »
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