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@bsdphk what do you think it is? the connectors all have a safety ground pin that presumably has to go somewhere

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Poul-Henning Kamp

@tubetime

My best idea is that it is a "neutral" intended to balance the two load-bearing circuits symmetrically around "ground" potential.

That would mean relevant but not full-load currents, which again precludes it from being also protective ground.

But I think it also has a machanical role, possibly preventing the cooling channels from collapsing during mechanical abuse.

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