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Now that the MacBook has all of its ports the same, is it possible to plug in two power cables into the Mac?

If I do so, will it charge twice as quickly? In the event that the Mac is unable to allow that amount of current in at once, is there a mechanism to limit how much is allowed in, or else cut it off entirely?

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is it possible to plug in two power cables into the Mac?

No.

The MacBook will use the charger that provides the most amount of power.

In the event that the Mac is unable to allow that amount of current in at once, is there a mechanism to limit how much is allowed in, or else cut it off entirely?

The USB 3.1 power delivery specification calls for the negotiation of charge to be delivered. If you plug more than one it, it will simply refuse the one providing the least amount of power.

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