When I connect my MacBook Air to iPads through a powered USB hub the power cord for the hub explodes and trips the fuse on the building. I've tried different iPads, cords, power points to no avail.

When I connect my mac air to some iPads through a powered USB hub for VPP/Configurator, the power point for the hub blows out (tripping the fuse in the building). I've tried different iPads, cords, power points and of course hubs. Also the computer has a habit of shutting down when any type of USB device is removed from it. Does anyone have any suggestions?

I've done some experimenting, and this is what I've found out:
1) The problem persists when I reformatted the USB HDD devices to ExFAT, so the problem apparently wasn't due to NTFS for Mac OS X by Paragon.
2) The problem persists even when BackBlaze is paused, so I don't think that it's due to BackBlaze.
3) The internet cuts out as soon as data begins transferring either to or from a USB HDD device and won't reconnected until I eject and unplug the device.
4) The problem affects data transfers through either USB port.

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