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Points 1 and 2 seem to quite clearly prohibit that.

If you terminated the USE at an exterior junction box, before the run goes interior, and switched to a suitable wiring method (such as THWN or XHHW) that would appear to meet the wording of point 2.

More efficiently, sell off the USE to someone with an appropriate use for it, and buy XHHW or THWN for the whole run, no exterior junction box needed.

To borrow a Harper-ism, avoid the sunk-cost fallacy as you apparently have a lot of unsuitable cable for the job you should be doing with suitable wires.

But Actually

You can't use 2-2-2-4 Aluminum to feed 100A to a sub-panel. You can have a 100A sub-panel, but you can only feed it 90A on 2AWG aluminum. You only get the special exception to allow 100A on it if it's the service entrance, and that ship sailed when the power company's feeder hit the 200A main breaker outside. Everything after that is a sub-panel.

So really, sell the stuff off and buy suitable wire for the job. If you need more than 90A, that's 1 AWG aluminum.

Points 1 and 2 seem to quite clearly prohibit that.

If you terminated the USE at an exterior junction box, before the run goes interior, and switched to a suitable wiring method (such as THWN or XHHW) that would appear to meet the wording of point 2.

More efficiently, sell off the USE to someone with an appropriate use for it, and buy XHHW or THWN for the whole run, no exterior junction box needed.

To borrow a Harper-ism, avoid the sunk-cost fallacy as you apparently have a lot of unsuitable cable for the job you should be doing with suitable wires.

But Actually

You can't use 2-2-2-4 Aluminum to feed 100A to a sub-panel. You can have a 100A sub-panel, but you can only feed it 90A on 2AWG aluminum. You only get the special exception to allow 100A on it if it's the service entrance, (which is, of course, the job that Underground Service Entrance cable is made for) and that ship sailed when the power company's feeder hit the 200A main breaker outside. Everything after that is a sub-panel.

So really, sell the stuff off and buy suitable wire for the job. If you need more than 90A, that's 1 AWG aluminum.

Points 1 and 2 seem to quite clearly prohibit that.

If you terminated the USE at an exterior junction box, before the run goes interior, and switched to a suitable wiring method (such as THWN or XHHW) that would appear to meet the wording of point 2.

More efficiently, sell off the USE to someone with an appropriate use for it, and buy XHHW or THWN for the whole run, no exterior junction box needed.

To borrow a Harper-ism, avoid the sunk-cost fallacy as you apparently have a lot of unsuitable cable for the job you should be doing with suitable wires.

Points 1 and 2 seem to quite clearly prohibit that.

If you terminated the USE at an exterior junction box, before the run goes interior, and switched to a suitable wiring method (such as THWN or XHHW) that would appear to meet the wording of point 2.

More efficiently, sell off the USE to someone with an appropriate use for it, and buy XHHW or THWN for the whole run, no exterior junction box needed.

To borrow a Harper-ism, avoid the sunk-cost fallacy as you apparently have a lot of unsuitable cable for the job you should be doing with suitable wires.

But Actually

You can't use 2-2-2-4 Aluminum to feed 100A to a sub-panel. You can have a 100A sub-panel, but you can only feed it 90A on 2AWG aluminum. You only get the special exception to allow 100A on it if it's the service entrance, and that ship sailed when the power company's feeder hit the 200A main breaker outside. Everything after that is a sub-panel.

So really, sell the stuff off and buy suitable wire for the job. If you need more than 90A, that's 1 AWG aluminum.

Points 1 and 2 seem to quite clearly prohibit that.

If you terminated the USE at an exterior junction box, before the run goes interior, and switched to a suitable wiring method (such as THWN or XHHW) that would appear to meet the wording of point 2.

Points 1 and 2 seem to quite clearly prohibit that.

If you terminated the USE at an exterior junction box, before the run goes interior, and switched to a suitable wiring method (such as THWN or XHHW) that would appear to meet the wording of point 2.

More efficiently, sell off the USE to someone with an appropriate use for it, and buy XHHW or THWN for the whole run, no exterior junction box needed.

To borrow a Harper-ism, avoid the sunk-cost fallacy as you apparently have a lot of unsuitable cable for the job you should be doing with suitable wires.