Why gently change aluminum wiring?

Natalya asks:
Good afternoon, tell me, is it necessary to change the old aluminum wiring to copper? And what does it threaten if not changed?
The answer to the question:
Hello! Let's figure it out! The wiring is OLD, so the insulation is also OLD, with time it will crack and crumble. Also, the connections are most likely SCROLLS, which are prohibited according to the PUE. They weaken over time, begin to warm up, and then how it goes, either the contact disappears or something nearby is lit. If the contact disappears you will open the walls and spoil your repair, about the second case, I think you should not talk! It is necessary to change the wiring to copper one, all the more so according to the same PUE it is necessary to carry out electrical wiring with cables with copper conductors in reconstructed and newly built electrical installations.
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