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as an electrical contractor the best way to handle aluminum wiring in your home is to pig tail all aluminum wires to copper ,you should use marretts (the joiner) that are rated for this app .never use a breaker size over what the wire is rated for. a gfci are not required (at least hear) as this appliance is not considered portable (you plug it in and leave it) most gfci (for homel use)also dont like motor loads and will fail sooner.
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