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2

GA is short for gauge. The approved gauge for electrical conductors in the US is American Wire Gauge. There are other methods to gauge wire.


2

If it has any wire down the middle of the inner 'white' then its probably coaxial cable consisting of: center core conductor dielectric braided or foil shield outer insulation But if it only has the copper around the inner 'white' then its probably a super-flexible wire consisting of: Inner strength member (nylon/glass-fiber) braided or spiral-wound ...


7

Sounds an awful lot like coaxial cable. This is used in cable TV and rather old computer network cables. While not directly hazardous, homes with it have been statistically linked to high cable TV bills and an obsession with something called "Game of Thrones".



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