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Splicing large (600 mcm) wire

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So long story short there are some 600 mcm feeders that due to settling are getting to the point of being to short. I talked with a contractor today about possibly splicing on a short piece to the end to save them. I'm just curious what would be the best option for wire this big. Big hydraulic crimp barrel? Polaris type lugs ? Old school eye barrels and tape? I don't have any knowledge of splicing this big of wire (hence bring in a contractor) but just want to learn what's out there.
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