I like the Hubbell Fargo vise connectors for service connections, but I have the same problem when doing a resi heavy-up from a 60A or 100A to 200A using 4/0 AL with the old #6 CU solid neutral/messenger utility drop. Usually no problem though when doing a 60A to 100A upgrade. The two sizes of these connectors I stock are the GA-9040, which go from #1 stranded to 4/0 on both sides and the GA-9020, which go from #6 solid to 2/0 stranded on both sides. They are apparently only listed for AL on one side [Run], but CU/AL on the other [Tap]. This isnít a problem since all the drops the POCO drops for resi services here are AL anyway. To get the customer "temporarily" connected until the POCO can get out there to install the new drop, which can be weeks or months, I usually have to add another piece of larger CU wire to double up the wire on the utility side of the connector.
These connectors arenít really cheap either though, at around $22.00 a pop with the additional cost of the plastic insulating snap-on covers for the two ungrounded conductors, but when the POCO does finally get out there, at least they will reuse these connectors, since these are exactly what they were using up until they switched to the identical Richardsí Manufacturing brand vise connectors a while back. I would probably switch to the Richardsí connectors too, but canít find a supplier for them yet.
I also stock the Polaris connectors for up to 250 KCMIL, but at $25.00 a pop, I lose sleep at night knowing the POCO will just snip and chuck them.
I have AL/CU crimps and cold shrink sleeves, but they are not cheap either and I find that swinging a crimper around up on a ladder is very awkward for me. The POCO will also cut and toss these as well, so just seems like a waste. Hubbell Fargo Connectors